def test_grep_if_exists_MultiLineRegexMatch(self):
        t1 = "ap\nple"

        self.args.regex = "p.p"
        app = GrepChunksApp(self.args)

        self.assertEqual(t1, app._grep_if_exists(t1))
    def test_grep_if_exists_RegexNotMatch(self):
        t1 = "apple"

        self.args.regex = "aa"
        app = GrepChunksApp(self.args)

        self.assertIsNone(app._grep_if_exists(t1))