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// @flow
/* eslint-env mocha */
import assert from 'assert'
import differenceInHours from '.'
describe('differenceInHours', function() {
it('returns the number of hours between the given dates', function() {
const result = differenceInHours(
new Date(2014, 6 /* Jul */, 2, 20, 0),
new Date(2014, 6 /* Jul */, 2, 6, 0)
)
assert(result === 14)
})
it('returns a negative number if the time value of the first date is smaller', function() {
const result = differenceInHours(
new Date(2014, 6 /* Jul */, 2, 6, 0),
new Date(2014, 6 /* Jul */, 2, 20, 0)
)
assert(result === -14)
})
it('accepts timestamps', function() {
const result = differenceInHours(
new Date(2014, 8 /* Sep */, 5, 18, 0).getTime(),
new Date(2014, 8 /* Sep */, 5, 6, 0).getTime()
)
assert(result === 12)
})
describe('edge cases', function() {
it('the difference is less than an hour, but the given dates are in different calendar hours', function() {
const result = differenceInHours(
new Date(2014, 8 /* Sep */, 5, 12),
new Date(2014, 8 /* Sep */, 5, 11, 59)
)
assert(result === 0)
})
it('the same for the swapped dates', function() {
const result = differenceInHours(
new Date(2014, 8 /* Sep */, 5, 11, 59),
new Date(2014, 8 /* Sep */, 5, 12)
)
assert(result === 0)
})
it('the difference is an integral number of hours', function() {
const result = differenceInHours(
new Date(2014, 8 /* Sep */, 5, 13, 0),
new Date(2014, 8 /* Sep */, 5, 12, 0)
)
assert(result === 1)
})
it('the given dates are the same', function() {
const result = differenceInHours(
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 = differenceInHours(
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 = differenceInHours(
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 = differenceInHours(
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 = differenceInHours(new Date(NaN), new Date(NaN))
assert(isNaN(result))
})
it('throws TypeError exception if passed less than 2 arguments', function() {
//@ts-expect-error
assert.throws(differenceInHours.bind(null), TypeError)
//@ts-expect-error
assert.throws(differenceInHours.bind(null, 1), TypeError)
})
})
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