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// @flow
/* eslint-env mocha */
import assert from 'power-assert'
import subDays from '.'
describe('subDays', function() {
it('subtracts the given number of days', function() {
const result = subDays(new Date(2014, 8 /* Sep */, 1), 10)
assert.deepEqual(result, new Date(2014, 7 /* Aug */, 22))
})
it('accepts a timestamp', function() {
const result = subDays(new Date(2014, 8 /* Sep */, 1).getTime(), 10)
assert.deepEqual(result, new Date(2014, 7 /* Aug */, 22))
})
it('converts a fractional number to an integer', function() {
const result = subDays(new Date(2014, 8 /* Sep */, 1), 10.85)
assert.deepEqual(result, new Date(2014, 7 /* Aug */, 22))
})
it('implicitly converts number arguments', function() {
// $ExpectedMistake
// @ts-expect-error
const result = subDays(new Date(2014, 8 /* Sep */, 1), '10')
assert.deepEqual(result, new Date(2014, 7 /* Aug */, 22))
})
it('does not mutate the original date', function() {
const date = new Date(2014, 8 /* Sep */, 1)
subDays(date, 11)
assert.deepEqual(date, new Date(2014, 8 /* Sep */, 1))
})
it('returns `Invalid Date` if the given date is invalid', function() {
const result = subDays(new Date(NaN), 10)
// @ts-expect-error
assert(result instanceof Date && isNaN(result))
})
it('returns `Invalid Date` if the given amount is NaN', function() {
const result = subDays(new Date(2014, 8 /* Sep */, 1), NaN)
// @ts-expect-error
assert(result instanceof Date && isNaN(result))
})
it('throws TypeError exception if passed less than 2 arguments', function() {
assert.throws(subDays.bind(null), TypeError)
assert.throws(subDays.bind(null, 1), TypeError)
})
})
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