Move test helpers into the coverage package so others can use them

--HG--
rename : tests/backunittest.py => coverage/backunittest.py

1 files changed, 41 insertions, 0 deletions

diff --git a/coverage/backunittest.py b/coverage/backunittest.py
new file mode 100644
index 00000000..6498397f
--- /dev/null
+++ b/coverage/backunittest.py
@@ -0,0 +1,41 @@
+"""Implementations of unittest features from the future."""
+
+# Use unittest2 if it's available, otherwise unittest.  This gives us
+# backported features for 2.6.
+try:
+    import unittest2 as unittest            # pylint: disable=F0401
+except ImportError:
+    import unittest
+
+
+def unittest_has(method):
+    """Does `unitttest.TestCase` have `method` defined?"""
+    return hasattr(unittest.TestCase, method)
+
+
+class TestCase(unittest.TestCase):
+    """Just like unittest.TestCase, but with assert methods added.
+
+    Designed to be compatible with 3.1 unittest.  Methods are only defined if
+    `unittest` doesn't have them.
+
+    """
+    # pylint: disable=missing-docstring
+
+    if not unittest_has('assertCountEqual'):
+        if unittest_has('assertSameElements'):
+            def assertCountEqual(self, *args, **kwargs):
+                # pylint: disable=no-member
+                return self.assertSameElements(*args, **kwargs)
+        else:
+            def assertCountEqual(self, s1, s2):
+                """Assert these have the same elements, regardless of order."""
+                self.assertEqual(set(s1), set(s2))
+
+    if not unittest_has('assertRaisesRegex'):
+        def assertRaisesRegex(self, *args, **kwargs):
+            return self.assertRaisesRegexp(*args, **kwargs)
+
+    if not unittest_has('assertRegex'):
+        def assertRegex(self, *args, **kwargs):
+            return self.assertRegexpMatches(*args, **kwargs)