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@pacote/jest-either
Advanced tools
Additional matchers for Jest making it easier to test Either
objects.
yarn add @pacote/jest-either
import matchers from '@pacote/jest-either'
expect.extend(matchers)
.toBeEither()
import { left, right } from 'fp-ts/lib/Either'
test('passes when value is an Either', () => {
expect(left(true)).toBeEither()
expect(right(true)).toBeEither()
})
test('passes when value is not an Either', () => {
expect(undefined).not.toBeEither()
})
.toBeRight()
import { left, right } from 'fp-ts/lib/Either'
test('passes when Either is a right', () => {
const actual = right({ test: 'ok' })
expect(actual).toBeRight()
})
test('passes when Either is a left', () => {
const actual = left(Error())
expect(actual).not.toBeRight()
})
.toBeLeft()
import { left, right } from 'fp-ts/lib/Either'
test('passes when Either is a left', () => {
const actual = left(Error())
expect(actual).toBeLeft()
})
test('passes when Either is a right', () => {
const actual = right({ test: 'ok' })
expect(actual).not.toBeLeft()
})
.toEqualRight(value)
import { right } from 'fp-ts/lib/Either'
test('passes when right of Either equals a value', () => {
const actual = right({ test: 'ok' })
expect(actual).toEqualRight({ test: 'ok' })
})
test('passes when right of Either does not equal a value', () => {
const actual = right({ test: 'unexpected' })
expect(actual).not.toEqualRight({ test: 'ok' })
})
.toEqualLeft(value)
import { left } from 'fp-ts/lib/Either'
test('passes when left of Either equals a value', () => {
const actual = left(Error('message'))
expect(actual).toEqualLeft(Error('message'))
})
test('passes when left of Either does not equal a value', () => {
const actual = left(Error('unexpected'))
expect(actual).not.toEqualLeft(Error('message'))
})
.toMatchRight(object)
import { right } from 'fp-ts/lib/Either'
test('passes when right of Either matches an object', () => {
const actual = right({ test: 'ok', foo: 'bar' })
expect(actual).toMatchRight({ test: 'ok' })
})
test('passes when right of Either does not match an object', () => {
const actual = right({ test: 'unexpected', foo: 'bar' })
expect(actual).not.toMatchRight({ test: 'ok' })
})
.toMatchLeft(object)
import { left } from 'fp-ts/lib/Either'
test('passes when left of Either matches an object', () => {
const actual = left({ test: 'ok', foo: 'bar' })
expect(actual).toMatchLeft({ test: 'ok' })
})
test('passes when left of Either does not match an object', () => {
const actual = left({ test: 'unexpected', foo: 'bar' })
expect(actual).not.toMatchLeft({ test: 'ok' })
})
MIT © Luís Rodrigues.
FAQs
Jest matcher for Either objects.
We found that @pacote/jest-either demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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