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// @flow
/* eslint-env mocha */
import assert from 'power-assert'
import getISOWeek from '.'
describe('getISOWeek', function() {
it('returns the ISO week of the given date', function() {
const result = getISOWeek(new Date(2005, 0 /* Jan */, 2))
assert(result === 53)
})
it('accepts a timestamp', function() {
const result = getISOWeek(new Date(2008, 11 /* Dec */, 29).getTime())
assert(result === 1)
})
describe('edge cases', function() {
it('returns the ISO week at 1 January 2016', function() {
const result = getISOWeek(new Date(2016, 0 /* Jan */, 1))
assert(result === 53)
})
it('returns the ISO week at 1 May 2016', function() {
const result = getISOWeek(new Date(2016, 4 /* May */, 1))
assert(result === 17)
})
it('returns the ISO week at 2 May 2016', function() {
const result = getISOWeek(new Date(2016, 4 /* May */, 2))
assert(result === 18)
})
it('returns the ISO week at 31 May 2016', function() {
const result = getISOWeek(new Date(2016, 4 /* May */, 31))
assert(result === 22)
})
})
it('handles dates before 100 AD', function() {
const initialDate = new Date(0)
initialDate.setFullYear(7, 11 /* Dec */, 30)
initialDate.setHours(0, 0, 0, 0)
const result = getISOWeek(initialDate)
assert(result === 52)
})
it('returns NaN if the given date is invalid', function() {
const result = getISOWeek(new Date(NaN))
assert(isNaN(result))
})
it('throws TypeError exception if passed less than 1 argument', function() {
assert.throws(getISOWeek.bind(null), TypeError)
})
})
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