Example of refactoring using rope library.

tools/telemetry/third_party/rope/ropetest/contrib/fixmodnamestest.py

+import unittest
+
+from ropetest import testutils
+from rope.contrib.fixmodnames import FixModuleNames
+from rope.contrib.generate import create_module, create_package
+
+
+# HACK: for making this test work on case-insensitive file-systems, it
+# uses a name.replace('x', '_') fixer.
+class FixModuleNamesTest(unittest.TestCase):
+
+    def setUp(self):
+        super(FixModuleNamesTest, self).setUp()
+        self.project = testutils.sample_project()
+
+    def tearDown(self):
+        testutils.remove_project(self.project)
+        super(FixModuleNamesTest, self).tearDown()
+
+    def test_simple_module_renaming(self):
+        mod = create_module(self.project, 'xod')
+        self.project.do(FixModuleNames(self.project).get_changes(_fixer))
+        self.assertFalse(mod.exists())
+        self.assertTrue(self.project.get_resource('_od.py').exists())
+
+    def test_packages_module_renaming(self):
+        pkg = create_package(self.project, 'xkg')
+        self.project.do(FixModuleNames(self.project).get_changes(_fixer))
+        self.assertFalse(pkg.exists())
+        self.assertTrue(self.project.get_resource('_kg/__init__.py').exists())
+
+    def test_fixing_contents(self):
+        mod1 = create_module(self.project, 'xod1')
+        mod2 = create_module(self.project, 'xod2')
+        mod1.write('import xod2\n')
+        mod2.write('import xod1\n')
+        self.project.do(FixModuleNames(self.project).get_changes(_fixer))
+        newmod1 = self.project.get_resource('_od1.py')
+        newmod2 = self.project.get_resource('_od2.py')
+        self.assertEquals('import _od2\n', newmod1.read())
+        self.assertEquals('import _od1\n', newmod2.read())
+
+    def test_handling_nested_modules(self):
+        pkg = create_package(self.project, 'xkg')
+        mod = create_module(self.project, 'xkg.xod')  # noqa
+        self.project.do(FixModuleNames(self.project).get_changes(_fixer))
+        self.assertFalse(pkg.exists())
+        self.assertTrue(self.project.get_resource('_kg/__init__.py').exists())
+        self.assertTrue(self.project.get_resource('_kg/_od.py').exists())
+
+
+def _fixer(name):
+    return name.replace('x', '_')
+
+if __name__ == '__main__':
+    unittest.main()