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27 lines
843 B
JavaScript
27 lines
843 B
JavaScript
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/** @license https://github.com/facebook/jest/blob/master/LICENSE */
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function forEach(items, callback) {
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for (let index = 0; index < items.length; index++) {
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callback(items[index]);
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}
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}
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const mockCallback = jest.fn((x) => 42 + x);
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forEach([0, 1], mockCallback);
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test("このモック関数は2回呼ばれます", () => {
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expect(mockCallback.mock.calls.length).toBe(2);
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});
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test("このモック関数の最初の呼び出しのときの第1引数はゼロです", () => {
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expect(mockCallback.mock.calls[0][0]).toBe(0);
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});
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test("このモック関数の2回目の呼び出しのときの第1引数は1です", () => {
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expect(mockCallback.mock.calls[1][0]).toBe(1);
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});
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test("このモック関数の最初の呼び出しのときの戻り値は42です", () => {
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expect(mockCallback.mock.results[0].value).toBe(42);
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});
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