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fix: toHaveStyle assertion with invalid style (#564) #582

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fix: toHaveStyle assertion with invalid style (#564) #582

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fd3089f
fix: toHaveStyle assertion with invalid style (#564)
EduardoSimon Feb 16, 2024
fc7d9b7
chore: style suggestion applied
EduardoSimon Oct 12, 2024
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9 changes: 9 additions & 0 deletions src/__tests__/to-have-style.js
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Original file line number Diff line number Diff line change
Expand Up @@ -215,6 +215,15 @@ describe('.toHaveStyle', () => {
})
})

test('correctly matches invalid properties', () => {
const {queryByTestId} = render(`
<div data-testid="element" style="fontSize: 8" />
`)
expect(queryByTestId('element')).not.toHaveStyle({
fontSize: 1,
})
})

test('Fails with an invalid unit', () => {
const {queryByTestId} = render(`
<span data-testid="color-example" style="font-size: 12rem">Hello World</span>
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22 changes: 18 additions & 4 deletions src/to-have-style.js
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,15 @@ function getStyleDeclaration(document, css) {
return styles
}

function isInvalidStyleDeclaration(name, value, computedStyle) {
return (
name &&
!value &&
!computedStyle[name] &&
!computedStyle.getPropertyValue(name)
)
}
Comment on lines +17 to +24
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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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Good point! Actually getting it to work was a bit tricky, so a comment would not harm.


function isSubset(styles, computedStyle) {
return (
!!Object.keys(styles).length &&
Expand All @@ -22,11 +31,16 @@ function isSubset(styles, computedStyle) {
const spellingVariants = [prop]
if (!isCustomProperty) spellingVariants.push(prop.toLowerCase())

return spellingVariants.some(
name =>
return spellingVariants.some(name => {
if (isInvalidStyleDeclaration(name, value, computedStyle)) {
return false
}

return (
computedStyle[name] === value ||
computedStyle.getPropertyValue(name) === value,
)
computedStyle.getPropertyValue(name) === value
)
})
})
)
}
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