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How to use test_is_subset_of_failure_array method in assertpy

Best Python code snippet using assertpy_python

test_collection.py

...65    assert_that('foo').is_subset_of('abcdef', set(['m','n','o']), ['x','y'])66    assert_that(set([1,2,3])).is_subset_of(set([1,2,3,4]))67    assert_that({'a':1,'b':2}).is_subset_of({'a':1,'b':2,'c':3})68    assert_that({'a':1,'b':2}).is_subset_of({'a':3}, {'b':2}, {'a':1})69def test_is_subset_of_failure_array():70    try:71        assert_that(['a','b','c']).is_subset_of(['a','b'])72        fail('should have raised error')73    except AssertionError as ex:74        assert_that(str(ex)).contains('but <c> was missing.')75def test_is_subset_of_failure_set():76    try:77        assert_that(set([1,2,3])).is_subset_of(set([1,2]))78        fail('should have raised error')79    except AssertionError as ex:80        assert_that(str(ex)).contains('but <3> was missing.')81def test_is_subset_of_failure_string():82    try:83        assert_that('abc').is_subset_of('abx')...

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