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/* eslint-env mocha */
import assert from 'power-assert'
import differenceInCalendarMonths from '.'
describe('differenceInCalendarMonths', function () {
it('returns the number of calendar months between the given dates', function () {
const result = differenceInCalendarMonths(
new Date(2012, 6 /* Jul */, 2, 18, 0),
new Date(2011, 6 /* Jul */, 2, 6, 0)
)
assert(result === 12)
})
it('returns a negative number if the time value of the first date is smaller', function () {
const result = differenceInCalendarMonths(
new Date(2011, 6 /* Jul */, 2, 6, 0),
new Date(2012, 6 /* Jul */, 2, 18, 0)
)
assert(result === -12)
})
it('accepts timestamps', function () {
const result = differenceInCalendarMonths(
new Date(2014, 7 /* Aug */, 2).getTime(),
new Date(2010, 6 /* Jul */, 2).getTime()
)
assert(result === 49)
})
describe('edge cases', function () {
it('the difference is less than a month, but the given dates are in different calendar months', function () {
const result = differenceInCalendarMonths(
new Date(2014, 8 /* Sep */, 1),
new Date(2014, 7 /* Aug */, 31)
)
assert(result === 1)
})
it('the same for the swapped dates', function () {
const result = differenceInCalendarMonths(
new Date(2014, 7 /* Aug */, 31),
new Date(2014, 8 /* Sep */, 1)
)
assert(result === -1)
})
it('the days of months of the given dates are the same', function () {
const result = differenceInCalendarMonths(
new Date(2014, 8 /* Sep */, 6),
new Date(2014, 7 /* Aug */, 6)
)
assert(result === 1)
})
it('the given dates are the same', function () {
const result = differenceInCalendarMonths(
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 = differenceInCalendarMonths(
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 = differenceInCalendarMonths(
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 = differenceInCalendarMonths(
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 = differenceInCalendarMonths(new Date(NaN), new Date(NaN))
assert(isNaN(result))
})
it('throws TypeError exception if passed less than 2 arguments', function () {
assert.throws(differenceInCalendarMonths.bind(null), TypeError)
assert.throws(differenceInCalendarMonths.bind(null, 1), TypeError)
})
})
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