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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 differenceInISOYears from '.'
describe('differenceInISOYears', function () {
it('returns the number of full ISO week-numbering years between the given dates', function () {
var result = differenceInISOYears(
new Date(2011, 6 /* Jul */, 2, 6, 0),
new Date(2012, 6 /* Jul */, 2, 18, 0)
)
assert(result === 1)
})
it('returns a negative number if the time value of the second date is smaller', function () {
var result = differenceInISOYears(
new Date(2012, 6 /* Jul */, 2, 18, 0),
new Date(2011, 6 /* Jul */, 2, 6, 0)
)
assert(result === -1)
})
it('accepts strings', function () {
var result = differenceInISOYears(
new Date(2000, 0 /* Jan */, 1).toISOString(),
new Date(2014, 0 /* Jan */, 1).toISOString()
)
assert(result === 14)
})
it('accepts timestamps', function () {
var result = differenceInISOYears(
new Date(2010, 6 /* Jul */, 2).getTime(),
new Date(2014, 6 /* Jul */, 2).getTime()
)
assert(result === 4)
})
it('handles dates before 100 AD', function () {
var firstDate = new Date(0)
firstDate.setFullYear(0, 0 /* Jan */, 1)
firstDate.setHours(0, 0, 0, 0)
var secondDate = new Date(0)
secondDate.setFullYear(14, 0 /* Jan */, 1)
secondDate.setHours(0, 0, 0, 0)
var result = differenceInISOYears(firstDate, secondDate)
assert(result === 14)
})
describe('edge cases', function () {
it('the difference is less than an ISO year, but the given dates are in different calendar years', function () {
var result = differenceInISOYears(
new Date(2012, 0 /* Jan */, 1),
new Date(2012, 0 /* Jan */, 2)
)
assert(result === 0)
})
it('the same for the swapped dates', function () {
var result = differenceInISOYears(
new Date(2012, 0 /* Jan */, 2),
new Date(2012, 0 /* Jan */, 1)
)
assert(result === 0)
})
it('the ISO weeks and weekdays of the given dates are the same', function () {
var result = differenceInISOYears(
new Date(2012, 0 /* Jan */, 2),
new Date(2013, 11 /* Dec */, 30)
)
assert(result === 2)
})
it('the given dates are the same', function () {
var result = differenceInISOYears(
new Date(2014, 8 /* Sep */, 5, 0, 0),
new Date(2014, 8 /* Sep */, 5, 0, 0)
)
assert(result === 0)
})
})
it('returns NaN if the first date is `Invalid Date`', function () {
var result = differenceInISOYears(
new Date(NaN),
new Date(2017, 0 /* Jan */, 1)
)
assert(isNaN(result))
})
it('returns NaN if the second date is `Invalid Date`', function () {
var result = differenceInISOYears(
new Date(2017, 0 /* Jan */, 1),
new Date(NaN)
)
assert(isNaN(result))
})
})