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// @flow
/* eslint-env mocha */
import assert from 'assert'
import compareDesc from '.'
describe('compareDesc', function() {
it('returns 0 if the given dates are equal', function() {
const result = compareDesc(
new Date(1989, 6 /* Jul */, 10),
new Date(1989, 6 /* Jul */, 10)
)
assert(result === 0)
})
it('returns 1 if the first date is before the second one', function() {
const result = compareDesc(
new Date(1987, 1 /* Feb */, 11),
new Date(1989, 6 /* Jul */, 10)
)
assert(result === 1)
})
it('returns -1 if the first date is after the second one', function() {
const result = compareDesc(
new Date(1989, 6 /* Jul */, 10),
new Date(1987, 1 /* Feb */, 11)
)
assert(result === -1)
})
it('sorts the dates array in the reverse chronological order when function is passed as the argument to Array.prototype.sort()', function() {
const unsortedArray = [
new Date(1995, 6 /* Jul */, 2),
new Date(1987, 1 /* Feb */, 11),
new Date(1989, 6 /* Jul */, 10)
]
const sortedArray = [
new Date(1995, 6 /* Jul */, 2),
new Date(1989, 6 /* Jul */, 10),
new Date(1987, 1 /* Feb */, 11)
]
unsortedArray.sort(compareDesc)
const result = unsortedArray
assert.deepStrictEqual(result, sortedArray)
})
it('accepts timestamps', function() {
const result = compareDesc(
new Date(1987, 1 /* Feb */, 11).getTime(),
new Date(1989, 6 /* Jul */, 10).getTime()
)
assert(result === 1)
})
it('returns NaN if the first date is `Invalid Date`', function() {
const result = compareDesc(new Date(NaN), new Date(1989, 6 /* Jul */, 10))
assert(isNaN(result))
})
it('returns NaN if the second date is `Invalid Date`', function() {
const result = compareDesc(new Date(1989, 6 /* Jul */, 10), new Date(NaN))
assert(isNaN(result))
})
it('returns NaN if the both dates are `Invalid Date`', function() {
const result = compareDesc(new Date(1989, 6 /* Jul */, 10), new Date(NaN))
assert(isNaN(result))
})
it('throws TypeError exception if passed less than 2 arguments', function() {
//@ts-expect-error
assert.throws(compareDesc.bind(null), TypeError)
//@ts-expect-error
assert.throws(compareDesc.bind(null, 1), TypeError)
})
})
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