Parse the test executable output on the fly.

tests/run_test_cases_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 import logging
 import os
 import shutil
 import subprocess
 import sys
@@ skipping 222 matching lines @@
       self.assertFalse(verbose)
       return 89
 
     try:
       run_test_cases.run_test_cases = expect
       result = run_test_cases.main([exe, '--gtest_filter=Foo.Bar*-*.Bar2'])
       self.assertEquals(89, result)
     finally:
       run_test_cases.run_test_cases = old
 
+  def test_convert_to_lines(self):
+    data = [
+      (
+        ('blah'),
+        ['blah'],
+      ),
+      (
+        ('blah\n'),
+        ['blah\n'],
+      ),
+      (
+        ('blah', '\n'),
+        ['blah\n'],
+      ),
+      (
+        ('\n'),
+        ['\n'],
+      ),
+      (
+        ('blah blah\nboo'),
+        ['blah blah\n', 'boo'],
+      ),
+      (
+        ('b', 'lah blah\nboo'),
+        ['blah blah\n', 'boo'],
+      ),
+    ]
+    for generator, expected in data:
+      self.assertEqual(
+          expected,
+          list(run_test_cases.convert_to_lines(generator)))
+
   def testRunSome(self):
     tests = [
         # Try with named arguments. Accepts 3*1 failures.
         (
           run_test_cases.RunSome(
               expected_count=10,
               retries=2,
               min_failures=1,
               max_failure_ratio=0.001,
               max_failures=None),
@@ skipping 355 matching lines @@
         self.fail()
     except FearsomeException:
       self.assertEquals(True, task_added)
 
 
 if __name__ == '__main__':
   VERBOSE = '-v' in sys.argv
   logging.basicConfig(level=logging.DEBUG if VERBOSE else logging.ERROR)
   unittest.TestCase.maxDiff = 5000
   unittest.main()