Python readability review for dbeam@.

third_party/closure_compiler/compiler_customization_test.py

Index: third_party/closure_compiler/compiler_customization_test.py
diff --git a/third_party/closure_compiler/compiler_customization_test.py b/third_party/closure_compiler/compiler_customization_test.py
index 950059c3f0f99bd2de8d734f6e26c5565231b43a..ead5b2e40741f580607fdbaa44a2becf7807392e 100755
--- a/third_party/closure_compiler/compiler_customization_test.py
+++ b/third_party/closure_compiler/compiler_customization_test.py
@@ -36,18 +36,17 @@ class CompilerCustomizationTest(unittest.TestCase):
     return self._checker.check(file_path)
 
   def _runCheckerTestExpectError(self, source_code, expected_error):
-    _, output = self._runChecker(source_code)
+    _, stderr = self._runChecker(source_code)
 
-    self.assertTrue(expected_error in output,
+    self.assertTrue(expected_error in stderr,
         msg="Expected chunk: \n%s\n\nOutput:\n%s\n" % (
-            expected_error, output))
+            expected_error, stderr))
 
   def _runCheckerTestExpectSuccess(self, source_code):
-    return_code, output = self._runChecker(source_code)
+    found_errors, stderr = self._runChecker(source_code)
 
-    self.assertTrue(return_code == 0,
-        msg="Expected success, got return code %d\n\nOutput:\n%s\n" % (
-            return_code, output))
+    self.assertFalse(found_errors,
+        msg="Expected success, but got failure\n\nOutput:\n%s\n" % stderr)
 
   def testGetInstance(self):
     self._runCheckerTestExpectError("""