Multi byte character method name is garbled

[kannkyo]

issue

When use unicode in test method,

    def test_あいうえお(self):
        print('かきくけこ')

I got garbled text (mojibake) in html reports.

test_�����

reason

Method name ( report.nodeid ) is encoded as utf-8 and decoded as unicode_escape .

src/pytest_html/result.py

        self.test_id = report.nodeid.encode("utf-8").decode("unicode_escape")

Multi byte character as utf-8 is different same one as unicode_escape.

>>> print('abcdeあいうえお'.encode("utf-8"))
b'abcde\xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a'
>>> print('abcdeあいうえお'.encode("unicode_escape"))
b'abcde\\u3042\\u3044\\u3046\\u3048\\u304a'