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refactor(date): Use Jest fake timers (#21631)
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Original file line number | Diff line number | Diff line change |
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@@ -1,49 +1,56 @@ | ||
import { DateTime } from 'luxon'; | ||
import { | ||
getElapsedDays, | ||
getElapsedHours, | ||
getElapsedMinutes, | ||
getElapsedMs, | ||
} from './date'; | ||
|
||
const ONE_MINUTE_MS = 60 * 1000; | ||
const ONE_HOUR_MS = 60 * ONE_MINUTE_MS; | ||
const ONE_DAY_MS = 24 * ONE_HOUR_MS; | ||
|
||
describe('util/date', () => { | ||
const Jan1 = new Date(new Date().getFullYear(), 0, 1); | ||
const t0 = DateTime.fromISO('2020-10-10'); | ||
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||
beforeAll(() => { | ||
jest.useFakeTimers(); | ||
}); | ||
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||
beforeEach(() => { | ||
jest.setSystemTime(t0.toMillis()); | ||
}); | ||
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it('returns elapsed days', () => { | ||
const elapsedDays = Math.floor( | ||
(new Date().getTime() - new Date(Jan1).getTime()) / ONE_DAY_MS | ||
); | ||
expect(getElapsedDays(Jan1.toDateString())).toBe(elapsedDays); | ||
afterAll(() => { | ||
jest.useRealTimers(); | ||
}); | ||
|
||
it('returns elapsed minutes', () => { | ||
const elapsedMinutes = Math.floor( | ||
(new Date().getTime() - new Date(Jan1).getTime()) / ONE_MINUTE_MS | ||
); | ||
expect(getElapsedMinutes(new Date(Jan1))).toBe(elapsedMinutes); | ||
describe('getElapsedDays', () => { | ||
it('returns elapsed days', () => { | ||
const t = t0.minus({ days: 42 }); | ||
expect(getElapsedDays(t.toISO()!)).toBe(42); | ||
}); | ||
}); | ||
|
||
describe('getElapsedMinutes', () => { | ||
it('returns elapsed minutes', () => { | ||
const t = t0.minus({ minutes: 42 }); | ||
expect(getElapsedMinutes(t.toJSDate())).toBe(42); | ||
}); | ||
}); | ||
|
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describe('getElapsedHours', () => { | ||
it('returns elapsed hours', () => { | ||
const elapsedHours = Math.floor( | ||
(new Date().getTime() - new Date(Jan1).getTime()) / ONE_HOUR_MS | ||
); | ||
expect(getElapsedHours(Jan1.toISOString())).toBe(elapsedHours); // ISOstring | ||
expect(getElapsedHours(Jan1)).toBe(elapsedHours); // JS Date | ||
const t = t0.minus({ hours: 42 }); | ||
expect(getElapsedHours(t.toISO()!)).toBe(42); // ISOstring | ||
expect(getElapsedHours(t.toJSDate())).toBe(42); // JS Date | ||
}); | ||
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it('returns zero when date passed is invalid', () => { | ||
expect(getElapsedHours(new Date('invalid_date_string'))).toBe(0); | ||
}); | ||
}); | ||
|
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describe('getElapsedMilliseconds', () => { | ||
describe('getElapsedMs', () => { | ||
it('returns elapsed time in milliseconds', () => { | ||
const elapsedMs = new Date().getTime() - new Date(Jan1).getTime(); | ||
expect(getElapsedMs(Jan1.toISOString())).toBe(elapsedMs); | ||
const t = t0.minus({ milliseconds: 42 }); | ||
expect(getElapsedMs(t.toISO()!)).toBe(42); | ||
}); | ||
}); | ||
}); |