context_test.py 文件源码

def test_context_is_dictionary_like():
    """Context should behave like a dictionary"""
    # initializes to empty
    d = Context()
    assert d is not None
    # len is not a given on custom implementations
    assert len(d) == 0

    # dict ctor "just works"
    d = Context({'k1': 'v1', 'k2': 'v2'})
    assert d
    assert len(d) == 2
    assert d['k1'] == 'v1'
    assert d['k2'] == 'v2'

    # __set_item__ assignment add and update works
    d['k1'] = 'value 1'
    d['k2'] = 'value 2'
    d['k3'] = ['one list', 'two list', 'three list']
    d['k4'] = {'kk1': 'vv1', 'kk2': 'vv2', 'kk3': 'vv3'}
    d['k5'] = True
    d['k6'] = ('thing', False, ['1', '2', '3'], 6)
    d['k7'] = 77

    assert d['k5']

    # isinstance resolves to dict - this test might become invalid if refactor
    # to a MutableMapping custom object
    assert isinstance(d, dict)
    assert isinstance(d, MutableMapping)
    assert len(d) == 7

    # items() can iterate
    for k, v in d.items():
        if k == 'k4':
            assert isinstance(v, dict)

        if k == 'k6':
            assert isinstance(v, tuple)

    # values() can iterate
    for v in d.values():
        assert v

    # __get_item__ works
    assert d['k1'] == 'value 1'

    # update merging works
    mergedic = {'k1': 'NEWVALUE'}
    d.update(mergedic)
    assert d['k1'] == 'NEWVALUE'

    # del and clear
    original_length = len(d)
    del d['k1']
    assert 'k1' not in d
    assert len(d) == original_length - 1

    d.clear()
    assert len(d) == 0