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maxDiffPixels vs maxDiffPixelRatio in toHaveScreenshot, who has priority?

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danielnpuposted in #help-playwright
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danielnpu

Hi everyone! A quick question. When both maxDiffPixels and maxDiffPixelRatio are used in toHaveScreenshot, one from playwright test config, the other directly used as parameter of toHaveScreenshot's option, which one takes effect, the one in code, or the one in config, or both?

This thread is trying to answer question "When both maxDiffPixels and maxDiffPixelRatio are used in toHaveScreenshot, one from playwright test config, the other directly used as parameter of toHaveScreenshot's option, which one takes effect, the one in code, or the one in config, or both?"

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gregberge
gregberge

Both are actually used:

https://github.com/microsoft/playwright/blob/62b6af3a7f67b08e6588699a49753b7ed3f1e3df/packages/playwright-core/src/utils/comparators.ts#L86C30-L86C30

It takes the minimal value.

About the merging of config I am not sure, but if it merges global config and local options then both are used.

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