fix: toHaveStyle assertion with invalid style (#564) #582
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Given an invalid declaration such as `fontSize: 8`, due to the missing
unit, the `toHaveStyle` matcher should not pass the following test:
```
render(<div data-testid="element" style={{ fontSize: 8 }} />)
expect(screen.getByTestId('element')).toHaveStyle({ fontSize: 1 })
```
This PR fixes testing-library#564 by adding a more restrictive guard in the matcher's
logic.
gnapse
approved these changes
Mar 4, 2024
| !computedStyle[name] && | ||
| !computedStyle.getPropertyValue(name) | ||
| ) | ||
| } |
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nit: keep blank line between function declarations:
Suggested change
| } | |
| } | |
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| function isInvalidStyleDeclaration(name, value, computedStyle) { | ||
| return ( | ||
| name && | ||
| !value && | ||
| !computedStyle[name] && | ||
| !computedStyle.getPropertyValue(name) | ||
| ) | ||
| } |
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It is not fully evident (to me at least) why this works. I'm not saying I doubt that it works, I'm saying that perhaps this function could use a jsdoc to explain what it does. Or at the very least can you share here the logic? Perhaps no comment is needed, and I'm just having trouble to understand it myself.
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What:
Given an invalid declaration such as
fontSize: 8, due to the missing unit, thetoHaveStylematcher should not pass the following test:Why:
Refer to the original issue for more info: #564
How:
This PR fixes #564 by adding a more restrictive guard in the matcher's logic.
Checklist: