How to use the pykakasi.K2a function in pykakasi

def test_K2a(self):

        TESTS = [
            ("カンタン",   ("ka", 1)),
            ("ニャ", ("nya",2)),
            ("ッキ", ("kki",2)),
            ("ッファ", ("ffa", 3)),
            ("シツモン",   ("shi", 1)),
            ("チガイ",  ("chi", 1)),
            ("ジ", ("ji",1)),
        ]

        h = pykakasi.K2a()
        for case, result in TESTS:
            self.assertEqual(h.convert(case), result)

("ジー", ("zi", 1)),
            ("ウォークマン", ("u", 1)),
            ("キャ", ("kya", 2)), ("キュ", ("kyu", 2)), ("キョ", ("kyo", 2)),
            ("シャ", ("sya", 2)), ("シュ", ("syu", 2)), ("ショ", ("syo", 2)),
            ("チャ", ("tya", 2)), ("チュ", ("tyu", 2)), ("チョ", ("tyo", 2)),
            ("ニャ", ("nya", 2)), ("ニュ", ("nyu", 2)), ("ニョ", ("nyo", 2)),
            ("リャ", ("rya", 2)), ("リュ", ("ryu", 2)), ("リョ", ("ryo", 2)),
            ("ザ", ("za", 1)), ("ジ", ("zi", 1)), ("ズ", ("zu", 1)),
            ("ゼ", ("ze", 1)), ("ゾ", ("zo", 1)),
            ("ダ", ("da", 1)), ("ヂ", ("zi", 1)), ("ヅ", ("zu", 1)),
            ("デ", ("de", 1)), ("ド", ("do", 1)),
            ("タ", ("ta", 1)), ("チ", ("ti", 1)), ("ツ", ("tu", 1)),
            ("テ", ("te", 1)), ("ト", ("to", 1))
        ]

        h = pykakasi.K2a(method="Kunrei")
        for case, result in TESTS:
            self.assertEqual(h.convert(case), result)