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// @flow
/* eslint-env mocha */
import assert from 'assert'
import addISOWeekYears from '.'
describe('addISOWeekYears', function() {
it('adds the given number of ISO week-numbering years', function() {
const result = addISOWeekYears(new Date(2010, 6 /* Jul */, 2), 5)
assert.deepStrictEqual(result, new Date(2015, 5 /* Jun */, 26))
})
it('accepts a timestamp', function() {
const result = addISOWeekYears(new Date(2014, 8 /* Sep */, 1).getTime(), 12)
assert.deepStrictEqual(result, new Date(2026, 7 /* Aug */, 31))
})
it('converts a fractional number to an integer', function() {
const result = addISOWeekYears(new Date(2010, 6 /* Jul */, 2), 5.6)
assert.deepStrictEqual(result, new Date(2015, 5 /* Jun */, 26))
})
it('implicitly converts number arguments', function() {
// @ts-expect-error
const result = addISOWeekYears(new Date(2010, 6 /* Jul */, 2), '5')
assert.deepStrictEqual(result, new Date(2015, 5 /* Jun */, 26))
})
it('does not mutate the original date', function() {
const date = new Date(2014, 8 /* Sep */, 1)
addISOWeekYears(date, 12)
assert.deepStrictEqual(date, new Date(2014, 8 /* Sep */, 1))
})
it('handles dates before 100 AD', function() {
const initialDate = new Date(0)
initialDate.setFullYear(10, 6 /* Jul */, 2)
initialDate.setHours(0, 0, 0, 0)
const expectedResult = new Date(0)
expectedResult.setFullYear(15, 5 /* Jun */, 26)
expectedResult.setHours(0, 0, 0, 0)
const result = addISOWeekYears(initialDate, 5)
assert.deepStrictEqual(result, expectedResult)
})
it('returns `Invalid Date` if the given date is invalid', function() {
const result = addISOWeekYears(new Date(NaN), 5)
// @ts-expect-error
assert(result instanceof Date && isNaN(result))
})
it('returns `Invalid Date` if the given amount is NaN', function() {
const result = addISOWeekYears(new Date(2010, 6 /* Jul */, 2), NaN)
// @ts-expect-error
assert(result instanceof Date && isNaN(result))
})
it('throws TypeError exception if passed less than 2 arguments', function() {
// @ts-expect-error
assert.throws(addISOWeekYears.bind(null), TypeError)
// @ts-expect-error
assert.throws(addISOWeekYears.bind(null, 1), TypeError)
})
})
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