/
themeFunction.test.js
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/
themeFunction.test.js
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import postcss from 'postcss'
import plugin from '../src/lib/evaluateTailwindFunctions'
function run(input, opts = {}) {
return postcss([plugin(opts)]).process(input, { from: undefined })
}
test('it looks up values in the theme using dot notation', () => {
const input = `
.banana { color: theme('colors.yellow'); }
`
const output = `
.banana { color: #f7cc50; }
`
return run(input, {
theme: {
colors: {
yellow: '#f7cc50',
},
},
}).then((result) => {
expect(result.css).toEqual(output)
expect(result.warnings().length).toBe(0)
})
})
test('quotes are optional around the lookup path', () => {
const input = `
.banana { color: theme(colors.yellow); }
`
const output = `
.banana { color: #f7cc50; }
`
return run(input, {
theme: {
colors: {
yellow: '#f7cc50',
},
},
}).then((result) => {
expect(result.css).toEqual(output)
expect(result.warnings().length).toBe(0)
})
})
test('a default value can be provided', () => {
const input = `
.cookieMonster { color: theme('colors.blue', #0000ff); }
`
const output = `
.cookieMonster { color: #0000ff; }
`
return run(input, {
theme: {
colors: {
yellow: '#f7cc50',
},
},
}).then((result) => {
expect(result.css).toEqual(output)
expect(result.warnings().length).toBe(0)
})
})
test('the default value can use the theme function', () => {
const input = `
.cookieMonster { color: theme('colors.blue', theme('colors.yellow')); }
`
const output = `
.cookieMonster { color: #f7cc50; }
`
return run(input, {
theme: {
colors: {
yellow: '#f7cc50',
},
},
}).then((result) => {
expect(result.css).toEqual(output)
expect(result.warnings().length).toBe(0)
})
})
test('quotes are preserved around default values', () => {
const input = `
.heading { font-family: theme('fontFamily.sans', "Helvetica Neue"); }
`
const output = `
.heading { font-family: "Helvetica Neue"; }
`
return run(input, {
theme: {
fontFamily: {
serif: 'Constantia',
},
},
}).then((result) => {
expect(result.css).toEqual(output)
expect(result.warnings().length).toBe(0)
})
})
test('an unquoted list is valid as a default value', () => {
const input = `
.heading { font-family: theme('fontFamily.sans', Helvetica, Arial, sans-serif); }
`
const output = `
.heading { font-family: Helvetica, Arial, sans-serif; }
`
return run(input, {
theme: {
fontFamily: {
serif: 'Constantia',
},
},
}).then((result) => {
expect(result.css).toEqual(output)
expect(result.warnings().length).toBe(0)
})
})
test('a missing root theme value throws', () => {
const input = `
.heading { color: theme('colours.gray.100'); }
`
return expect(
run(input, {
theme: {
colors: {
yellow: '#f7cc50',
},
},
})
).rejects.toThrowError(
`'colours.gray.100' does not exist in your theme config. Your theme has the following top-level keys: 'colors'`
)
})
test('a missing nested theme property throws', () => {
const input = `
.heading { color: theme('colors.red'); }
`
return expect(
run(input, {
theme: {
colors: {
blue: 'blue',
yellow: '#f7cc50',
},
},
})
).rejects.toThrowError(
`'colors.red' does not exist in your theme config. 'colors' has the following valid keys: 'blue', 'yellow'`
)
})
test('a missing nested theme property with a close alternative throws with a suggestion', () => {
const input = `
.heading { color: theme('colors.yellw'); }
`
return expect(
run(input, {
theme: {
colors: {
yellow: '#f7cc50',
},
},
})
).rejects.toThrowError(
`'colors.yellw' does not exist in your theme config. Did you mean 'colors.yellow'?`
)
})
test('a path through a non-object throws', () => {
const input = `
.heading { color: theme('colors.yellow.100'); }
`
return expect(
run(input, {
theme: {
colors: {
yellow: '#f7cc50',
},
},
})
).rejects.toThrowError(
`'colors.yellow.100' does not exist in your theme config. 'colors.yellow' is not an object.`
)
})
test('a path which exists but is not a string throws', () => {
const input = `
.heading { color: theme('colors.yellow'); }
`
return expect(
run(input, {
theme: {
colors: {
yellow: Symbol(),
},
},
})
).rejects.toThrowError(`'colors.yellow' was found but does not resolve to a string.`)
})
test('a path which exists but is invalid throws', () => {
const input = `
.heading { color: theme('colors'); }
`
return expect(
run(input, {
theme: {
colors: {},
},
})
).rejects.toThrowError(`'colors' was found but does not resolve to a string.`)
})
test('a path which is an object throws with a suggested key', () => {
const input = `
.heading { color: theme('colors'); }
`
return expect(
run(input, {
theme: {
colors: {
yellow: '#f7cc50',
},
},
})
).rejects.toThrowError(
`'colors' was found but does not resolve to a string. Did you mean something like 'colors.yellow'?`
)
})
test('array values are joined by default', () => {
const input = `
.heading { font-family: theme('fontFamily.sans'); }
`
const output = `
.heading { font-family: Inter, Helvetica, sans-serif; }
`
return run(input, {
theme: {
fontFamily: {
sans: ['Inter', 'Helvetica', 'sans-serif'],
},
},
}).then((result) => {
expect(result.css).toEqual(output)
expect(result.warnings().length).toBe(0)
})
})
test('font sizes are retrieved without default line-heights or letter-spacing', () => {
const input = `
.heading-1 { font-size: theme('fontSize.lg'); }
.heading-2 { font-size: theme('fontSize.xl'); }
`
const output = `
.heading-1 { font-size: 20px; }
.heading-2 { font-size: 24px; }
`
return run(input, {
theme: {
fontSize: {
lg: ['20px', '28px'],
xl: ['24px', { lineHeight: '32px', letterSpacing: '-0.01em' }],
},
},
}).then((result) => {
expect(result.css).toMatchCss(output)
expect(result.warnings().length).toBe(0)
})
})
test('outlines are retrieved without default outline-offset', () => {
const input = `
.element { outline: theme('outline.black'); }
`
const output = `
.element { outline: 2px dotted black; }
`
return run(input, {
theme: {
outline: {
black: ['2px dotted black', '4px'],
},
},
}).then((result) => {
expect(result.css).toMatchCss(output)
expect(result.warnings().length).toBe(0)
})
})
test('font-family values are joined when an array', () => {
const input = `
.element { font-family: theme('fontFamily.sans'); }
`
const output = `
.element { font-family: Helvetica, Arial, sans-serif; }
`
return run(input, {
theme: {
fontFamily: {
sans: ['Helvetica', 'Arial', 'sans-serif'],
},
},
}).then((result) => {
expect(result.css).toMatchCss(output)
expect(result.warnings().length).toBe(0)
})
})
test('box-shadow values are joined when an array', () => {
const input = `
.element { box-shadow: theme('boxShadow.wtf'); }
`
const output = `
.element { box-shadow: 0 0 2px black, 1px 2px 3px white; }
`
return run(input, {
theme: {
boxShadow: {
wtf: ['0 0 2px black', '1px 2px 3px white'],
},
},
}).then((result) => {
expect(result.css).toMatchCss(output)
expect(result.warnings().length).toBe(0)
})
})
test('transition-property values are joined when an array', () => {
const input = `
.element { transition-property: theme('transitionProperty.colors'); }
`
const output = `
.element { transition-property: color, fill; }
`
return run(input, {
theme: {
transitionProperty: {
colors: ['color', 'fill'],
},
},
}).then((result) => {
expect(result.css).toMatchCss(output)
expect(result.warnings().length).toBe(0)
})
})
test('transition-duration values are joined when an array', () => {
const input = `
.element { transition-duration: theme('transitionDuration.lol'); }
`
const output = `
.element { transition-duration: 1s, 2s; }
`
return run(input, {
theme: {
transitionDuration: {
lol: ['1s', '2s'],
},
},
}).then((result) => {
expect(result.css).toMatchCss(output)
expect(result.warnings().length).toBe(0)
})
})