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fixture-initialization.test.ts
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fixture-initialization.test.ts
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import type { Use } from '@vitest/runner'
import { beforeEach, describe, expect, expectTypeOf, test, vi } from 'vitest'
interface Fixtures {
a: number
b: number
c: number
d: number
}
const fnB = vi.fn()
const myTest = test.extend<Pick<Fixtures, 'a' | 'b'>>({
a: 1,
b: async ({ a }, use) => {
fnB()
await use (a * 2) // 2
fnB.mockClear()
},
})
const fnA = vi.fn()
const fnB2 = vi.fn()
const fnC = vi.fn()
const fnD = vi.fn()
const myTest2 = myTest.extend<Pick<Fixtures, 'c' | 'd'> & { a: string; b: string }>({
// override origin a
a: async ({ a: originA }, use) => {
expectTypeOf(originA).toEqualTypeOf<number>()
fnA()
await use(String(originA)) // '1'
fnA.mockClear()
},
b: async ({ a }, use) => {
expectTypeOf(a).toEqualTypeOf<string>()
fnB2()
await use(String(Number(a) * 2)) // '2'
fnB2.mockClear()
},
c: async ({ a, b }, use) => {
expectTypeOf(b).toEqualTypeOf<string>()
fnC()
await use(Number(a) + Number(b)) // 3
fnC.mockClear()
},
d: async ({ a, b, c }, use) => {
fnD()
await use(Number(a) + Number(b) + c) // 6
fnD.mockClear()
},
})
describe('fixture initialization', () => {
describe('fixture override', () => {
myTest('origin a and b', ({ a, b }) => {
expect(a).toBe(1)
expect(b).toBe(2)
expectTypeOf(a).toEqualTypeOf<number>()
expectTypeOf(b).toEqualTypeOf<number>()
expect(fnB).toBeCalledTimes(1)
expect(fnB2).not.toBeCalled()
expect(fnA).not.toBeCalled()
expect(fnC).not.toBeCalled()
expect(fnD).not.toBeCalled()
})
myTest2('overriding a and b', ({ a, b }) => {
expect(a).toBe('1')
expect(b).toBe('2')
expectTypeOf(a).toEqualTypeOf<string>()
expectTypeOf(b).toEqualTypeOf<string>()
expect(fnA).toBeCalledTimes(1)
expect(fnB).toBeCalledTimes(1)
expect(fnB2).toBeCalledTimes(1)
expect(fnC).not.toBeCalled()
expect(fnD).not.toBeCalled()
})
})
myTest.runIf(true)('fixtures work with runIf', ({ a }) => {
expect(a).toBe(1)
})
myTest.skipIf(false)('fixtures work with skipIf', ({ a }) => {
expect(a).toBe(1)
})
describe('fixture dependency', () => {
myTest2('b => a', ({ b }) => {
expect(b).toBe('2')
expect(fnA).toBeCalledTimes(1)
expect(fnB).toBeCalledTimes(1)
expect(fnB2).toBeCalledTimes(1)
expect(fnC).not.toBeCalled()
expect(fnD).not.toBeCalled()
})
myTest2('c => [a, b]', ({ c }) => {
expect(c).toBe(3)
expect(fnA).toBeCalledTimes(1)
expect(fnB).toBeCalledTimes(1)
expect(fnB2).toBeCalledTimes(1)
expect(fnC).toBeCalledTimes(1)
expect(fnD).not.toBeCalled()
})
myTest2('d => c', ({ d }) => {
expect(d).toBe(6)
expect(fnA).toBeCalledTimes(1)
expect(fnB).toBeCalledTimes(1)
expect(fnB2).toBeCalledTimes(1)
expect(fnC).toBeCalledTimes(1)
expect(fnD).toBeCalledTimes(1)
})
myTest2('should only call once for each fixture fn', ({ a, b, c, d }) => {
expect(a).toBe('1')
expect(b).toBe('2')
expect(c).toBe(3)
expect(d).toBe(6)
expect(fnA).toBeCalledTimes(1)
expect(fnB).toBeCalledTimes(1)
expect(fnB2).toBeCalledTimes(1)
expect(fnC).toBeCalledTimes(1)
expect(fnD).toBeCalledTimes(1)
})
})
describe('fixture dependency', () => {
const myTest = test
.extend({ a: 1 })
.extend({
b: async ({ a }, use: Use<number>) => {
expectTypeOf(a).toEqualTypeOf<number>()
await use(a * 2)
},
})
myTest('b => a', ({ b }) => {
expectTypeOf(b).toEqualTypeOf<number>()
expect(b).toBe(2)
})
})
describe('fixture todos', () => {
const todos: number[] = []
const archive: number[] = []
const myTest = test.extend<{ todos: number[]; archive: number[] }>({
todos: async ({}, use) => {
// setup the fixture before each test function
todos.push(1, 2, 3)
// use the fixture value
await use(todos)
// cleanup the fixture after each test function
todos.length = 0
},
archive,
})
myTest('add items to todos', ({ todos }) => {
expect(todos.length).toBe(3)
todos.push(4)
expect(todos.length).toBe(4)
})
myTest('move items from todos to archive', ({ todos, archive }) => {
expect(todos.length).toBe(3)
expect(archive.length).toBe(0)
archive.push(todos.pop() as number)
expect(todos.length).toBe(2)
expect(archive.length).toBe(1)
})
})
describe('accessing non-fixture context', () => {
const myTest = test.extend({ a: 1 })
beforeEach(async ({ task }) => {
expect(task).toBeTruthy()
})
myTest('non-fixture context can be accessed without accessing fixtures', ({ task }) => {
expect(task).toBeTruthy()
})
})
})