test_textwrap.py 文件源码

def test_indent_empty_lines(self):
        # Add 'prefix' solely to whitespace-only lines.
        prefix = '  '
        expected = (
          # Basic test case
          "Hi.\nThis is a test.\nTesting.",
          # Include a blank line
          "Hi.\nThis is a test.\n  \nTesting.",
          # Include leading and trailing blank lines
          "  \nHi.\nThis is a test.\nTesting.\n",
          # Use Windows line endings
          "Hi.\r\nThis is a test.\r\nTesting.\r\n",
          # Pathological case
          "  \nHi.\r\nThis is a test.\n  \r\nTesting.\r\n  \n",
        )
        predicate = lambda line: not line.strip()
        for text, expect in zip(self.CASES, expected):
            self.assertEqual(indent(text, prefix, predicate), expect)