Request: Container Matchers

[bpjatfb]

The current container matchers only cover list and dict (TestSlide docs). Unfortunately, this doesn't help much when I'm working with other containers or iterables (of which, Python has many!). I am proposing that we add matchers for arbitrary containers as well. Something like the following, although the names could probably be improved:

• AnyIterable: value is iterable
• AnyIterableContaining: asserts element exists in container/iterable
• AnyIterableContainingAll: asserts container/iterable contains all elements
• EmptyIterable: asserts container/iterable is empty

Example

Actual value (a dict of deque):

{
    'a': deque([1, 2, 3], maxlen=100),
    'b': deque([4, 5, 6], maxlen=100),
    'c': deque([7, 8, 9], maxlen=100),
}

Since maxlen=100 isn't a hard requirement, I don't really want to specify it in my test. It would be really great if I could test like so:

{
    'a': AnyIterableContainingAll([1, 2, 3]),
    'b': AnyIterableContainingAll([4, 5, 6]),
    'c': AnyIterableContainingAll([7, 8, 9]),
}

See also

• Google Test (C++) Container Matchers: https://github.com/google/googletest/blob/main/docs/reference/matchers.md#container-matchers
• Hamcrest (Java/multilanguage) contains: https://hamcrest.org/JavaHamcrest/javadoc/1.3/org/hamcrest/Matchers.html#contains(org.hamcrest.Matcher...)

[fornellas]

LPGTM @bpjatfb, how do you feel abotu cutting a PR to add these matches here and some tests here?

[bpjatfb]

how do you feel abotu cutting a PR to add these matches here and some tests here?

Thanks for the code pointers! I'll put together a PR for these.

[bpjatfb]

Fixed by #350