Simplify debug-statemetns tests

diff --git a/testing/resources/file_with_debug.notpy b/testing/resources/file_with_debug.notpy
deleted file mode 100644
index faa23a2..0000000
--- a/testing/resources/file_with_debug.notpy
+++ /dev/null

@@ -1,5 +0,0 @@
-
-def foo(obj):
-    import pdb; pdb.set_trace()
-
-    return 5

diff --git a/tests/debug_statement_hook_test.py b/tests/debug_statement_hook_test.py
index 8832245..44c2011 100644
--- a/tests/debug_statement_hook_test.py
+++ b/tests/debug_statement_hook_test.py

@@ -4,72 +4,34 @@
 
 import ast
 
-import pytest
-
 from pre_commit_hooks.debug_statement_hook import debug_statement_hook
 from pre_commit_hooks.debug_statement_hook import DebugStatement
 from pre_commit_hooks.debug_statement_hook import ImportStatementParser
 from testing.util import get_resource_path
 
 
-@pytest.fixture
-def ast_with_no_debug_imports():
-    return ast.parse(
-        """
-import foo
-import bar
-import baz
-from foo import bar
-""",
-    )
-
-
-@pytest.fixture
-def ast_with_debug_import_form_1():
-    return ast.parse(
-        """
-
-import ipdb; ipdb.set_trace()
-
-""",
-    )
-
-
-@pytest.fixture
-def ast_with_debug_import_form_2():
-    return ast.parse(
-        """
-
-from pudb import set_trace; set_trace()
-
-""",
-    )
-
-
-def test_returns_no_debug_statements(ast_with_no_debug_imports):
+def test_no_debug_imports():
     visitor = ImportStatementParser()
-    visitor.visit(ast_with_no_debug_imports)
+    visitor.visit(ast.parse('import os\nfrom foo import bar\n'))
     assert visitor.debug_import_statements == []
 
 
-def test_returns_one_form_1(ast_with_debug_import_form_1):
+def test_finds_debug_import_attribute_access():
     visitor = ImportStatementParser()
-    visitor.visit(ast_with_debug_import_form_1)
-    assert visitor.debug_import_statements == [
-        DebugStatement('ipdb', 3, 0),
-    ]
+    visitor.visit(ast.parse('import ipdb; ipdb.set_trace()'))
+    assert visitor.debug_import_statements == [DebugStatement('ipdb', 1, 0)]
 
 
-def test_returns_one_form_2(ast_with_debug_import_form_2):
+def test_finds_debug_import_from_import():
     visitor = ImportStatementParser()
-    visitor.visit(ast_with_debug_import_form_2)
-    assert visitor.debug_import_statements == [
-        DebugStatement('pudb', 3, 0),
-    ]
+    visitor.visit(ast.parse('from pudb import set_trace; set_trace()'))
+    assert visitor.debug_import_statements == [DebugStatement('pudb', 1, 0)]
 
 
-def test_returns_one_for_failing_file():
-    ret = debug_statement_hook([get_resource_path('file_with_debug.notpy')])
+def test_returns_one_for_failing_file(tmpdir):
+    f_py = tmpdir.join('f.py')
+    f_py.write('def f():\n    import pdb; pdb.set_trace()')
+    ret = debug_statement_hook([f_py.strpath])
     assert ret == 1