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Using XUnit Theory with Snapper

To test my GraphQL schema I first used SnapShooter.

From the documentation:

Snapshooter is a flexible .Net testing tool, which can be used to validate all your test results with one single assert. It creates simply a snapshot of your test result object and stores it on the file system. If the test is executed again, the test result will be compared with the stored snapshot. If the snapshot matches to the test result, the test will pass.

It is really a good fit to test your GraphQL API. Unfortunately I got into trouble when I tried to combine it with XUnit Theory. I had created 1 tests that loaded multiple graphql files and validates them:

This didn’t work as expected because the same snapshot is used for every test run. As a consequence it fails when the same test runs again with a different parameter value .

Probably there is a way to fix it, but I was lazy so I took a look online and found Snapper, which offers similar features as SnapShooter but supports the XUnit Theory functionality through a feature called child snapshots. Let’s update our example:

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