MockedProvider seems not supported fragments

[kkh975]

Issue Description

Here is my test Code.

<MockedProvider mocks={[
  {
    request: {
      query: TEST_ANSWER,
      variables: {
        id: 's_901ea6cabd2a729',
      },
    },
    result: {
      data: {
        resp: {
          id: 's_901ea6cabd2a729',
          messages: [
            {
              type: 'TEXT',
              text: 'lorem....',
            },
            {
              type: 'Picture',
              path: 'https://...'
            },
          ],
        },
      },
    },
  },
]} addTypename={false}>
  <TempComp />
</MockedProvider>

and Gql Code.

query GetGraphQAnswer($id: String) {
  resp(id: $id) {
    id
    messages {
      ... on TextMessage {
        type
        text
      }
      ... on PictureMessage {
        type
        path
      }
    }
  }
}

but messages item is empty like below:

[ {}, {} ]

Link to Reproduction

none

Reproduction Steps

No response

@apollo/client version

3.12.4

[triagster]

Related issues:

• Using MockedProvider for tests, ... gql fragments not working #10953

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[phryneas]

You need to add __typename fields to your mocked response and enable addTypename - without knowing if your response is a TextMessage or PictureMessage, these fragments will not be applied to the cache, since they only apply for those types.

[kkh975]

@phryneas thanks!

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