diff --git a/Lib/unittest/loader.py b/Lib/unittest/loader.py
index 9163a1a..3c161b5 100644
--- a/Lib/unittest/loader.py
+++ b/Lib/unittest/loader.py
@@ -46,7 +46,7 @@
     _top_level_dir = None
 
     def loadTestsFromTestCase(self, testCaseClass):
-        """Return a suite of all tests cases contained in testCaseClass"""
+        """Return a suite of all test cases contained in testCaseClass"""
         if issubclass(testCaseClass, suite.TestSuite):
             raise TypeError("Test cases should not be derived from TestSuite." \
                                 " Maybe you meant to derive from TestCase?")
@@ -57,7 +57,7 @@
         return loaded_suite
 
     def loadTestsFromModule(self, module, use_load_tests=True):
-        """Return a suite of all tests cases contained in the given module"""
+        """Return a suite of all test cases contained in the given module"""
         tests = []
         for name in dir(module):
             obj = getattr(module, name)
@@ -75,7 +75,7 @@
         return tests
 
     def loadTestsFromName(self, name, module=None):
-        """Return a suite of all tests cases given a string specifier.
+        """Return a suite of all test cases given a string specifier.
 
         The name may resolve either to a module, a test case class, a
         test method within a test case class, or a callable object which
@@ -124,7 +124,7 @@
             raise TypeError("don't know how to make test from: %s" % obj)
 
     def loadTestsFromNames(self, names, module=None):
-        """Return a suite of all tests cases found using the given sequence
+        """Return a suite of all test cases found using the given sequence
         of string specifiers. See 'loadTestsFromName()'.
         """
         suites = [self.loadTestsFromName(name, module) for name in names]
diff --git a/Lib/unittest/test/test_loader.py b/Lib/unittest/test/test_loader.py
index 68e871c..d46ddc8 100644
--- a/Lib/unittest/test/test_loader.py
+++ b/Lib/unittest/test/test_loader.py
@@ -10,7 +10,7 @@
     ### Tests for TestLoader.loadTestsFromTestCase
     ################################################################
 
-    # "Return a suite of all tests cases contained in the TestCase-derived
+    # "Return a suite of all test cases contained in the TestCase-derived
     # class testCaseClass"
     def test_loadTestsFromTestCase(self):
         class Foo(unittest.TestCase):
@@ -23,7 +23,7 @@
         loader = unittest.TestLoader()
         self.assertEqual(loader.loadTestsFromTestCase(Foo), tests)
 
-    # "Return a suite of all tests cases contained in the TestCase-derived
+    # "Return a suite of all test cases contained in the TestCase-derived
     # class testCaseClass"
     #
     # Make sure it does the right thing even if no tests were found
@@ -36,7 +36,7 @@
         loader = unittest.TestLoader()
         self.assertEqual(loader.loadTestsFromTestCase(Foo), empty_suite)
 
-    # "Return a suite of all tests cases contained in the TestCase-derived
+    # "Return a suite of all test cases contained in the TestCase-derived
     # class testCaseClass"
     #
     # What happens if loadTestsFromTestCase() is given an object
@@ -57,7 +57,7 @@
         else:
             self.fail('Should raise TypeError')
 
-    # "Return a suite of all tests cases contained in the TestCase-derived
+    # "Return a suite of all test cases contained in the TestCase-derived
     # class testCaseClass"
     #
     # Make sure loadTestsFromTestCase() picks up the default test method