Add CheckChangeHasNoStrayWhitespace().

tests/presubmit_unittest.py

Index: tests/presubmit_unittest.py
diff --git a/tests/presubmit_unittest.py b/tests/presubmit_unittest.py
index 0f2ec1b577dd97c7a5ebb715f83b01eec481858b..cf21017bb6068591b18fc5cbc05a06553ad7a2a7 100755
--- a/tests/presubmit_unittest.py
+++ b/tests/presubmit_unittest.py
@@ -938,6 +938,7 @@ class CannedChecksUnittest(PresubmitTestsBase):
     self.mox.ReplayAll()
     members = [
       'CheckChangeHasBugField', 'CheckChangeHasDescription',
+      'CheckChangeHasNoStrayWhitespace',
       'CheckChangeHasOnlyOneEol', 'CheckChangeHasNoCR',
       'CheckChangeHasNoCrAndHasOnlyOneEol', 'CheckChangeHasNoTabs',
       'CheckChangeHasQaField', 'CheckChangeHasTestedField',
@@ -1093,6 +1094,14 @@ class CannedChecksUnittest(PresubmitTestsBase):
         'DO NOTSUBMIT', 'DO NOT ' + 'SUBMIT',
         presubmit.OutputApi.PresubmitError)
 
+  def testCheckChangeHasNoStrayWhitespace(self):
+    self.ContentTest(
+        lambda x,y,z:
+            presubmit_canned_checks.CheckChangeHasNoStrayWhitespace(x, y),
+        'Foo', 'Foo ',
+        presubmit.OutputApi.PresubmitPromptWarning)
+    
+
   def testCheckChangeHasOnlyOneEol(self):
     self.ReadFileTest(presubmit_canned_checks.CheckChangeHasOnlyOneEol,
                       "Hey!\nHo!\n", "Hey!\nHo!\n\n",