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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/159977">159977</a></dd>
<dt>Author</dt> <dd>commit-queue@webkit.org</dd>
<dt>Date</dt> <dd>2013-12-02 15:52:34 -0800 (Mon, 02 Dec 2013)</dd>
</dl>

<h3>Log Message</h3>
<pre>Remove the stderr_write attribute from StyleProcessorConfiguration
https://bugs.webkit.org/show_bug.cgi?id=124703

Patch by László Langó &lt;lango@inf.u-szeged.hu&gt; on 2013-12-02
Reviewed by Ryosuke Niwa.

Remove the stderr_write attribute from this class in checker and
replace its use with calls to a logging module logger. We Should
use logging module instead of writing to stderr directly.

* Scripts/webkitpy/style/checker.py: Change stderr_write attribute to logging module logger.
(check_webkit_style_configuration):
(CheckerDispatcher.dispatch): Remove FIXME comment.
(StyleProcessorConfiguration):
(StyleProcessorConfiguration.__init__):
(StyleProcessorConfiguration.write_style_error):
* Scripts/webkitpy/style/checker_unittest.py: Update test to the modification.
There is an &quot;ERROR&quot; prefix in log messiges from now.
(StyleProcessorConfigurationTest):
(StyleProcessorConfigurationTest._style_checker_configuration):
(StyleProcessorConfigurationTest.test_init):
(StyleProcessorConfigurationTest.test_write_style_error_emacs):
(StyleProcessorConfigurationTest.test_write_style_error_vs7):
(StyleProcessor_EndToEndTest.with):
(StyleProcessor_EndToEndTest.test_init):
(StyleProcessor_EndToEndTest.test_process):
(StyleProcessor_CodeCoverageTest.setUp):
* Scripts/webkitpy/style/error_handlers.py: Remove stderr_write usage and replace with logging module logger.
(DefaultStyleErrorHandler.__call__):
* Scripts/webkitpy/style/error_handlers_unittest.py: Update test to the modification.
There is an &quot;ERROR&quot; prefix in log messiges from now.
(DefaultStyleErrorHandlerTest):
(DefaultStyleErrorHandlerTest.setUp):
(DefaultStyleErrorHandlerTest._mock_increment_error_count):
(DefaultStyleErrorHandlerTest._style_checker_configuration):
(DefaultStyleErrorHandlerTest._check_initialized):
(DefaultStyleErrorHandlerTest.test_non_reportable_error):
(DefaultStyleErrorHandlerTest.test_max_reports_per_category):
(DefaultStyleErrorHandlerTest.test_line_numbers):</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkToolsChangeLog">trunk/Tools/ChangeLog</a></li>
<li><a href="#trunkToolsScriptswebkitpystylecheckerpy">trunk/Tools/Scripts/webkitpy/style/checker.py</a></li>
<li><a href="#trunkToolsScriptswebkitpystylechecker_unittestpy">trunk/Tools/Scripts/webkitpy/style/checker_unittest.py</a></li>
<li><a href="#trunkToolsScriptswebkitpystyleerror_handlerspy">trunk/Tools/Scripts/webkitpy/style/error_handlers.py</a></li>
<li><a href="#trunkToolsScriptswebkitpystyleerror_handlers_unittestpy">trunk/Tools/Scripts/webkitpy/style/error_handlers_unittest.py</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkToolsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Tools/ChangeLog (159976 => 159977)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Tools/ChangeLog        2013-12-02 23:48:35 UTC (rev 159976)
+++ trunk/Tools/ChangeLog        2013-12-02 23:52:34 UTC (rev 159977)
</span><span class="lines">@@ -1,3 +1,44 @@
</span><ins>+2013-12-02  László Langó  &lt;lango@inf.u-szeged.hu&gt;
+
+        Remove the stderr_write attribute from StyleProcessorConfiguration
+        https://bugs.webkit.org/show_bug.cgi?id=124703
+
+        Reviewed by Ryosuke Niwa.
+
+        Remove the stderr_write attribute from this class in checker and
+        replace its use with calls to a logging module logger. We Should 
+        use logging module instead of writing to stderr directly.
+
+        * Scripts/webkitpy/style/checker.py: Change stderr_write attribute to logging module logger.
+        (check_webkit_style_configuration):
+        (CheckerDispatcher.dispatch): Remove FIXME comment.
+        (StyleProcessorConfiguration):
+        (StyleProcessorConfiguration.__init__):
+        (StyleProcessorConfiguration.write_style_error):
+        * Scripts/webkitpy/style/checker_unittest.py: Update test to the modification.
+        There is an &quot;ERROR&quot; prefix in log messiges from now.
+        (StyleProcessorConfigurationTest):
+        (StyleProcessorConfigurationTest._style_checker_configuration):
+        (StyleProcessorConfigurationTest.test_init):
+        (StyleProcessorConfigurationTest.test_write_style_error_emacs):
+        (StyleProcessorConfigurationTest.test_write_style_error_vs7):
+        (StyleProcessor_EndToEndTest.with):
+        (StyleProcessor_EndToEndTest.test_init):
+        (StyleProcessor_EndToEndTest.test_process):
+        (StyleProcessor_CodeCoverageTest.setUp):
+        * Scripts/webkitpy/style/error_handlers.py: Remove stderr_write usage and replace with logging module logger.
+        (DefaultStyleErrorHandler.__call__):
+        * Scripts/webkitpy/style/error_handlers_unittest.py: Update test to the modification.
+        There is an &quot;ERROR&quot; prefix in log messiges from now.
+        (DefaultStyleErrorHandlerTest):
+        (DefaultStyleErrorHandlerTest.setUp):
+        (DefaultStyleErrorHandlerTest._mock_increment_error_count):
+        (DefaultStyleErrorHandlerTest._style_checker_configuration):
+        (DefaultStyleErrorHandlerTest._check_initialized):
+        (DefaultStyleErrorHandlerTest.test_non_reportable_error):
+        (DefaultStyleErrorHandlerTest.test_max_reports_per_category):
+        (DefaultStyleErrorHandlerTest.test_line_numbers):
+
</ins><span class="cx"> 2013-12-02  Brian J. Burg  &lt;burg@cs.washington.edu&gt;
</span><span class="cx"> 
</span><span class="cx">         Add JavaScript style checker and teach checker.py about .js files
</span></span></pre></div>
<a id="trunkToolsScriptswebkitpystylecheckerpy"></a>
<div class="modfile"><h4>Modified: trunk/Tools/Scripts/webkitpy/style/checker.py (159976 => 159977)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Tools/Scripts/webkitpy/style/checker.py        2013-12-02 23:48:35 UTC (rev 159976)
+++ trunk/Tools/Scripts/webkitpy/style/checker.py        2013-12-02 23:52:34 UTC (rev 159977)
</span><span class="lines">@@ -398,8 +398,7 @@
</span><span class="cx">     return StyleProcessorConfiguration(filter_configuration=filter_configuration,
</span><span class="cx">                max_reports_per_category=_MAX_REPORTS_PER_CATEGORY,
</span><span class="cx">                min_confidence=options.min_confidence,
</span><del>-               output_format=options.output_format,
-               stderr_write=sys.stderr.write)
</del><ins>+               output_format=options.output_format)
</ins><span class="cx"> 
</span><span class="cx"> 
</span><span class="cx"> def _create_log_handlers(stream):
</span><span class="lines">@@ -654,8 +653,6 @@
</span><span class="cx">         return checker
</span><span class="cx"> 
</span><span class="cx"> 
</span><del>-# FIXME: Remove the stderr_write attribute from this class and replace
-#        its use with calls to a logging module logger.
</del><span class="cx"> class StyleProcessorConfiguration(object):
</span><span class="cx"> 
</span><span class="cx">     &quot;&quot;&quot;Stores configuration values for the StyleProcessor class.
</span><span class="lines">@@ -667,17 +664,13 @@
</span><span class="cx">       max_reports_per_category: The maximum number of errors to report
</span><span class="cx">                                 per category, per file.
</span><span class="cx"> 
</span><del>-      stderr_write: A function that takes a string as a parameter and
-                    serves as stderr.write.
-
</del><span class="cx">     &quot;&quot;&quot;
</span><span class="cx"> 
</span><span class="cx">     def __init__(self,
</span><span class="cx">                  filter_configuration,
</span><span class="cx">                  max_reports_per_category,
</span><span class="cx">                  min_confidence,
</span><del>-                 output_format,
-                 stderr_write):
</del><ins>+                 output_format):
</ins><span class="cx">         &quot;&quot;&quot;Create a StyleProcessorConfiguration instance.
</span><span class="cx"> 
</span><span class="cx">         Args:
</span><span class="lines">@@ -696,16 +689,12 @@
</span><span class="cx">                          output formats are &quot;emacs&quot; which emacs can parse
</span><span class="cx">                          and &quot;vs7&quot; which Microsoft Visual Studio 7 can parse.
</span><span class="cx"> 
</span><del>-          stderr_write: A function that takes a string as a parameter and
-                        serves as stderr.write.
-
</del><span class="cx">         &quot;&quot;&quot;
</span><span class="cx">         self._filter_configuration = filter_configuration
</span><span class="cx">         self._output_format = output_format
</span><span class="cx"> 
</span><span class="cx">         self.max_reports_per_category = max_reports_per_category
</span><span class="cx">         self.min_confidence = min_confidence
</span><del>-        self.stderr_write = stderr_write
</del><span class="cx"> 
</span><span class="cx">     def is_reportable(self, category, confidence_in_error, file_path):
</span><span class="cx">         &quot;&quot;&quot;Return whether an error is reportable.
</span><span class="lines">@@ -735,11 +724,11 @@
</span><span class="cx">                           message):
</span><span class="cx">         &quot;&quot;&quot;Write a style error to the configured stderr.&quot;&quot;&quot;
</span><span class="cx">         if self._output_format == 'vs7':
</span><del>-            format_string = &quot;%s(%s):  %s  [%s] [%d]\n&quot;
</del><ins>+            format_string = &quot;%s(%s):  %s  [%s] [%d]&quot;
</ins><span class="cx">         else:
</span><del>-            format_string = &quot;%s:%s:  %s  [%s] [%d]\n&quot;
</del><ins>+            format_string = &quot;%s:%s:  %s  [%s] [%d]&quot;
</ins><span class="cx"> 
</span><del>-        self.stderr_write(format_string % (file_path,
</del><ins>+        _log.error(format_string % (file_path,
</ins><span class="cx">                                            line_number,
</span><span class="cx">                                            message,
</span><span class="cx">                                            category,
</span></span></pre></div>
<a id="trunkToolsScriptswebkitpystylechecker_unittestpy"></a>
<div class="modfile"><h4>Modified: trunk/Tools/Scripts/webkitpy/style/checker_unittest.py (159976 => 159977)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Tools/Scripts/webkitpy/style/checker_unittest.py        2013-12-02 23:48:35 UTC (rev 159976)
+++ trunk/Tools/Scripts/webkitpy/style/checker_unittest.py        2013-12-02 23:52:34 UTC (rev 159977)
</span><span class="lines">@@ -596,17 +596,10 @@
</span><span class="cx">             self.assert_checker_none(path)
</span><span class="cx"> 
</span><span class="cx"> 
</span><del>-class StyleProcessorConfigurationTest(unittest.TestCase):
</del><ins>+class StyleProcessorConfigurationTest(LoggingTestCase):
</ins><span class="cx"> 
</span><span class="cx">     &quot;&quot;&quot;Tests the StyleProcessorConfiguration class.&quot;&quot;&quot;
</span><span class="cx"> 
</span><del>-    def setUp(self):
-        self._error_messages = []
-        &quot;&quot;&quot;The messages written to _mock_stderr_write() of this class.&quot;&quot;&quot;
-
-    def _mock_stderr_write(self, message):
-        self._error_messages.append(message)
-
</del><span class="cx">     def _style_checker_configuration(self, output_format=&quot;vs7&quot;):
</span><span class="cx">         &quot;&quot;&quot;Return a StyleProcessorConfiguration instance for testing.&quot;&quot;&quot;
</span><span class="cx">         base_rules = [&quot;-whitespace&quot;, &quot;+whitespace/tab&quot;]
</span><span class="lines">@@ -616,8 +609,7 @@
</span><span class="cx">                    filter_configuration=filter_configuration,
</span><span class="cx">                    max_reports_per_category={&quot;whitespace/newline&quot;: 1},
</span><span class="cx">                    min_confidence=3,
</span><del>-                   output_format=output_format,
-                   stderr_write=self._mock_stderr_write)
</del><ins>+                   output_format=output_format)
</ins><span class="cx"> 
</span><span class="cx">     def test_init(self):
</span><span class="cx">         &quot;&quot;&quot;Test the __init__() method.&quot;&quot;&quot;
</span><span class="lines">@@ -626,7 +618,6 @@
</span><span class="cx">         # Check that __init__ sets the &quot;public&quot; data attributes correctly.
</span><span class="cx">         self.assertEqual(configuration.max_reports_per_category,
</span><span class="cx">                           {&quot;whitespace/newline&quot;: 1})
</span><del>-        self.assertEqual(configuration.stderr_write, self._mock_stderr_write)
</del><span class="cx">         self.assertEqual(configuration.min_confidence, 3)
</span><span class="cx"> 
</span><span class="cx">     def test_is_reportable(self):
</span><span class="lines">@@ -652,56 +643,44 @@
</span><span class="cx">     def test_write_style_error_emacs(self):
</span><span class="cx">         &quot;&quot;&quot;Test the write_style_error() method.&quot;&quot;&quot;
</span><span class="cx">         self._call_write_style_error(&quot;emacs&quot;)
</span><del>-        self.assertEqual(self._error_messages,
-                          [&quot;foo.h:100:  message  [whitespace/tab] [5]\n&quot;])
</del><ins>+        self.assertLog([&quot;ERROR: foo.h:100:  message  [whitespace/tab] [5]\n&quot;])
</ins><span class="cx"> 
</span><span class="cx">     def test_write_style_error_vs7(self):
</span><span class="cx">         &quot;&quot;&quot;Test the write_style_error() method.&quot;&quot;&quot;
</span><span class="cx">         self._call_write_style_error(&quot;vs7&quot;)
</span><del>-        self.assertEqual(self._error_messages,
-                          [&quot;foo.h(100):  message  [whitespace/tab] [5]\n&quot;])
</del><ins>+        self.assertLog([&quot;ERROR: foo.h(100):  message  [whitespace/tab] [5]\n&quot;])
</ins><span class="cx"> 
</span><span class="cx"> 
</span><span class="cx"> class StyleProcessor_EndToEndTest(LoggingTestCase):
</span><span class="cx"> 
</span><span class="cx">     &quot;&quot;&quot;Test the StyleProcessor class with an emphasis on end-to-end tests.&quot;&quot;&quot;
</span><span class="cx"> 
</span><del>-    def setUp(self):
-        LoggingTestCase.setUp(self)
-        self._messages = []
-
-    def _mock_stderr_write(self, message):
-        &quot;&quot;&quot;Save a message so it can later be asserted.&quot;&quot;&quot;
-        self._messages.append(message)
-
</del><span class="cx">     def test_init(self):
</span><span class="cx">         &quot;&quot;&quot;Test __init__ constructor.&quot;&quot;&quot;
</span><span class="cx">         configuration = StyleProcessorConfiguration(
</span><span class="cx">                             filter_configuration=FilterConfiguration(),
</span><span class="cx">                             max_reports_per_category={},
</span><span class="cx">                             min_confidence=3,
</span><del>-                            output_format=&quot;vs7&quot;,
-                            stderr_write=self._mock_stderr_write)
</del><ins>+                            output_format=&quot;vs7&quot;)
</ins><span class="cx">         processor = StyleProcessor(configuration)
</span><span class="cx"> 
</span><span class="cx">         self.assertEqual(processor.error_count, 0)
</span><del>-        self.assertEqual(self._messages, [])
</del><span class="cx"> 
</span><span class="cx">     def test_process(self):
</span><span class="cx">         configuration = StyleProcessorConfiguration(
</span><span class="cx">                             filter_configuration=FilterConfiguration(),
</span><span class="cx">                             max_reports_per_category={},
</span><span class="cx">                             min_confidence=3,
</span><del>-                            output_format=&quot;vs7&quot;,
-                            stderr_write=self._mock_stderr_write)
</del><ins>+                            output_format=&quot;vs7&quot;)
</ins><span class="cx">         processor = StyleProcessor(configuration)
</span><span class="cx"> 
</span><span class="cx">         processor.process(lines=['line1', 'Line with tab:\t'],
</span><span class="cx">                           file_path='foo.txt')
</span><ins>+
</ins><span class="cx">         self.assertEqual(processor.error_count, 1)
</span><del>-        expected_messages = ['foo.txt(2):  Line contains tab character.  '
</del><ins>+        expected_messages = ['ERROR: foo.txt(2):  Line contains tab character.  '
</ins><span class="cx">                              '[whitespace/tab] [5]\n']
</span><del>-        self.assertEqual(self._messages, expected_messages)
</del><ins>+        self.assertLog(expected_messages)
</ins><span class="cx"> 
</span><span class="cx"> 
</span><span class="cx"> class StyleProcessor_CodeCoverageTest(LoggingTestCase):
</span><span class="lines">@@ -763,8 +742,7 @@
</span><span class="cx">                             filter_configuration=FilterConfiguration(),
</span><span class="cx">                             max_reports_per_category={&quot;whitespace/newline&quot;: 1},
</span><span class="cx">                             min_confidence=3,
</span><del>-                            output_format=&quot;vs7&quot;,
-                            stderr_write=self._swallow_stderr_message)
</del><ins>+                            output_format=&quot;vs7&quot;)
</ins><span class="cx"> 
</span><span class="cx">         mock_carriage_checker_class = self._create_carriage_checker_class()
</span><span class="cx">         mock_dispatcher = self.MockDispatcher()
</span></span></pre></div>
<a id="trunkToolsScriptswebkitpystyleerror_handlerspy"></a>
<div class="modfile"><h4>Modified: trunk/Tools/Scripts/webkitpy/style/error_handlers.py (159976 => 159977)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Tools/Scripts/webkitpy/style/error_handlers.py        2013-12-02 23:48:35 UTC (rev 159976)
+++ trunk/Tools/Scripts/webkitpy/style/error_handlers.py        2013-12-02 23:52:34 UTC (rev 159977)
</span><span class="lines">@@ -49,9 +49,13 @@
</span><span class="cx"> &quot;&quot;&quot;
</span><span class="cx"> 
</span><span class="cx"> 
</span><ins>+import logging
</ins><span class="cx"> import sys
</span><span class="cx"> 
</span><span class="cx"> 
</span><ins>+_log = logging.getLogger(__name__)
+
+
</ins><span class="cx"> class DefaultStyleErrorHandler(object):
</span><span class="cx"> 
</span><span class="cx">     &quot;&quot;&quot;The default style error handler.&quot;&quot;&quot;
</span><span class="lines">@@ -159,6 +163,6 @@
</span><span class="cx">                                               line_number=line_number,
</span><span class="cx">                                               message=message)
</span><span class="cx">         if category_total == max_reports:
</span><del>-            self._configuration.stderr_write(&quot;Suppressing further [%s] reports &quot;
-                                             &quot;for this file.\n&quot; % category)
</del><ins>+            _log.error(&quot;Suppressing further [%s] reports &quot;
+                                             &quot;for this file.&quot; % category)
</ins><span class="cx">         return True
</span></span></pre></div>
<a id="trunkToolsScriptswebkitpystyleerror_handlers_unittestpy"></a>
<div class="modfile"><h4>Modified: trunk/Tools/Scripts/webkitpy/style/error_handlers_unittest.py (159976 => 159977)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Tools/Scripts/webkitpy/style/error_handlers_unittest.py        2013-12-02 23:48:35 UTC (rev 159976)
+++ trunk/Tools/Scripts/webkitpy/style/error_handlers_unittest.py        2013-12-02 23:52:34 UTC (rev 159977)
</span><span class="lines">@@ -28,14 +28,15 @@
</span><span class="cx"> from checker import StyleProcessorConfiguration
</span><span class="cx"> from error_handlers import DefaultStyleErrorHandler
</span><span class="cx"> from filter import FilterConfiguration
</span><ins>+from webkitpy.common.system.logtesting import LoggingTestCase
</ins><span class="cx"> 
</span><span class="cx"> 
</span><del>-class DefaultStyleErrorHandlerTest(unittest.TestCase):
</del><ins>+class DefaultStyleErrorHandlerTest(LoggingTestCase):
</ins><span class="cx"> 
</span><span class="cx">     &quot;&quot;&quot;Tests the DefaultStyleErrorHandler class.&quot;&quot;&quot;
</span><span class="cx"> 
</span><span class="cx">     def setUp(self):
</span><del>-        self._error_messages = []
</del><ins>+        super(DefaultStyleErrorHandlerTest, self).setUp()
</ins><span class="cx">         self._error_count = 0
</span><span class="cx"> 
</span><span class="cx">     _category = &quot;whitespace/tab&quot;
</span><span class="lines">@@ -47,9 +48,6 @@
</span><span class="cx">     def _mock_increment_error_count(self):
</span><span class="cx">         self._error_count += 1
</span><span class="cx"> 
</span><del>-    def _mock_stderr_write(self, message):
-        self._error_messages.append(message)
-
</del><span class="cx">     def _style_checker_configuration(self):
</span><span class="cx">         &quot;&quot;&quot;Return a StyleProcessorConfiguration instance for testing.&quot;&quot;&quot;
</span><span class="cx">         base_rules = [&quot;-whitespace&quot;, &quot;+whitespace/tab&quot;]
</span><span class="lines">@@ -59,8 +57,7 @@
</span><span class="cx">                    filter_configuration=filter_configuration,
</span><span class="cx">                    max_reports_per_category={&quot;whitespace/tab&quot;: 2},
</span><span class="cx">                    min_confidence=3,
</span><del>-                   output_format=&quot;vs7&quot;,
-                   stderr_write=self._mock_stderr_write)
</del><ins>+                   output_format=&quot;vs7&quot;)
</ins><span class="cx"> 
</span><span class="cx">     def _error_handler(self, configuration, line_numbers=None):
</span><span class="cx">         return DefaultStyleErrorHandler(configuration=configuration,
</span><span class="lines">@@ -71,7 +68,6 @@
</span><span class="cx">     def _check_initialized(self):
</span><span class="cx">         &quot;&quot;&quot;Check that count and error messages are initialized.&quot;&quot;&quot;
</span><span class="cx">         self.assertEqual(0, self._error_count)
</span><del>-        self.assertEqual(0, len(self._error_messages))
</del><span class="cx"> 
</span><span class="cx">     def _call_error_handler(self, handle_error, confidence, line_number=100):
</span><span class="cx">         &quot;&quot;&quot;Call the given error handler with a test error.&quot;&quot;&quot;
</span><span class="lines">@@ -132,7 +128,6 @@
</span><span class="cx">         self._call_error_handler(error_handler, confidence)
</span><span class="cx"> 
</span><span class="cx">         self.assertEqual(0, self._error_count)
</span><del>-        self.assertEqual([], self._error_messages)
</del><span class="cx"> 
</span><span class="cx">     # Also serves as a reportable error test.
</span><span class="cx">     def test_max_reports_per_category(self):
</span><span class="lines">@@ -146,26 +141,21 @@
</span><span class="cx">         # First call: usual reporting.
</span><span class="cx">         self._call_error_handler(error_handler, confidence)
</span><span class="cx">         self.assertEqual(1, self._error_count)
</span><del>-        self.assertEqual(1, len(self._error_messages))
-        self.assertEqual(self._error_messages,
-                          [&quot;foo.h(100):  message  [whitespace/tab] [5]\n&quot;])
</del><ins>+        self.assertLog([&quot;ERROR: foo.h(100):  message  [whitespace/tab] [5]\n&quot;])
</ins><span class="cx"> 
</span><span class="cx">         # Second call: suppression message reported.
</span><span class="cx">         self._call_error_handler(error_handler, confidence)
</span><span class="cx">         # The &quot;Suppressing further...&quot; message counts as an additional
</span><span class="cx">         # message (but not as an addition to the error count).
</span><span class="cx">         self.assertEqual(2, self._error_count)
</span><del>-        self.assertEqual(3, len(self._error_messages))
-        self.assertEqual(self._error_messages[-2],
-                          &quot;foo.h(100):  message  [whitespace/tab] [5]\n&quot;)
-        self.assertEqual(self._error_messages[-1],
-                          &quot;Suppressing further [whitespace/tab] reports &quot;
-                          &quot;for this file.\n&quot;)
</del><ins>+        expected_message = [&quot;ERROR: foo.h(100):  message  [whitespace/tab] [5]\n&quot;,
+                            &quot;ERROR: Suppressing further [whitespace/tab] reports for this file.\n&quot;]
+        self.assertLog(expected_message)
</ins><span class="cx"> 
</span><span class="cx">         # Third call: no report.
</span><span class="cx">         self._call_error_handler(error_handler, confidence)
</span><span class="cx">         self.assertEqual(3, self._error_count)
</span><del>-        self.assertEqual(3, len(self._error_messages))
</del><ins>+        self.assertLog([])
</ins><span class="cx"> 
</span><span class="cx">     def test_line_numbers(self):
</span><span class="cx">         &quot;&quot;&quot;Test the line_numbers parameter.&quot;&quot;&quot;
</span><span class="lines">@@ -178,19 +168,16 @@
</span><span class="cx">         # Error on non-modified line: no error.
</span><span class="cx">         self._call_error_handler(error_handler, confidence, line_number=60)
</span><span class="cx">         self.assertEqual(0, self._error_count)
</span><del>-        self.assertEqual([], self._error_messages)
</del><ins>+        self.assertLog([])
</ins><span class="cx"> 
</span><span class="cx">         # Error on modified line: error.
</span><span class="cx">         self._call_error_handler(error_handler, confidence, line_number=50)
</span><span class="cx">         self.assertEqual(1, self._error_count)
</span><del>-        self.assertEqual(self._error_messages,
-                          [&quot;foo.h(50):  message  [whitespace/tab] [5]\n&quot;])
</del><ins>+        self.assertLog([&quot;ERROR: foo.h(50):  message  [whitespace/tab] [5]\n&quot;])
</ins><span class="cx"> 
</span><span class="cx">         # Error on non-modified line after turning off line filtering: error.
</span><span class="cx">         error_handler.turn_off_line_filtering()
</span><span class="cx">         self._call_error_handler(error_handler, confidence, line_number=60)
</span><span class="cx">         self.assertEqual(2, self._error_count)
</span><del>-        self.assertEqual(self._error_messages,
-                          ['foo.h(50):  message  [whitespace/tab] [5]\n',
-                           'foo.h(60):  message  [whitespace/tab] [5]\n',
-                           'Suppressing further [whitespace/tab] reports for this file.\n'])
</del><ins>+        self.assertLog(['ERROR: foo.h(60):  message  [whitespace/tab] [5]\n',
+                        'ERROR: Suppressing further [whitespace/tab] reports for this file.\n'])
</ins></span></pre>
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