add boilerplate so the test modules can be run as scripts

tests/test_build_py.py

@@ -48,3 +48,6 @@ class BuildPyTestCase(support.TempdirManager, unittest.TestCase):
 
 def test_suite():
     return unittest.makeSuite(BuildPyTestCase)
+
+if __name__ == "__main__":
+    unittest.main(defaultTest="test_suite")

tests/test_build_scripts.py

@@ -72,3 +72,6 @@ class BuildScriptsTestCase(support.TempdirManager, unittest.TestCase):
 
 def test_suite():
     return unittest.makeSuite(BuildScriptsTestCase)
+
+if __name__ == "__main__":
+    unittest.main(defaultTest="test_suite")

tests/test_install_scripts.py

@@ -70,6 +70,8 @@ class InstallScriptsTestCase(support.TempdirManager, unittest.TestCase):
             self.assert_(name in installed)
 
 
-
 def test_suite():
     return unittest.makeSuite(InstallScriptsTestCase)
+
+if __name__ == "__main__":
+    unittest.main(defaultTest="test_suite")