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test: add failing test when using vi.spyOn #40

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test: add failing test when using vi.spyOn #40

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16 changes: 16 additions & 0 deletions test/vitest-when.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,22 @@ describe('vitest-when', () => {
expect(spy()).toEqual(100)
})

it('should fall back to original implementation when using vi.spyOn', () => {
const calculator = {
multiplyByTwo(n: number) {
return 2 * n;
}
}

const spy = vi.spyOn(calculator, 'multiplyByTwo');

expect(spy(2)).toEqual(4)

subject.when(spy).calledWith(1).thenReturn(4)
expect(spy(1)).toEqual(4)
expect(spy(2)).toEqual(4)
})

it('should fall back to original implementation after reset', () => {
const spy = vi.fn((n) => 2 * n)

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