tests: unittest2 import behaviour appears to differ between 2/3.

In 2 the module is loaded as __main__
In 3 it has its actual name.

tests/call_error_test.py

@@ -6,9 +6,8 @@ import unittest2
 
 import mitogen.core
 
-
-class MyError(Exception):
-    pass
+import testlib
+import plain_old_module
 
 
 class ConstructorTest(unittest2.TestCase):
@@ -23,9 +22,9 @@ class ConstructorTest(unittest2.TestCase):
         self.assertEquals(e.args[0], '11')
 
     def test_from_exc(self):
-        ve = MyError('eek')
+        ve = plain_old_module.MyError('eek')
         e = self.klass(ve)
-        self.assertEquals(e.args[0], '__main__.MyError: eek')
+        self.assertEquals(e.args[0], 'plain_old_module.MyError: eek')
 
     def test_form_base_exc(self):
         ve = SystemExit('eek')
@@ -34,12 +33,12 @@ class ConstructorTest(unittest2.TestCase):
 
     def test_from_exc_tb(self):
         try:
-            raise MyError('eek')
-        except MyError:
+            raise plain_old_module.MyError('eek')
+        except plain_old_module.MyError:
             ve = sys.exc_info()[1]
             e = self.klass(ve)
 
-        self.assertTrue(e.args[0].startswith('__main__.MyError: eek'))
+        self.assertTrue(e.args[0].startswith('plain_old_module.MyError: eek'))
         self.assertTrue('test_from_exc_tb' in e.args[0])
 
 
@@ -57,20 +56,20 @@ class PickleTest(unittest2.TestCase):
         self.assertEquals(e2.args[0], '11')
 
     def test_from_exc(self):
-        ve = MyError('eek')
+        ve = plain_old_module.MyError('eek')
         e = self.klass(ve)
         e2 = pickle.loads(pickle.dumps(e))
-        self.assertEquals(e2.args[0], '__main__.MyError: eek')
+        self.assertEquals(e2.args[0], 'plain_old_module.MyError: eek')
 
     def test_from_exc_tb(self):
         try:
-            raise MyError('eek')
-        except MyError:
+            raise plain_old_module.MyError('eek')
+        except plain_old_module.MyError:
             ve = sys.exc_info()[1]
             e = self.klass(ve)
 
         e2 = pickle.loads(pickle.dumps(e))
-        self.assertTrue(e2.args[0].startswith('__main__.MyError: eek'))
+        self.assertTrue(e2.args[0].startswith('plain_old_module.MyError: eek'))
         self.assertTrue('test_from_exc_tb' in e2.args[0])
 
 

tests/call_function_test.py

@@ -7,10 +7,7 @@ import mitogen.core
 import mitogen.master
 
 import testlib
-
-
-class MyError(Exception):
-    pass
+import plain_old_module
 
 
 class CrazyType(object):
@@ -22,7 +19,7 @@ def function_that_adds_numbers(x, y):
 
 
 def function_that_fails():
-    raise MyError('exception text')
+    raise plain_old_module.MyError('exception text')
 
 
 def func_with_bad_return_value():
@@ -53,7 +50,7 @@ class CallFunctionTest(testlib.RouterMixin, testlib.TestCase):
 
         s = str(exc)
         etype, _, s = s.partition(': ')
-        self.assertEqual(etype, '__main__.MyError')
+        self.assertEqual(etype, 'plain_old_module.MyError')
 
         msg, _, s = s.partition('\n')
         self.assertEqual(msg, 'exception text')

tests/data/plain_old_module.py

@@ -6,6 +6,10 @@ fiddlery.
 import math
 
 
+class MyError(Exception):
+    pass
+
+
 def get_sentinel_value():
     # Some proof we're even talking to the mitogen-test Docker image
     return open('/etc/sentinel').read()