Support Mock Matching using Post Body

[hecktarzuli]

Scope

Improves an existing behavior

Compatibility

• This is a breaking change

Feature description

It's great we can mock a REST endpoint with .post(). The problem is, with rest APIs, different post payloads to a given url may return different responses.

It would be really nice if rest.post() accepted an object (or something) where we could declare separate mocks for both a url AND payload. Currently we have to put all of the matching and splitting logic within the 1 mock handler.

[kettanaito]

Hi, @hecktarzuli.

Please take a look at a similar question about matching against request query parameters: #1315 (comment). The approach to implementing the match against the request body will be quite the same (here's a more relevant comment on the topic #1315 (comment)).

MSW provides a versatile API for you to implement such a helper utility and use across your request handlers. This is not something we will ship out of the box.