Tests & QA19 categories

Diagnose this failing test

A red test with an unhelpful failure output.

Mediumdebuggingdiagnosis

This test fails and I do not know why. Before suggesting a fix, tell me what the test believes about the code, which of those beliefs the failure contradicts, and the two checks that would tell them apart. Diagnosis first, fix afterwards.

Test:


Failure output:

Making it yours

Paste your own material where the prompt asks for it. Everything above that line is instruction, not content.
Delete any rule that does not apply to you. A shorter prompt that fits beats a thorough one that does not.
If the answer comes back vague, add a line saying what you do not want. Constraints work better than encouragement.

Failing and flaky tests. Diagnosing a red run, stabilising a flake, and locking a fixed bug in with a regression test.

Related prompts

Make this flaky test deterministicA test that passes locally and fails in CI roughly one run in ten.Write a regression test from a bug reportA bug is fixed and you want it to stay fixed.Diagnose why this test is failingA red test where the failure output does not point anywhere obvious.Why is this flaky?A test that fails once every twenty runs.Write the failing case firstA bug you are about to fix.Regression test from this bugA bug you have just fixed and never want back.

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