from collections import OrderedDict

from bleach.utils import alphabetize_attributes


class TestAlphabeticalAttributes:
    def test_empty_cases(self):
        assert alphabetize_attributes(None) is None

        assert alphabetize_attributes({}) == {}

    def test_ordering(self):
        assert (
            alphabetize_attributes({
                (None, 'a'): 1,
                (None, 'b'): 2
            }) ==
            OrderedDict([
                ((None, 'a'), 1),
                ((None, 'b'), 2)
            ])
        )
        assert (
            alphabetize_attributes({
                (None, 'b'): 1,
                (None, 'a'): 2}
            ) ==
            OrderedDict([
                ((None, 'a'), 2),
                ((None, 'b'), 1)
            ])
        )

    def test_different_namespaces(self):
        assert (
            alphabetize_attributes({
                ('xlink', 'href'): 'abc',
                (None, 'alt'): '123'
            }) ==
            OrderedDict([
                ((None, 'alt'), '123'),
                (('xlink', 'href'), 'abc')
            ])
        )