mirror of
https://github.com/kou029w/jest-hands-on.git
synced 2025-02-01 06:08:38 +00:00
27 lines
843 B
JavaScript
27 lines
843 B
JavaScript
|
/** @license https://github.com/facebook/jest/blob/master/LICENSE */
|
||
|
|
|
||
|
|
function forEach(items, callback) {
|
||
|
|
for (let index = 0; index < items.length; index++) {
|
||
|
|
callback(items[index]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const mockCallback = jest.fn((x) => 42 + x);
|
||
|
|
forEach([0, 1], mockCallback);
|
||
|
|
|
||
|
|
test("このモック関数は2回呼ばれます", () => {
|
||
|
|
expect(mockCallback.mock.calls.length).toBe(2);
|
||
|
|
});
|
||
|
|
|
||
|
|
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", () => {
|
||
|
|
expect(mockCallback.mock.calls[0][0]).toBe(0);
|
||
|
|
});
|
||
|
|
|
||
|
|
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", () => {
|
||
|
|
expect(mockCallback.mock.calls[1][0]).toBe(1);
|
||
|
|
});
|
||
|
|
|
||
|
|
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", () => {
|
||
|
|
expect(mockCallback.mock.results[0].value).toBe(42);
|
||
|
|
});
|