vi.fn - mrsekut-p

vi.fn

from VitestでMock

mock/spy的側面も、stub的側面も備えている

code:ts

const getApples = vi.fn(() => 0)

getApples()

expect(getApples).toHaveBeenCalled() // spy

expect(getApples).toHaveReturnedWith(0) // spy

getApples.mockReturnValueOnce(5) // stub

const res = getApples()

expect(res).toBe(5)

expect(getApples).toHaveNthReturnedWith(2, 5)