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// @flow
/* eslint-env mocha */
import assert from 'power-assert'
import startOfDay from '.'
describe('startOfDay', function() {
it('returns the date with the time set to 00:00:00', function() {
const date = new Date(2014, 8 /* Sep */, 2, 11, 55, 0)
const result = startOfDay(date)
assert.deepEqual(result, new Date(2014, 8 /* Sep */, 2, 0, 0, 0, 0))
})
it('accepts a timestamp', function() {
const date = new Date(2014, 8 /* Sep */, 2, 11, 55, 0).getTime()
const result = startOfDay(date)
assert.deepEqual(result, new Date(2014, 8 /* Sep */, 2, 0, 0, 0, 0))
})
it('does not mutate the original date', function() {
const date = new Date(2014, 8 /* Sep */, 2, 11, 55, 0)
startOfDay(date)
assert.deepEqual(date, new Date(2014, 8 /* Sep */, 2, 11, 55, 0))
})
it('returns `Invalid Date` if the given date is invalid', function() {
const result = startOfDay(new Date(NaN))
//@ts-expect-error
assert(result instanceof Date && isNaN(result))
})
it('throws TypeError exception if passed less than 1 argument', function() {
assert.throws(startOfDay.bind(null), TypeError)
})
})
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