Patch #1061904 / bug #878275: give a nicer error message when someone
accidentally derives from TestSuite instead of TestCase.
diff --git a/Lib/unittest.py b/Lib/unittest.py
index 3375067..70645fb 100644
--- a/Lib/unittest.py
+++ b/Lib/unittest.py
@@ -489,6 +489,8 @@
def loadTestsFromTestCase(self, testCaseClass):
"""Return a suite of all tests cases contained in testCaseClass"""
+ if issubclass(testCaseClass, TestSuite):
+ raise TypeError("Test cases should not be derived from TestSuite. Maybe you meant to derive from TestCase?")
testCaseNames = self.getTestCaseNames(testCaseClass)
if not testCaseNames and hasattr(testCaseClass, 'runTest'):
testCaseNames = ['runTest']