unittest: Rewrite .main() to be compliant re: 1st arg.

unittest/unittest.py

@@ -25,10 +25,12 @@ class TestCase:
             raise
 
 
-# Warning: this is not compliant, but at least an example of test
+def main(module="__main__"):
-# runner until we have globals()
+    m = __import__(module)
-def main(test_classes):
+    for tn in dir(m):
-    for c in test_classes:
+        c = getattr(m, tn)
+        # workaround for isinstance(c, object) not working
+        if type(c) is type(object) and issubclass(c, TestCase):
             o = c()
             for name in dir(o):
                 if name.startswith("test"):