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test.ts
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test.ts
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/* eslint-env mocha */
import assert from 'assert'
import previousSaturday from '.'
describe('previousSaturday', function () {
it('returns the previous Saturday given various dates after the same', function () {
assert.deepStrictEqual(
previousSaturday(new Date(2021, 5 /* Jun */, 7)),
new Date(2021, 5 /* Jun */, 5)
)
assert.deepStrictEqual(
previousSaturday(new Date(2021, 5 /* Jun */, 8)),
new Date(2021, 5 /* Jun */, 5)
)
assert.deepStrictEqual(
previousSaturday(new Date(2021, 5 /* Jun */, 12)),
new Date(2021, 5 /* Jun */, 5)
)
assert.deepStrictEqual(
previousSaturday(new Date(2021, 5 /* Jun */, 16)),
new Date(2021, 5 /* Jun */, 12)
)
assert.deepStrictEqual(
previousSaturday(new Date(2021, 5 /* Jun */, 17)),
new Date(2021, 5 /* Jun */, 12)
)
assert.deepStrictEqual(
previousSaturday(new Date(2021, 5 /* Jun */, 24)),
new Date(2021, 5 /* Jun */, 19)
)
})
it('returns `Invalid Date` if the given date is invalid', function () {
assert(previousSaturday(new Date(NaN)) instanceof Date)
})
})