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Allow Deno to clean up leaked test resources #65

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@spawnia

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@spawnia

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SHOULD use 4xx or 5xx status codes on document validation failure when accepting application/graphql-response+json => ./test.ts:9:8
error: AssertionError: Test case is leaking 1 resource:

 - A fetch response body (rid 380) was created during the test, but not consumed during the test. Consume or close the response body `ReadableStream`, e.g `await resp.text()` or `await resp.body.cancel()`.

    at assert (ext:deno_web/00_infra.js:353:11)
    at resourceSanitizer (ext:cli/40_testing.js:417:5)
    at async Object.exitSanitizer [as fn] (ext:cli/40_testing.js:435:7)
    at async runTest (ext:cli/40_testing.js:840:5)
    at async runTests (ext:cli/40_testing.js:1098:20)

Expected Behaviour

It should be possible to use the server audits in Deno.test() in a way that does not leak resources.

Actual Behaviour

As discussed in #63 (comment), the tests leak resources.
I am not sure why, but the fix I added to the PR now does not work (fully) in my project.

Debug Information

The following run shows what happens without any cleanup: https://github.com/nuwave/lighthouse/actions/runs/4488866245/jobs/7893989167.

With a cleanup step, some portion of the tests is fixed (I think the failing ones), but others still leak: https://github.com/nuwave/lighthouse/actions/runs/4488817464/jobs/7893880714.

Further Information

Here is the link to the PR where I try to run the audit in my project: nuwave/lighthouse#2359.

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