def test_wrong_extension_type(self):
    exts = [dict(), False, True, [], 123]
    expected = ''
    for ext in exts:
        got = get_extension(ext)
        assert (expected == got)
def test_wrong_extension_type(self):
    exts = [dict(), False, True, [], 123]
    expected = 
    for ext in exts:
        got = get_extension(ext)
        assert (expected == got)