unittest: Factor out adhoc run_class() method.

TODO: Look for compliant analog.

unittest/unittest.py

@@ -25,14 +25,19 @@ class TestCase:
             raise
 
 
-def main(module="__main__"):
+# TODO: Uncompliant
-    m = __import__(module)
+def run_class(c):
-    for tn in dir(m):
-        c = getattr(m, tn)
-        if isinstance(c, object) and issubclass(c, TestCase):
     o = c()
     for name in dir(o):
         if name.startswith("test"):
             m = getattr(o, name)
             m()
             print(name, "...ok")
+
+
+def main(module="__main__"):
+    m = __import__(module)
+    for tn in dir(m):
+        c = getattr(m, tn)
+        if isinstance(c, object) and issubclass(c, TestCase):
+            run_class(c)