def test_replace_first_sentence(self):
        text = "First sentence. Second sentence."
        replacement = "Replaced sentence."
        result = compiler.replace_first_sentence(text, replacement)
        self.assertEqual(result, "Replaced sentence. Second sentence.")

        text = "First sentence."
        replacement = "Replaced sentence."
        result = compiler.replace_first_sentence(text, replacement)
        self.assertEqual(result, "Replaced sentence.")
    def test_replace_first_sentence(self):
        text = "First sentence. Second sentence."
        replacement = "Replaced sentence."
        result = compiler.replace_first_sentence(text, replacement)
        self.assertEqual(result, "Replaced sentence. Second sentence.")

        text = "First sentence."
        replacement = "Replaced sentence."
        result = compiler.replace_first_sentence(text, replacement)
        self.assertEqual(result, "Replaced sentence.")