[Feature Request] Insert dynamicVariables at mocked provider

[gabrieluizramos]

This PR updates MockedProvider test-link validation, inserting a new field dynamicVariables on the mockeds request array, such as:

const mocks = [{
  request: {
    query: myQuery
  },
  result: {
    data: {
      myQuery: {
        lead: {
          pk: 1
        },
        errors: [{
          field: 'email',
          message: 'beibe beibe do beibe do biruleibe leibe'
        }],
        success: false
      }
    }
  },
  dynamicVariables: true
}];

Providing an environment where dynamic variables are necessary in tests and storybooks using MockedProvider.

As opened issue 2466

[apollo-cla]

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[gabrieluizramos]

@hwillson Hi! Could help me with this PR (and Feature request), please? :)

[hwillson]

Thanks for submitting this PR @gabrieluizramos. Unfortunately, this isn't something we're able to accept at this time. The matching of exact variables that are being sent in via the request, with variables that have been defined in the mocked response, is intentional and isn't something we want to support a workaround for at this time. To achieve the same functionality you're looking for in
https://codesandbox.io/s/w27mz5r44w, can you not just drop the variables being sent into your this.props.mutate() call? This will have the same affect as your proposed dynamicVariables change. Thanks again!

[hwillson]

@gabrieluizramos We're interested in re-visiting this, so I'll re-open this PR. Instead of using the current dynamicVariables: true approach, we're considering allowing a variable matcher function to be set, that can be a bit more specific. We'll add some changes to this PR shortly - thanks for kickstarting things!

[gabrieluizramos]

@hwillson thank you for re-visiting this feature! I'm glad to help you guys 😄

[gabrieluizramos]

@hwillson Hi there! Do you think that this still interesting for you guys?