Extract the resolution of loader/runner classes. Allows None value to...

Extract the resolution of loader/runner classes. Allows None value to pass-through to unittest.main. Fixes #180.

CHANGES.txt

@@ -2,6 +2,12 @@
 CHANGES
 =======
 
+-----
+3.4.1
+-----
+
+* Issue #180: Fix regression in test command not caught by py.test-run tests.
+
 ---
 3.4
 ---

setuptools/command/test.py

@@ -158,12 +158,19 @@ class test(Command):
                         del_modules.append(name)
                 list(map(sys.modules.__delitem__, del_modules))
 
-        loader_ep = EntryPoint.parse("x="+self.test_loader)
-        loader_class = loader_ep.load(require=False)
-        runner_ep = EntryPoint.parse("x=" + self.test_runner)
-        runner_class = runner_ep.load(require=False)
         unittest.main(
             None, None, [unittest.__file__]+self.test_args,
-            testLoader=loader_class(),
-            testRunner=runner_class(),
+            testLoader=self._resolve_as_ep(self.test_loader),
+            testRunner=self._resolve_as_ep(self.test_runner),
         )
+
+    @staticmethod
+    def _resolve_as_ep(val):
+        """
+        Load the indicated attribute value, called, as a as if it were
+        specified as an entry point.
+        """
+        if val is None:
+            return
+        parsed = EntryPoint.parse("x=" + val)
+        return parsed.load(require=False)()