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Generic Profiling story to wrap any component #5341

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merged 30 commits into from May 15, 2024

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lucasbordeau
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@lucasbordeau lucasbordeau commented May 8, 2024

This PR introduces a Profiling feature for our story book tests.

It also implements a new CI job : front-sb-test-performance, that only runs stories suffixed with .perf.stories.tsx

How it works

It allows to wrap any component into an array of React Profiler components that will run tests many times to have the most replicable average render time possible.

It is simply used by calling the new getProfilingStory util.

Internally it creates a defined number of tests, separated by an arbitrary waiting time to allow the CPU to give more stable results.

It will do 3 warm-up and 3 finishing runs of tests because the first and last renders are always a bit erratic, so we want to measure only the runs in-between.

On the UI side it gives a table of results :

image

On the programmatic side, it stores the result in a div that can then be parsed by the play fonction of storybook, to expect a defined threshold.

play: async ({ canvasElement }) => {
    await findByTestId(
      canvasElement,
      'profiling-session-finished',
      {},
      { timeout: 60000 },
    );

    const profilingReport = getProfilingReportFromDocument(canvasElement);

    if (!isDefined(profilingReport)) {
      return;
    }

    const p95result = profilingReport?.total.p95;

    expect(
      p95result,
      `Component render time is more than p95 threshold (${p95ThresholdInMs}ms)`,
    ).toBeLessThan(p95ThresholdInMs);
  },

@lucasbordeau lucasbordeau changed the title Working generic Profiling story to wrap any component Generic Profiling story to wrap any component May 8, 2024
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@charlesBochet charlesBochet left a comment

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Very nice! Could you just fix the failing sb test?

@lucasbordeau lucasbordeau merged commit cfacdfc into main May 15, 2024
11 of 12 checks passed
@lucasbordeau lucasbordeau deleted the feat/add-storybook-performance-test branch May 15, 2024 11:50
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2 participants