1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
// Frida Kahlo's birthday (6 = July)
export const DEFAULT_ARGS = [2020, 6, 6];
const RealDate = Date;
const isMocked = (val) => Boolean(val.mock);
export const createFakeDateClass = (ctorDefault) => {
const FakeDate = new Proxy(RealDate, {
construct: (target, argArray) => {
const ctorArgs = argArray.length ? argArray : ctorDefault;
return new RealDate(...ctorArgs);
},
apply: (target, thisArg, argArray) => {
const ctorArgs = argArray.length ? argArray : ctorDefault;
return new RealDate(...ctorArgs).toString();
},
// We want to overwrite the default 'now', but only if it's not already mocked
get: (target, prop) => {
if (prop === 'now' && !isMocked(target[prop])) {
return () => new RealDate(...ctorDefault).getTime();
}
return target[prop];
},
getPrototypeOf: (target) => {
return target.prototype;
},
// We need to be able to set props so that `jest.spyOn` will work.
set: (target, prop, value) => {
// eslint-disable-next-line no-param-reassign
target[prop] = value;
return true;
},
});
return FakeDate;
};
export const useFakeDate = (...args) => {
const FakeDate = createFakeDateClass(args.length ? args : DEFAULT_ARGS);
global.Date = FakeDate;
};
export const useRealDate = () => {
global.Date = RealDate;
};
|
