def test_find_csv_edge(self):
        """This function tests that an exception is raised if the function is passed
        the wrong file extension
        """

        self.assertRaises(Exception,
                          mv.find_csv_filenames(mv.data_path, ".html"))
    def test_find_csv_2(self):
        """This function tests that the function returns the corrcet filename"""

        if not os.path.isdir("movie_analysis/tests/test1"):
            os.mkdir("movie_analysis/tests/test1")
        f = open("movie_analysis/tests/test1/testing.csv", "w+")
        f.close()
        self.assertTrue(
            mv.find_csv_filenames("movie_analysis/tests/test1", ".csv"),
            ["testing.csv"])
    def test_find_csv_oneshot(self):
        """This function tests that the list of filenames returned is not empty"""

        self.assertFalse(
            len(mv.find_csv_filenames(mv.data_path, suffix=".csv")) == 0)