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// @flow
/* eslint-env mocha */
import assert from 'power-assert'
import differenceInCalendarWeeks from '.'
describe('differenceInCalendarWeeks', function () {
it('returns the number of calendar weeks between the given dates', function () {
const result = differenceInCalendarWeeks(
new Date(2014, 6 /* Jul */, 8, 18, 0),
new Date(2014, 5 /* Jun */, 29, 6, 0)
)
assert(result === 1)
})
it('allows to specify which day is the first day of the week', function () {
const result = differenceInCalendarWeeks(
new Date(2014, 6 /* Jul */, 8, 18, 0),
new Date(2014, 5 /* Jun */, 29, 6, 0),
{ weekStartsOn: 1 }
)
assert(result === 2)
})
it('allows to specify which day is the first day of the week in locale', function () {
const result = differenceInCalendarWeeks(
new Date(2014, 6 /* Jul */, 8, 18, 0),
new Date(2014, 5 /* Jun */, 29, 6, 0),
{
// @ts-expect-error
locale: {
options: { weekStartsOn: 1 },
},
}
)
assert(result === 2)
})
it('`options.weekStartsOn` overwrites the first day of the week specified in locale', function () {
const result = differenceInCalendarWeeks(
new Date(2014, 6 /* Jul */, 8, 18, 0),
new Date(2014, 5 /* Jun */, 29, 6, 0),
{
weekStartsOn: 1,
// @ts-expect-error
locale: {
options: { weekStartsOn: 0 },
},
}
)
assert(result === 2)
})
it('returns a positive number if the time value of the second date is smaller', function () {
const result = differenceInCalendarWeeks(
new Date(2014, 6 /* Jul */, 8, 18, 0),
new Date(2014, 5 /* Jun */, 29, 6, 0),
// @ts-expect-error
{ weekStartsOn: '1' }
)
assert(result === 2)
})
it('returns a negative number if the time value of the first date is smaller', function () {
const result = differenceInCalendarWeeks(
new Date(2014, 5 /* Jun */, 29, 6, 0),
new Date(2014, 6 /* Jul */, 8, 18, 0)
)
assert(result === -1)
})
it('accepts timestamps', function () {
const result = differenceInCalendarWeeks(
new Date(2014, 6 /* Jul */, 12).getTime(),
new Date(2014, 6 /* Jul */, 2).getTime()
)
assert(result === 1)
})
describe('edge cases', function () {
it('the difference is less than a week, but the given dates are in different calendar weeks', function () {
const result = differenceInCalendarWeeks(
new Date(2014, 6 /* Jul */, 6),
new Date(2014, 6 /* Jul */, 5)
)
assert(result === 1)
})
it('the same for the swapped dates', function () {
const result = differenceInCalendarWeeks(
new Date(2014, 6 /* Jul */, 5),
new Date(2014, 6 /* Jul */, 6)
)
assert(result === -1)
})
it('the days of weeks of the given dates are the same', function () {
const result = differenceInCalendarWeeks(
new Date(2014, 6 /* Jul */, 9),
new Date(2014, 6 /* Jul */, 2)
)
assert(result === 1)
})
it('the given dates are the same', function () {
const result = differenceInCalendarWeeks(
new Date(2014, 8 /* Sep */, 5, 0, 0),
new Date(2014, 8 /* Sep */, 5, 0, 0)
)
assert(result === 0)
})
it('does not return -0 when the given dates are the same', () => {
function isNegativeZero(x: number): boolean {
return x === 0 && 1 / x < 0
}
const result = differenceInCalendarWeeks(
new Date(2014, 8 /* Sep */, 5, 0, 0),
new Date(2014, 8 /* Sep */, 5, 0, 0)
)
const resultIsNegative = isNegativeZero(result)
assert(resultIsNegative === false)
})
})
it('returns NaN if the first date is `Invalid Date`', function () {
const result = differenceInCalendarWeeks(
new Date(NaN),
new Date(2017, 0 /* Jan */, 1)
)
assert(isNaN(result))
})
it('returns NaN if the second date is `Invalid Date`', function () {
const result = differenceInCalendarWeeks(
new Date(2017, 0 /* Jan */, 1),
new Date(NaN)
)
assert(isNaN(result))
})
it('returns NaN if the both dates are `Invalid Date`', function () {
const result = differenceInCalendarWeeks(new Date(NaN), new Date(NaN))
assert(isNaN(result))
})
it('throws `RangeError` if `options.weekStartsOn` is not convertable to 0, 1, ..., 6 or undefined', function () {
// @ts-expect-error
const block = differenceInCalendarWeeks.bind(
null,
new Date(2014, 6 /* Jul */, 8, 18, 0),
new Date(2014, 5 /* Jun */, 29, 6, 0),
{ weekStartsOn: NaN }
)
assert.throws(block, RangeError)
})
it('throws TypeError exception if passed less than 2 arguments', function () {
assert.throws(differenceInCalendarWeeks.bind(null), TypeError)
assert.throws(differenceInCalendarWeeks.bind(null, 1), TypeError)
})
})
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