RFC: Schema-driven testing about apollo-client HOT 6 CLOSED

This is awesome, really excited to have first-party tools for this! I published a post about a similar approach back when we were introducing GraphQL at Stripe: https://www.freecodecamp.org/news/a-new-approach-to-mocking-graphql-data-1ef49de3d491/

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I love the idea, but one thing to consider is how this will scale for companies with huge company-wide schemas. For example, Indeed's schema at present contains over 7000 types and 24000 fields. If a developer were to download that and feed that into createMockSchema I would expect it to be quite slow, especially if this were executed in a test setup function. In order for this to be performant I see two possible approaches.

1. The createMockSchema implementation would need implement it's own internal caching mechanism so that the full schema file does not need to be parsed each time.
2. Implement some sort of schema pruning utility to limit the schema to just the types the unit and integration tests care about. This pruned schema could be built once and reused for all subsequent tests.

Without an elegant way to handle huge schemas I fear that developers will resort to hand rolling their own pruned versions of schemas for the purpose of testing, which will create the new problem of keeping those pruned schemas in sync with the real schema.

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@qswitcher that's a great call out! I need to do some testing with much larger schemas - I suspect caching will allow us to achieve the performance we need, but a schema pruning utility is an interesting idea, too. Totally agree we need to avoid a scenario where developers are having to maintain their own condensed version of the schema - thanks for the feedback!

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Hey everyone 👋

Last week we released v3.10 with new experimental testing APIs! Please see the documentation for more information.

There's also a new pinned issue #11817 where we'd love to hear your feedback. Looking forward to hearing about what's working well and what can be improved. Thanks!

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