Extract diff_text function out of the Port class.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base_unittest.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base_unittest.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base_unittest.py b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base_unittest.py
index 76006bba63057271af0027e991d1eab2d3999df7..355e5d75fc791055671b0eb401cda6e8c42a330a 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base_unittest.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base_unittest.py
@@ -112,39 +112,6 @@ class PortTest(unittest.TestCase):
         port._run_wdiff = lambda a, b: 'PASS'
         self.assertEqual('PASS', port.wdiff_text(None, None))
 
-    def test_diff_text(self):
-        port = self.make_port()
-        # Make sure that we don't run into decoding exceptions when the
-        # filenames are unicode, with regular or malformed input (expected or
-        # actual input is always raw bytes, not unicode).
-        port.diff_text('exp', 'act', 'exp.txt', 'act.txt')
-        port.diff_text('exp', 'act', u'exp.txt', 'act.txt')
-        port.diff_text('exp', 'act', u'a\xac\u1234\u20ac\U00008000', 'act.txt')
-
-        port.diff_text('exp' + chr(255), 'act', 'exp.txt', 'act.txt')
-        port.diff_text('exp' + chr(255), 'act', u'exp.txt', 'act.txt')
-
-        # Though expected and actual files should always be read in with no
-        # encoding (and be stored as str objects), test unicode inputs just to
-        # be safe.
-        port.diff_text(u'exp', 'act', 'exp.txt', 'act.txt')
-        port.diff_text(
-            u'a\xac\u1234\u20ac\U00008000', 'act', 'exp.txt', 'act.txt')
-
-        # And make sure we actually get diff output.
-        diff = port.diff_text('foo', 'bar', 'exp.txt', 'act.txt')
-        self.assertIn('foo', diff)
-        self.assertIn('bar', diff)
-        self.assertIn('exp.txt', diff)
-        self.assertIn('act.txt', diff)
-        self.assertNotIn('nosuchthing', diff)
-
-        # Test for missing newline at end of file diff output.
-        content_a = "Hello\n\nWorld"
-        content_b = "Hello\n\nWorld\n\n\n"
-        expected = "--- exp.txt\n+++ act.txt\n@@ -1,3 +1,5 @@\n Hello\n \n-World\n\\ No newline at end of file\n+World\n+\n+\n"
-        self.assertEqual(expected, port.diff_text(content_a, content_b, 'exp.txt', 'act.txt'))
-
     def test_setup_test_run(self):
         port = self.make_port()
         # This routine is a no-op. We just test it for coverage.