def test_newlines_compressed_in_single_write(self):
        output = six.StringIO()
        tidy_writer = TidyWriter(output)

        tidy_writer.write("test stuff\n\n\ntest\n")
        tidy_writer.close()

        self.assertEqual("test stuff\n\ntest\n", output.getvalue())

    def test_compression_preserves_a_single_blank_line(self):
        output = six.StringIO()
        tidy_writer = TidyWriter(output)

        tidy_writer.write("test stuff\n\ntest\n")
        tidy_writer.close()

        self.assertEqual("test stuff\n\ntest\n", output.getvalue())

    def test_just_newlines_compressed_to_one(self):
        output = six.StringIO()
        tidy_writer = TidyWriter(output)

        tidy_writer.write("\n\n\n\n")
        tidy_writer.close()

        self.assertEqual("\n", output.getvalue())

    def test_newline_preserved_on_eof(self):
        output = six.StringIO()
        tidy_writer = TidyWriter(output)

        tidy_writer.write("a line\n")
        tidy_writer.write("another line\n")
        tidy_writer.close()

        self.assertEqual("a line\nanother line\n", output.getvalue())

    def test_newline_added_to_eof(self):
        output = StringIO()
        tidy_writer = TidyWriter(output)

        tidy_writer.write("a line\n")
        tidy_writer.write("another line")
        tidy_writer.close()

        self.assertEquals("a line\nanother line\n", output.getvalue())

    def test_newlines_compressed_across_writes(self):
        output = six.StringIO()
        tidy_writer = TidyWriter(output)

        tidy_writer.write("test stuff\n\n")
        tidy_writer.write("\ntest\n")
        tidy_writer.close()

        self.assertEqual("test stuff\n\ntest\n", output.getvalue())

        # now try the other split
        output = six.StringIO()
        tidy_writer = TidyWriter(output)

        tidy_writer.write("test stuff\n")
        tidy_writer.write("\n\ntest\n")
        tidy_writer.close()

        self.assertEqual("test stuff\n\ntest\n", output.getvalue())