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test.js
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test.js
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// @flow
/* eslint-env mocha */
import assert from 'power-assert'
import addMonths from '.'
describe('addMonths', function () {
it('adds the given number of months', function () {
var result = addMonths(new Date(2014, 8 /* Sep */, 1), 5)
assert.deepEqual(result, new Date(2015, 1 /* Feb */, 1))
})
it('accepts a string', function () {
var result = addMonths(new Date(2014, 8 /* Sep */, 1).toISOString(), 12)
assert.deepEqual(result, new Date(2015, 8 /* Sep */, 1))
})
it('accepts a timestamp', function () {
var result = addMonths(new Date(2014, 8 /* Sep */, 1).getTime(), 12)
assert.deepEqual(result, new Date(2015, 8 /* Sep */, 1))
})
it('implicitly converts number arguments', function () {
// $ExpectedMistake
var result = addMonths(new Date(2014, 8 /* Sep */, 1), '5')
assert.deepEqual(result, new Date(2015, 1 /* Feb */, 1))
})
it('does not mutate the original date', function () {
var date = new Date(2014, 8 /* Sep */, 1)
addMonths(date, 12)
assert.deepEqual(date, new Date(2014, 8 /* Sep */, 1))
})
it('works well if the desired month has fewer days and the provided date is in the last day of a month', function () {
var date = new Date(2014, 11 /* Dec */, 31)
var result = addMonths(date, 2)
assert.deepEqual(result, new Date(2015, 1 /* Feb */, 28))
})
it('handles dates before 100 AD', function () {
var initialDate = new Date(0)
initialDate.setFullYear(0, 0 /* Jan */, 31)
initialDate.setHours(0, 0, 0, 0)
var expectedResult = new Date(0)
expectedResult.setFullYear(0, 1 /* Feb */, 29)
expectedResult.setHours(0, 0, 0, 0)
var result = addMonths(initialDate, 1)
assert.deepEqual(result, expectedResult)
})
it('returns `Invalid Date` if the given date is invalid', function () {
var result = addMonths(new Date(NaN), 5)
assert(result instanceof Date && isNaN(result))
})
it('returns `Invalid Date` if the given amount is NaN', function () {
var result = addMonths(new Date(2014, 8 /* Sep */, 1), NaN)
assert(result instanceof Date && isNaN(result))
})
})