Added test demonstrating issue #39

flake8/tests/test_main.py

@@ -0,0 +1,38 @@
+from __future__ import with_statement
+
+import unittest
+try:
+    from unittest import mock
+except ImportError:
+    import mock  # < PY33
+
+import setuptools
+from flake8 import main
+
+
+class TestMain(unittest.TestCase):
+    def setUp(self):
+        self.patches = {}
+
+    def tearDown(self):
+        assert len(self.patches.items()) == 0
+
+    def start_patch(self, patch):
+        self.patches[patch] = mock.patch(patch)
+        return self.patches[patch].start()
+
+    def stop_patches(self):
+        patches = self.patches.copy()
+        for k, v in patches.items():
+            v.stop()
+            del(self.patches[k])
+
+    def test_issue_39_regression(self):
+        distribution = setuptools.Distribution()
+        cmd = main.Flake8Command(distribution)
+        cmd.options_dict = {}
+        cmd.run()
+
+
+if __name__ == '__main__':
+    unittest.main()