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grpc: retry: add test that exectures parallel requests #59490
Merged
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During https://github.com/sourcegraph/sourcegraph/pull/59487, we discovered that the existing test suite for the retry package doesn't execute any requests in parallel due to stretchr/testify#187.
This PR explicit adds some basic tests that execute Unary / Streaming requests to see if they trip the race detector.
Test plan
CI
I also opened this example PR to show how these tests would catch the issue in https://github.com/sourcegraph/sourcegraph/pull/59487: https://github.com/sourcegraph/sourcegraph/pull/59491