Add PRESUBMIT checks for not required testharness expected files.

Tools/Scripts/webkitpy/layout_tests/models/testharness_results.py

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Utility module for testharness."""
+
+
+# const definitions
+TESTHARNESSREPORT_HEADER = 'This is a testharness.js-based test.'
+TESTHARNESSREPORT_FOOTER = 'Harness: the test ran to completion.'
+
+
+def is_testharness_output(content_text):
+    """
+    Returns whether the content_text in parameter is a testharness output.
+    """
+
+    # Leading and trailing white spaces are accepted.
+    lines = content_text.strip().splitlines()
+    lines = [line.strip() for line in lines]
+
+    # A testharness output is defined as containing the header and the footer.
+    found_header = False
+    found_footer = False
+    for line in lines:
+        if line == TESTHARNESSREPORT_HEADER:
+            found_header = True
+        elif line == TESTHARNESSREPORT_FOOTER:
+            found_footer = True
+
+    return found_header and found_footer
+
+
+def is_testharness_output_passing(content_text):
+    """
+    Returns whether the content_text in parameter is a passing testharness output.
+
+    Note:
+        It is expected that the |content_text| is a testharness output.
+    """
+
+    # Leading and trailing white spaces are accepted.
+    lines = content_text.strip().splitlines()
+    lines = [line.strip() for line in lines]
+
+    # The check is very conservative and rejects any unexpected content in the output.
+    for line in lines:
+        # There should be no empty lines.
+        if len(line) == 0:
+            return False
+
+        # Those lines are expected to be exactly equivalent.
+        if line == TESTHARNESSREPORT_HEADER or \
+           line == TESTHARNESSREPORT_FOOTER:
+            continue
+
+        # Those are expected passing output.
+        if line.startswith('CONSOLE') or \
+           line.startswith('PASS'):
+            continue
+
+        # Those are expected failing output.
+        if line.startswith('FAIL') or \
+           line.startswith('TIMEOUT') or \
+           line.startswith('NOTRUN') or \
+           line.startswith('Harness Error. harness_status = '):
+            return False
+
+        # Unexpected output should be considered as a failure.
+        return False
+
+    return True