7 examples of 'jest mock once' in JavaScript

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22export function mockResolvedValueOnce(mock, value) {
23 mock.mockImplementationOnce(
24 () =>
25 new Promise(resolve => {
26 process.nextTick(() => resolve(value))
27 })
28 )
29}
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76get called() {
77 return this.callCount > 0;
78}
13SourceGroupsManager: jest.fn().mockImplementation(function mock() {
14 this.setImportStatus = jest.fn();
15 this.findByImportId = jest.fn();
16}),
4getSpy() {
5 return jest.fn();
6}
4export function mock(callbacks) {
5 if (consoleBak) {
6 // Can only mock console once before restore it.
7 return false;
8 }
9
10 consoleBak = {};
11
12 for (const property in callbacks) {
13 if (callbacks.hasOwnProperty(property)) {
14 consoleBak[property] = console[property];
15 console[property] = callbacks[property];
16 }
17 }
18
19 return true;
20}
48export function toHaveBeenCalledOnceWith({actual, callCount, equals, argsFor}, ...args) {
49 const count = callCount(actual) || 0;
50 const wasCalledOnce = count === 1;
51 const ok = wasCalledOnce && equals(argsFor(actual, 0), args);
52 const msg = wasCalledOnce && !ok ? ' with different arguments' : '';
53
54 return {
55 pass: ok,
56 message() {
57 return `Expect ${pp(actual)} {{not}} to have been called once but was called ${pp(count)} time(s)${msg}`;
58 },
59 };
60}
167export function laterMock(
168 createStream: <U>(...timeline: Timeline<U>) => Stream<U>,
169) {
170 return function later<T>(time: number, value?: T): Stream<T> {
171 return createStream(t(time), v(value as any))
172 }
173}

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