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| <div class="section" id="mock-library-comparison"> |
| <h1>Mock Library Comparison<a class="headerlink" href="#mock-library-comparison" title="Permalink to this headline">¶</a></h1> |
| <p>A side-by-side comparison of how to accomplish some basic tasks with mock and |
| some other popular Python mocking libraries and frameworks.</p> |
| <p>These are:</p> |
| <ul class="simple"> |
| <li><a class="reference external" href="http://pypi.python.org/pypi/flexmock">flexmock</a></li> |
| <li><a class="reference external" href="http://pypi.python.org/pypi/mox">mox</a></li> |
| <li><a class="reference external" href="http://niemeyer.net/mocker">Mocker</a></li> |
| <li><a class="reference external" href="http://pypi.python.org/pypi/dingus">dingus</a></li> |
| <li><a class="reference external" href="http://pypi.python.org/pypi/fudge">fudge</a></li> |
| </ul> |
| <p>Popular python mocking frameworks not yet represented here include |
| <a class="reference external" href="http://pypi.python.org/pypi/MiniMock">MiniMock</a>.</p> |
| <p><a class="reference external" href="http://pmock.sourceforge.net/">pMock</a> (last release 2004 and doesn’t import |
| in recent versions of Python) and |
| <a class="reference external" href="http://python-mock.sourceforge.net/">python-mock</a> (last release 2005) are |
| intentionally omitted.</p> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p>A more up to date, and tested for all mock libraries (only the mock |
| examples on this page can be executed as doctests) version of this |
| comparison is maintained by Gary Bernhardt:</p> |
| <ul class="last simple"> |
| <li><a class="reference external" href="http://garybernhardt.github.com/python-mock-comparison/">Python Mock Library Comparison</a></li> |
| </ul> |
| </div> |
| <p>This comparison is by no means complete, and also may not be fully idiomatic |
| for all the libraries represented. <em>Please</em> contribute corrections, missing |
| comparisons, or comparisons for additional libraries to the <a class="reference external" href="https://code.google.com/p/mock/issues/list">mock issue |
| tracker</a>.</p> |
| <p>This comparison page was originally created by the <a class="reference external" href="https://code.google.com/p/pymox/wiki/MoxComparison">Mox project</a> and then extended for |
| <a class="reference external" href="http://has207.github.com/flexmock/compare.html">flexmock and mock</a> by |
| Herman Sheremetyev. Dingus examples written by <a class="reference external" href="http://garybernhardt.github.com/python-mock-comparison/">Gary Bernhadt</a>. fudge examples |
| provided by <a class="reference external" href="http://farmdev.com/">Kumar McMillan</a>.</p> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p>The examples tasks here were originally created by Mox which is a mocking |
| <em>framework</em> rather than a library like mock. The tasks shown naturally |
| exemplify tasks that frameworks are good at and not the ones they make |
| harder. In particular you can take a <cite>Mock</cite> or <cite>MagicMock</cite> object and use |
| it in any way you want with no up-front configuration. The same is also |
| true for Dingus.</p> |
| <p class="last">The examples for mock here assume version 0.7.0.</p> |
| </div> |
| <div class="section" id="simple-fake-object"> |
| <h2>Simple fake object<a class="headerlink" href="#simple-fake-object" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># mock</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">"calculated value"</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_attribute</span> <span class="o">=</span> <span class="s">"value"</span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">"calculated value"</span><span class="p">,</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">some_attribute</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">flexmock</span><span class="p">(</span><span class="n">some_method</span><span class="o">=</span><span class="k">lambda</span><span class="p">:</span> <span class="s">"calculated value"</span><span class="p">,</span> <span class="n">some_attribute</span><span class="o">=</span><span class="s">"value"</span><span class="p">)</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"calculated value"</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_attribute</span><span class="p">)</span> |
| |
| <span class="c"># Mox</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockAnything</span><span class="p">()</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="s">"calculated value"</span><span class="p">)</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">some_attribute</span> <span class="o">=</span> <span class="s">"value"</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">Replay</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"calculated value"</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_attribute</span><span class="p">)</span> |
| |
| <span class="c"># Mocker</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">mock</span><span class="p">()</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="s">"calculated value"</span><span class="p">)</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">replay</span><span class="p">()</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">some_attribute</span> <span class="o">=</span> <span class="s">"value"</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"calculated value"</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_attribute</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># Dingus</span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">(</span><span class="n">some_attribute</span><span class="o">=</span><span class="s">"value"</span><span class="p">,</span> |
| <span class="gp">... </span> <span class="n">some_method__returns</span><span class="o">=</span><span class="s">"calculated value"</span><span class="p">)</span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">"calculated value"</span><span class="p">,</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">some_attribute</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># fudge</span> |
| <span class="gp">>>> </span><span class="n">my_fake</span> <span class="o">=</span> <span class="p">(</span><span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">provides</span><span class="p">(</span><span class="s">'some_method'</span><span class="p">)</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">returns</span><span class="p">(</span><span class="s">"calculated value"</span><span class="p">)</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">has_attr</span><span class="p">(</span><span class="n">some_attribute</span><span class="o">=</span><span class="s">"value"</span><span class="p">))</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">"calculated value"</span><span class="p">,</span> <span class="n">my_fake</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">my_fake</span><span class="o">.</span><span class="n">some_attribute</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="simple-mock"> |
| <h2>Simple mock<a class="headerlink" href="#simple-mock" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># mock</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">"value"</span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">flexmock</span><span class="p">()</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span><span class="s">"some_method"</span><span class="p">)</span><span class="o">.</span><span class="n">and_return</span><span class="p">(</span><span class="s">"value"</span><span class="p">)</span><span class="o">.</span><span class="n">once</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| |
| <span class="c"># Mox</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockAnything</span><span class="p">()</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="s">"value"</span><span class="p">)</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">Replay</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">Verify</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span> |
| |
| <span class="c"># Mocker</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">mock</span><span class="p">()</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="s">"value"</span><span class="p">)</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">replay</span><span class="p">()</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">verify</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># Dingus</span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">(</span><span class="n">some_method__returns</span><span class="o">=</span><span class="s">"value"</span><span class="p">)</span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="gp">>>> </span><span class="k">assert</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span><span class="o">.</span><span class="n">calls</span><span class="p">()</span><span class="o">.</span><span class="n">once</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># fudge</span> |
| <span class="gp">>>> </span><span class="nd">@fudge.test</span> |
| <span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">():</span> |
| <span class="gp">... </span> <span class="n">my_fake</span> <span class="o">=</span> <span class="p">(</span><span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">'some_method'</span><span class="p">)</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">returns</span><span class="p">(</span><span class="s">"value"</span><span class="p">)</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">times_called</span><span class="p">(</span><span class="mi">1</span><span class="p">))</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="n">test</span><span class="p">()</span> |
| <span class="gt">Traceback (most recent call last):</span> |
| <span class="c">...</span> |
| <span class="gr">AssertionError</span>: <span class="n">fake:my_fake.some_method() was not called</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="creating-partial-mocks"> |
| <h2>Creating partial mocks<a class="headerlink" href="#creating-partial-mocks" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># mock</span> |
| <span class="gp">>>> </span><span class="n">SomeObject</span><span class="o">.</span><span class="n">some_method</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="s">'value'</span><span class="p">)</span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">SomeObject</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span> |
| <span class="n">flexmock</span><span class="p">(</span><span class="n">SomeObject</span><span class="p">)</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span><span class="s">"some_method"</span><span class="p">)</span><span class="o">.</span><span class="n">and_return</span><span class="p">(</span><span class="s">'value'</span><span class="p">)</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| |
| <span class="c"># Mox</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockObject</span><span class="p">(</span><span class="n">SomeObject</span><span class="p">)</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="s">"value"</span><span class="p">)</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">Replay</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">Verify</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span> |
| |
| <span class="c"># Mocker</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">mock</span><span class="p">(</span><span class="n">SomeObject</span><span class="p">)</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">Get</span><span class="p">()</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="s">"value"</span><span class="p">)</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">replay</span><span class="p">()</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">verify</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># Dingus</span> |
| <span class="gp">>>> </span><span class="nb">object</span> <span class="o">=</span> <span class="n">SomeObject</span> |
| <span class="gp">>>> </span><span class="nb">object</span><span class="o">.</span><span class="n">some_method</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="s">"value"</span><span class="p">)</span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">"value"</span><span class="p">,</span> <span class="nb">object</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># fudge</span> |
| <span class="gp">>>> </span><span class="n">fake</span> <span class="o">=</span> <span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span><span class="o">.</span><span class="n">is_callable</span><span class="p">()</span><span class="o">.</span><span class="n">returns</span><span class="p">(</span><span class="s">"<fudge-value>"</span><span class="p">)</span> |
| <span class="gp">>>> </span><span class="k">with</span> <span class="n">fudge</span><span class="o">.</span><span class="n">patched_context</span><span class="p">(</span><span class="n">SomeObject</span><span class="p">,</span> <span class="s">'some_method'</span><span class="p">,</span> <span class="n">fake</span><span class="p">):</span> |
| <span class="gp">... </span> <span class="n">s</span> <span class="o">=</span> <span class="n">SomeObject</span><span class="p">()</span> |
| <span class="gp">... </span> <span class="n">assertEqual</span><span class="p">(</span><span class="s">"<fudge-value>"</span><span class="p">,</span> <span class="n">s</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span> |
| <span class="gp">...</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="ensure-calls-are-made-in-specific-order"> |
| <h2>Ensure calls are made in specific order<a class="headerlink" href="#ensure-calls-are-made-in-specific-order" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># mock</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">(</span><span class="n">spec</span><span class="o">=</span><span class="n">SomeObject</span><span class="p">)</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span> |
| <span class="go"><Mock name='mock.method1()' id='...'></span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span> |
| <span class="go"><Mock name='mock.method2()' id='...'></span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="n">my_mock</span><span class="o">.</span><span class="n">mock_calls</span><span class="p">,</span> <span class="p">[</span><span class="n">call</span><span class="o">.</span><span class="n">method1</span><span class="p">(),</span> <span class="n">call</span><span class="o">.</span><span class="n">method2</span><span class="p">()])</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">flexmock</span><span class="p">(</span><span class="n">SomeObject</span><span class="p">)</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span><span class="s">'method1'</span><span class="p">)</span><span class="o">.</span><span class="n">once</span><span class="o">.</span><span class="n">ordered</span><span class="o">.</span><span class="n">and_return</span><span class="p">(</span><span class="s">'first thing'</span><span class="p">)</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span><span class="s">'method2'</span><span class="p">)</span><span class="o">.</span><span class="n">once</span><span class="o">.</span><span class="n">ordered</span><span class="o">.</span><span class="n">and_return</span><span class="p">(</span><span class="s">'second thing'</span><span class="p">)</span> |
| |
| <span class="c"># Mox</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockObject</span><span class="p">(</span><span class="n">SomeObject</span><span class="p">)</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="s">'first thing'</span><span class="p">)</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="s">'second thing'</span><span class="p">)</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">Replay</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">Verify</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span> |
| |
| <span class="c"># Mocker</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">mock</span><span class="p">()</span> |
| <span class="k">with</span> <span class="n">mocker</span><span class="o">.</span><span class="n">order</span><span class="p">():</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="s">'first thing'</span><span class="p">)</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="s">'second thing'</span><span class="p">)</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">replay</span><span class="p">()</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">verify</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># Dingus</span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span> |
| <span class="go"><Dingus ...></span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span> |
| <span class="go"><Dingus ...></span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">([</span><span class="s">'method1'</span><span class="p">,</span> <span class="s">'method2'</span><span class="p">],</span> <span class="p">[</span><span class="n">call</span><span class="o">.</span><span class="n">name</span> <span class="k">for</span> <span class="n">call</span> <span class="ow">in</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">calls</span><span class="p">])</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># fudge</span> |
| <span class="gp">>>> </span><span class="nd">@fudge.test</span> |
| <span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">():</span> |
| <span class="gp">... </span> <span class="n">my_fake</span> <span class="o">=</span> <span class="p">(</span><span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">remember_order</span><span class="p">()</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">'method1'</span><span class="p">)</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">'method2'</span><span class="p">))</span> |
| <span class="gp">... </span> <span class="n">my_fake</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span> |
| <span class="gp">... </span> <span class="n">my_fake</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="n">test</span><span class="p">()</span> |
| <span class="gt">Traceback (most recent call last):</span> |
| <span class="c">...</span> |
| <span class="gr">AssertionError: Call #1 was fake:my_fake.method2(); Expected</span>: <span class="n">#1 fake:my_fake.method1(), #2 fake:my_fake.method2(), end</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="raising-exceptions"> |
| <h2>Raising exceptions<a class="headerlink" href="#raising-exceptions" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># mock</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="n">SomeException</span><span class="p">(</span><span class="s">"message"</span><span class="p">)</span> |
| <span class="gp">>>> </span><span class="n">assertRaises</span><span class="p">(</span><span class="n">SomeException</span><span class="p">,</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">flexmock</span><span class="p">()</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span><span class="s">"some_method"</span><span class="p">)</span><span class="o">.</span><span class="n">and_raise</span><span class="p">(</span><span class="n">SomeException</span><span class="p">(</span><span class="s">"message"</span><span class="p">))</span> |
| <span class="n">assertRaises</span><span class="p">(</span><span class="n">SomeException</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">)</span> |
| |
| <span class="c"># Mox</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockAnything</span><span class="p">()</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span><span class="o">.</span><span class="n">AndRaise</span><span class="p">(</span><span class="n">SomeException</span><span class="p">(</span><span class="s">"message"</span><span class="p">))</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">Replay</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span> |
| <span class="n">assertRaises</span><span class="p">(</span><span class="n">SomeException</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">)</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">Verify</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span> |
| |
| <span class="c"># Mocker</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">mock</span><span class="p">()</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">throw</span><span class="p">(</span><span class="n">SomeException</span><span class="p">(</span><span class="s">"message"</span><span class="p">))</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">replay</span><span class="p">()</span> |
| <span class="n">assertRaises</span><span class="p">(</span><span class="n">SomeException</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">)</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">verify</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># Dingus</span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">exception_raiser</span><span class="p">(</span><span class="n">SomeException</span><span class="p">)</span> |
| <span class="gp">>>> </span><span class="n">assertRaises</span><span class="p">(</span><span class="n">SomeException</span><span class="p">,</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># fudge</span> |
| <span class="gp">>>> </span><span class="n">my_fake</span> <span class="o">=</span> <span class="p">(</span><span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">is_callable</span><span class="p">()</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">raises</span><span class="p">(</span><span class="n">SomeException</span><span class="p">(</span><span class="s">"message"</span><span class="p">)))</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="n">my_fake</span><span class="p">()</span> |
| <span class="gt">Traceback (most recent call last):</span> |
| <span class="c">...</span> |
| <span class="gr">SomeException</span>: <span class="n">message</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="override-new-instances-of-a-class"> |
| <h2>Override new instances of a class<a class="headerlink" href="#override-new-instances-of-a-class" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># mock</span> |
| <span class="gp">>>> </span><span class="k">with</span> <span class="n">mock</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s">'somemodule.Someclass'</span><span class="p">)</span> <span class="k">as</span> <span class="n">MockClass</span><span class="p">:</span> |
| <span class="gp">... </span> <span class="n">MockClass</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="n">some_other_object</span> |
| <span class="gp">... </span> <span class="n">assertEqual</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">,</span> <span class="n">somemodule</span><span class="o">.</span><span class="n">Someclass</span><span class="p">())</span> |
| <span class="gp">...</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span> |
| <span class="n">flexmock</span><span class="p">(</span><span class="n">some_module</span><span class="o">.</span><span class="n">SomeClass</span><span class="p">,</span> <span class="n">new_instances</span><span class="o">=</span><span class="n">some_other_object</span><span class="p">)</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">,</span> <span class="n">some_module</span><span class="o">.</span><span class="n">SomeClass</span><span class="p">())</span> |
| |
| <span class="c"># Mox</span> |
| <span class="c"># (you will probably have mox.Mox() available as self.mox in a real test)</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">Mox</span><span class="p">()</span><span class="o">.</span><span class="n">StubOutWithMock</span><span class="p">(</span><span class="n">some_module</span><span class="p">,</span> <span class="s">'SomeClass'</span><span class="p">,</span> <span class="n">use_mock_anything</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span> |
| <span class="n">some_module</span><span class="o">.</span><span class="n">SomeClass</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">)</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">ReplayAll</span><span class="p">()</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">,</span> <span class="n">some_module</span><span class="o">.</span><span class="n">SomeClass</span><span class="p">())</span> |
| |
| <span class="c"># Mocker</span> |
| <span class="n">instance</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">mock</span><span class="p">()</span> |
| <span class="n">klass</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">SomeClass</span><span class="p">,</span> <span class="n">spec</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span> |
| <span class="n">klass</span><span class="p">(</span><span class="s">'expected'</span><span class="p">,</span> <span class="s">'args'</span><span class="p">)</span> |
| <span class="n">mocker</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="n">instance</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># Dingus</span> |
| <span class="gp">>>> </span><span class="n">MockClass</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="n">some_other_object</span><span class="p">)</span> |
| <span class="gp">>>> </span><span class="k">with</span> <span class="n">dingus</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s">'somemodule.SomeClass'</span><span class="p">,</span> <span class="n">MockClass</span><span class="p">):</span> |
| <span class="gp">... </span> <span class="n">assertEqual</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">,</span> <span class="n">somemodule</span><span class="o">.</span><span class="n">SomeClass</span><span class="p">())</span> |
| <span class="gp">...</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># fudge</span> |
| <span class="gp">>>> </span><span class="nd">@fudge.patch</span><span class="p">(</span><span class="s">'somemodule.SomeClass'</span><span class="p">)</span> |
| <span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">(</span><span class="n">FakeClass</span><span class="p">):</span> |
| <span class="gp">... </span> <span class="n">FakeClass</span><span class="o">.</span><span class="n">is_callable</span><span class="p">()</span><span class="o">.</span><span class="n">returns</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">)</span> |
| <span class="gp">... </span> <span class="n">assertEqual</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">,</span> <span class="n">somemodule</span><span class="o">.</span><span class="n">SomeClass</span><span class="p">())</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="n">test</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="call-the-same-method-multiple-times"> |
| <h2>Call the same method multiple times<a class="headerlink" href="#call-the-same-method-multiple-times" title="Permalink to this headline">¶</a></h2> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">You don’t need to do <em>any</em> configuration to call <cite>mock.Mock()</cite> methods |
| multiple times. Attributes like <cite>call_count</cite>, <cite>call_args_list</cite> and |
| <cite>method_calls</cite> provide various different ways of making assertions about |
| how the mock was used.</p> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># mock</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span> |
| <span class="go"><Mock name='mock.some_method()' id='...'></span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span> |
| <span class="go"><Mock name='mock.some_method()' id='...'></span> |
| <span class="gp">>>> </span><span class="k">assert</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="o">.</span><span class="n">call_count</span> <span class="o">>=</span> <span class="mi">2</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock # (verifies that the method gets called at least twice)</span> |
| <span class="n">flexmock</span><span class="p">(</span><span class="n">some_object</span><span class="p">)</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span><span class="s">'some_method'</span><span class="p">)</span><span class="o">.</span><span class="n">at_least</span><span class="o">.</span><span class="n">twice</span> |
| |
| <span class="c"># Mox</span> |
| <span class="c"># (does not support variable number of calls, so you need to create a new entry for each explicit call)</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockObject</span><span class="p">(</span><span class="n">some_object</span><span class="p">)</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">(</span><span class="n">mox</span><span class="o">.</span><span class="n">IgnoreArg</span><span class="p">(),</span> <span class="n">mox</span><span class="o">.</span><span class="n">IgnoreArg</span><span class="p">())</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">(</span><span class="n">mox</span><span class="o">.</span><span class="n">IgnoreArg</span><span class="p">(),</span> <span class="n">mox</span><span class="o">.</span><span class="n">IgnoreArg</span><span class="p">())</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">Replay</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span> |
| <span class="n">mox</span><span class="o">.</span><span class="n">Verify</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span> |
| |
| <span class="c"># Mocker</span> |
| <span class="c"># (TODO)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># Dingus</span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span> |
| <span class="go"><Dingus ...></span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span> |
| <span class="go"><Dingus ...></span> |
| <span class="gp">>>> </span><span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">my_dingus</span><span class="o">.</span><span class="n">calls</span><span class="p">(</span><span class="s">'some_method'</span><span class="p">))</span> <span class="o">==</span> <span class="mi">2</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># fudge</span> |
| <span class="gp">>>> </span><span class="nd">@fudge.test</span> |
| <span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">():</span> |
| <span class="gp">... </span> <span class="n">my_fake</span> <span class="o">=</span> <span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span><span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">'some_method'</span><span class="p">)</span><span class="o">.</span><span class="n">times_called</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span> |
| <span class="gp">... </span> <span class="n">my_fake</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="n">test</span><span class="p">()</span> |
| <span class="gt">Traceback (most recent call last):</span> |
| <span class="c">...</span> |
| <span class="gr">AssertionError</span>: <span class="n">fake:my_fake.some_method() was called 1 time(s). Expected 2.</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="mock-chained-methods"> |
| <h2>Mock chained methods<a class="headerlink" href="#mock-chained-methods" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># mock</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="n">method3</span> <span class="o">=</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">method1</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">method2</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">method3</span> |
| <span class="gp">>>> </span><span class="n">method3</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">'some value'</span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">'some value'</span><span class="p">,</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">method3</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span> |
| <span class="gp">>>> </span><span class="n">method3</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span> |
| <span class="c"># (intermediate method calls are automatically assigned to temporary fake objects</span> |
| <span class="c"># and can be called with any arguments)</span> |
| <span class="n">flexmock</span><span class="p">(</span><span class="n">some_object</span><span class="p">)</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span> |
| <span class="s">'method1.method2.method3'</span> |
| <span class="p">)</span><span class="o">.</span><span class="n">with_args</span><span class="p">(</span><span class="n">arg1</span><span class="p">,</span> <span class="n">arg2</span><span class="p">)</span><span class="o">.</span><span class="n">and_return</span><span class="p">(</span><span class="s">'some value'</span><span class="p">)</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">'some_value'</span><span class="p">,</span> <span class="n">some_object</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">method3</span><span class="p">(</span><span class="n">arg1</span><span class="p">,</span> <span class="n">arg2</span><span class="p">))</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="c"># Mox</span> |
| <span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockObject</span><span class="p">(</span><span class="n">some_object</span><span class="p">)</span> |
| <span class="n">mock2</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockAnything</span><span class="p">()</span> |
| <span class="n">mock3</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockAnything</span><span class="p">()</span> |
| <span class="n">mock</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="n">mock1</span><span class="p">)</span> |
| <span class="n">mock2</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="n">mock2</span><span class="p">)</span> |
| <span class="n">mock3</span><span class="o">.</span><span class="n">method3</span><span class="p">(</span><span class="n">arg1</span><span class="p">,</span> <span class="n">arg2</span><span class="p">)</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="s">'some_value'</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">mox</span><span class="o">.</span><span class="n">ReplayAll</span><span class="p">()</span> |
| <span class="n">assertEqual</span><span class="p">(</span><span class="s">"some_value"</span><span class="p">,</span> <span class="n">some_object</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">method3</span><span class="p">(</span><span class="n">arg1</span><span class="p">,</span> <span class="n">arg2</span><span class="p">))</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">mox</span><span class="o">.</span><span class="n">VerifyAll</span><span class="p">()</span> |
| |
| <span class="c"># Mocker</span> |
| <span class="c"># (TODO)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># Dingus</span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="n">method3</span> <span class="o">=</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">method1</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">method2</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">method3</span> |
| <span class="gp">>>> </span><span class="n">method3</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">'some value'</span> |
| <span class="gp">>>> </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">'some value'</span><span class="p">,</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">method3</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span> |
| <span class="gp">>>> </span><span class="k">assert</span> <span class="n">method3</span><span class="o">.</span><span class="n">calls</span><span class="p">(</span><span class="s">'()'</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span><span class="o">.</span><span class="n">once</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># fudge</span> |
| <span class="gp">>>> </span><span class="nd">@fudge.test</span> |
| <span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">():</span> |
| <span class="gp">... </span> <span class="n">my_fake</span> <span class="o">=</span> <span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span> |
| <span class="gp">... </span> <span class="p">(</span><span class="n">my_fake</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">'method1'</span><span class="p">)</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">returns_fake</span><span class="p">()</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">'method2'</span><span class="p">)</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">returns_fake</span><span class="p">()</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">'method3'</span><span class="p">)</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">with_args</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span> |
| <span class="gp">... </span> <span class="o">.</span><span class="n">returns</span><span class="p">(</span><span class="s">'some value'</span><span class="p">))</span> |
| <span class="gp">... </span> <span class="n">assertEqual</span><span class="p">(</span><span class="s">'some value'</span><span class="p">,</span> <span class="n">my_fake</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">method3</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="n">test</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="mocking-a-context-manager"> |
| <h2>Mocking a context manager<a class="headerlink" href="#mocking-a-context-manager" title="Permalink to this headline">¶</a></h2> |
| <p>Examples for mock, Dingus and fudge only (so far):</p> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># mock</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">MagicMock</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="k">with</span> <span class="n">my_mock</span><span class="p">:</span> |
| <span class="gp">... </span> <span class="k">pass</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">__enter__</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">__exit__</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="bp">None</span><span class="p">,</span> <span class="bp">None</span><span class="p">,</span> <span class="bp">None</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># Dingus (nothing special here; all dinguses are "magic mocks")</span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="k">with</span> <span class="n">my_dingus</span><span class="p">:</span> |
| <span class="gp">... </span> <span class="k">pass</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="k">assert</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">__enter__</span><span class="o">.</span><span class="n">calls</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="k">assert</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">__exit__</span><span class="o">.</span><span class="n">calls</span><span class="p">(</span><span class="s">'()'</span><span class="p">,</span> <span class="bp">None</span><span class="p">,</span> <span class="bp">None</span><span class="p">,</span> <span class="bp">None</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># fudge</span> |
| <span class="gp">>>> </span><span class="n">my_fake</span> <span class="o">=</span> <span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span><span class="o">.</span><span class="n">provides</span><span class="p">(</span><span class="s">'__enter__'</span><span class="p">)</span><span class="o">.</span><span class="n">provides</span><span class="p">(</span><span class="s">'__exit__'</span><span class="p">)</span> |
| <span class="gp">>>> </span><span class="k">with</span> <span class="n">my_fake</span><span class="p">:</span> |
| <span class="gp">... </span> <span class="k">pass</span> |
| <span class="gp">...</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="mocking-the-builtin-open-used-as-a-context-manager"> |
| <h2>Mocking the builtin open used as a context manager<a class="headerlink" href="#mocking-the-builtin-open-used-as-a-context-manager" title="Permalink to this headline">¶</a></h2> |
| <p>Example for mock only (so far):</p> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># mock</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">MagicMock</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="k">with</span> <span class="n">mock</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s">'__builtin__.open'</span><span class="p">,</span> <span class="n">my_mock</span><span class="p">):</span> |
| <span class="gp">... </span> <span class="n">manager</span> <span class="o">=</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">__enter__</span><span class="o">.</span><span class="n">return_value</span> |
| <span class="gp">... </span> <span class="n">manager</span><span class="o">.</span><span class="n">read</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">'some data'</span> |
| <span class="gp">... </span> <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s">'foo'</span><span class="p">)</span> <span class="k">as</span> <span class="n">h</span><span class="p">:</span> |
| <span class="gp">... </span> <span class="n">data</span> <span class="o">=</span> <span class="n">h</span><span class="o">.</span><span class="n">read</span><span class="p">()</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="n">data</span> |
| <span class="go">'some data'</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="s">'foo'</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p><em>or</em>:</p> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># mock</span> |
| <span class="gp">>>> </span><span class="k">with</span> <span class="n">mock</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s">'__builtin__.open'</span><span class="p">)</span> <span class="k">as</span> <span class="n">my_mock</span><span class="p">:</span> |
| <span class="gp">... </span> <span class="n">my_mock</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">__enter__</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">s</span><span class="p">:</span> <span class="n">s</span> |
| <span class="gp">... </span> <span class="n">my_mock</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">__exit__</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">()</span> |
| <span class="gp">... </span> <span class="n">my_mock</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">read</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">'some data'</span> |
| <span class="gp">... </span> <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s">'foo'</span><span class="p">)</span> <span class="k">as</span> <span class="n">h</span><span class="p">:</span> |
| <span class="gp">... </span> <span class="n">data</span> <span class="o">=</span> <span class="n">h</span><span class="o">.</span><span class="n">read</span><span class="p">()</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="n">data</span> |
| <span class="go">'some data'</span> |
| <span class="gp">>>> </span><span class="n">my_mock</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="s">'foo'</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># Dingus</span> |
| <span class="gp">>>> </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">()</span> |
| <span class="gp">>>> </span><span class="k">with</span> <span class="n">dingus</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s">'__builtin__.open'</span><span class="p">,</span> <span class="n">my_dingus</span><span class="p">):</span> |
| <span class="gp">... </span> <span class="n">file_</span> <span class="o">=</span> <span class="nb">open</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">__enter__</span><span class="o">.</span><span class="n">return_value</span> |
| <span class="gp">... </span> <span class="n">file_</span><span class="o">.</span><span class="n">read</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">'some data'</span> |
| <span class="gp">... </span> <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s">'foo'</span><span class="p">)</span> <span class="k">as</span> <span class="n">h</span><span class="p">:</span> |
| <span class="gp">... </span> <span class="n">data</span> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">read</span><span class="p">()</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="n">data</span> |
| <span class="go">'some data'</span> |
| <span class="gp">>>> </span><span class="k">assert</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">calls</span><span class="p">(</span><span class="s">'()'</span><span class="p">,</span> <span class="s">'foo'</span><span class="p">)</span><span class="o">.</span><span class="n">once</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># fudge</span> |
| <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">contextlib</span> <span class="kn">import</span> <span class="n">contextmanager</span> |
| <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">StringIO</span> <span class="kn">import</span> <span class="n">StringIO</span> |
| <span class="gp">>>> </span><span class="nd">@contextmanager</span> |
| <span class="gp">... </span><span class="k">def</span> <span class="nf">fake_file</span><span class="p">(</span><span class="n">filename</span><span class="p">):</span> |
| <span class="gp">... </span> <span class="k">yield</span> <span class="n">StringIO</span><span class="p">(</span><span class="s">'sekrets'</span><span class="p">)</span> |
| <span class="gp">...</span> |
| <span class="gp">>>> </span><span class="k">with</span> <span class="n">fudge</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s">'__builtin__.open'</span><span class="p">)</span> <span class="k">as</span> <span class="n">fake_open</span><span class="p">:</span> |
| <span class="gp">... </span> <span class="n">fake_open</span><span class="o">.</span><span class="n">is_callable</span><span class="p">()</span><span class="o">.</span><span class="n">calls</span><span class="p">(</span><span class="n">fake_file</span><span class="p">)</span> |
| <span class="gp">... </span> <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s">'/etc/password'</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span> |
| <span class="gp">... </span> <span class="n">data</span> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">read</span><span class="p">()</span> |
| <span class="gp">...</span> |
| <span class="go">fake:__builtin__.open</span> |
| <span class="gp">>>> </span><span class="n">data</span> |
| <span class="go">'sekrets'</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
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| <li><a class="reference internal" href="#">Mock Library Comparison</a><ul> |
| <li><a class="reference internal" href="#simple-fake-object">Simple fake object</a></li> |
| <li><a class="reference internal" href="#simple-mock">Simple mock</a></li> |
| <li><a class="reference internal" href="#creating-partial-mocks">Creating partial mocks</a></li> |
| <li><a class="reference internal" href="#ensure-calls-are-made-in-specific-order">Ensure calls are made in specific order</a></li> |
| <li><a class="reference internal" href="#raising-exceptions">Raising exceptions</a></li> |
| <li><a class="reference internal" href="#override-new-instances-of-a-class">Override new instances of a class</a></li> |
| <li><a class="reference internal" href="#call-the-same-method-multiple-times">Call the same method multiple times</a></li> |
| <li><a class="reference internal" href="#mock-chained-methods">Mock chained methods</a></li> |
| <li><a class="reference internal" href="#mocking-a-context-manager">Mocking a context manager</a></li> |
| <li><a class="reference internal" href="#mocking-the-builtin-open-used-as-a-context-manager">Mocking the builtin open used as a context manager</a></li> |
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