Add hook for ensuring vcs permalinks
diff --git a/tests/check_vcs_permalinks_test.py b/tests/check_vcs_permalinks_test.py
new file mode 100644
index 0000000..31fd608
--- /dev/null
+++ b/tests/check_vcs_permalinks_test.py
@@ -0,0 +1,36 @@
+from __future__ import absolute_import
+from __future__ import unicode_literals
+
+from pre_commit_hooks.check_vcs_permalinks import main
+
+
+def test_trivial(tmpdir):
+ f = tmpdir.join('f.txt').ensure()
+ assert not main((f.strpath,))
+
+
+def test_passing(tmpdir):
+ f = tmpdir.join('f.txt')
+ f.write_binary(
+ # permalinks are ok
+ b'https://github.com/asottile/test/blob/649e6/foo%20bar#L1\n'
+ # links to files but not line numbers are ok
+ b'https://github.com/asottile/test/blob/master/foo%20bar\n',
+ )
+ assert not main((f.strpath,))
+
+
+def test_failing(tmpdir, capsys):
+ with tmpdir.as_cwd():
+ tmpdir.join('f.txt').write_binary(
+ b'https://github.com/asottile/test/blob/master/foo#L1\n',
+ )
+
+ assert main(('f.txt',))
+ out, _ = capsys.readouterr()
+ assert out == (
+ 'f.txt:1:https://github.com/asottile/test/blob/master/foo#L1\n'
+ '\n'
+ 'Non-permanent github link detected.\n'
+ 'On any page on github press [y] to load a permalink.\n'
+ )
