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// @flow
/* eslint-env mocha */
import assert from 'power-assert'
import sub from '.'
describe('sub', () => {
it('subtracts the duration from the given date', () => {
const result = sub(new Date(2017, 5 /* June */, 15, 15, 29, 20), {
years: 2,
months: 9,
weeks: 1,
days: 7,
hours: 5,
minutes: 9,
seconds: 30
})
assert.deepEqual(result, new Date(2014, 8 /* Sep */, 1, 10, 19, 50))
})
it('returns same date object when passed empty duration', () => {
const result = sub(new Date(2014, 8 /* Sep */, 1, 10).getTime(), {})
assert.deepEqual(result, new Date(2014, 8 /* Sep */, 1, 10))
})
it('accepts a timestamp', () => {
const result = sub(new Date(2014, 8 /* Sep */, 1, 14).getTime(), {
hours: 4
})
assert.deepEqual(result, new Date(2014, 8 /* Sep */, 1, 10))
})
it('converts a fractional number to an integer', () => {
const result = sub(new Date(2014, 8 /* Sep */, 1, 14), { hours: 4.2 })
assert.deepEqual(result, new Date(2014, 8 /* Sep */, 1, 10))
})
it('implicitly converts number arguments', () => {
// $ExpectedMistake
const result = sub(new Date(2014, 8 /* Sep */, 1, 14), { hours: '4.2' })
assert.deepEqual(result, new Date(2014, 8 /* Sep */, 1, 10))
})
it('does not mutate the original date', () => {
const date = new Date(2014, 8 /* Sep */, 1, 10)
sub(date, { hours: 4 })
assert.deepEqual(date, new Date(2014, 8 /* Sep */, 1, 10))
})
it('works well if the desired month has fewer days and the provided date is in the last day of a month', () => {
const date = new Date(2014, 11 /* Dec */, 31)
const result = sub(date, { months: 3 })
assert.deepEqual(result, new Date(2014, 8 /* Sep */, 30))
})
it('handles dates before 100 AD', () => {
const initialDate = new Date(0)
initialDate.setFullYear(1, 2 /* Mar */, 31)
initialDate.setHours(0, 0, 0, 0)
const expectedResult = new Date(0)
expectedResult.setFullYear(1, 1 /* Feb */, 28)
expectedResult.setHours(0, 0, 0, 0)
const result = sub(initialDate, { months: 1 })
assert.deepEqual(result, expectedResult)
})
it('returns `Invalid Date` if the given date is invalid', () => {
const result = sub(new Date(NaN), { hours: 5 })
assert(result instanceof Date && isNaN(result))
})
it('throws RangeError exception if passed Number as duration', () => {
// $ExpectedMistake
const result = sub(new Date(2014, 8, 1), 'wut')
assert(result instanceof Date && isNaN(result))
})
it('throws TypeError exception if passed less than 2 arguments', () => {
assert.throws(sub.bind(null), TypeError)
assert.throws(sub.bind(null, 1), TypeError)
})
})
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