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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 differenceInBusinessDays from '.'
describe('differenceInBusinessDays', function() {
it('returns the number of business days between the given dates, excluding weekends', function() {
var result = differenceInBusinessDays(
new Date(2014, 6 /* Jul */, 20),
new Date(2014, 0 /* Jan */, 10)
)
assert(result === 135)
})
it('returns a negative number if the time value of the first date is smaller', function() {
var result = differenceInBusinessDays(
new Date(2014, 0 /* Jan */, 10),
new Date(2014, 6 /* Jul */, 20)
)
assert(result === -135)
})
it('accepts timestamps', function() {
var result = differenceInBusinessDays(
new Date(2014, 6, 20).getTime(),
new Date(2014, 0, 10).getTime()
)
assert(result === 135)
})
describe('edge cases', function() {
it('the difference is less than a day, but the given dates are in different calendar days', function() {
var result = differenceInBusinessDays(
new Date(2014, 8 /* Sep */, 5, 0, 0),
new Date(2014, 8 /* Sep */, 4, 23, 59)
)
assert(result === 1)
})
it('the same for the swapped dates', function() {
var result = differenceInBusinessDays(
new Date(2014, 8 /* Sep */, 4, 23, 59),
new Date(2014, 8 /* Sep */, 5, 0, 0)
)
assert(result === -1)
})
it('the time values of the given dates are the same', function() {
var result = differenceInBusinessDays(
new Date(2014, 8 /* Sep */, 5, 0, 0),
new Date(2014, 8 /* Sep */, 4, 0, 0)
)
assert(result === 1)
})
it('the given dates are the same', function() {
var result = differenceInBusinessDays(
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) {
return x === 0 && 1 / x < 0
}
var result = differenceInBusinessDays(
new Date(2014, 8 /* Sep */, 5, 0, 0),
new Date(2014, 8 /* Sep */, 5, 0, 0)
)
var resultIsNegative = isNegativeZero(result)
assert(resultIsNegative === false)
})
it('returns NaN if the first date is `Invalid Date`', function() {
var result = differenceInBusinessDays(
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 = differenceInBusinessDays(
new Date(2017, 0 /* Jan */, 1),
new Date(NaN)
)
assert(isNaN(result))
})
it('returns NaN if the both dates are `Invalid Date`', function() {
var result = differenceInBusinessDays(new Date(NaN), new Date(NaN))
assert(isNaN(result))
})
it('throws TypeError exception if passed less than 2 arguments', function() {
assert.throws(differenceInBusinessDays.bind(null), TypeError)
assert.throws(differenceInBusinessDays.bind(null, 1), TypeError)
})
})
})