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// @flow
/* eslint-env mocha */
/* global HTMLIFrameElement */
import assert from 'assert'
import { assertType } from '../_lib/test'
import isDate from '.'
describe('isDate', () => {
it('returns true if the given value is a date object', () => {
assert(isDate(new Date()))
})
it('returns true if the given value is an Invalid Date', () => {
assert(isDate(new Date(NaN)))
})
it('ensures that the passed argument is an instance of Date', () => {
const date: unknown = new Date()
if (isDate(date)) {
assertType<Date>(date)
} else {
assertType<unknown>(date)
}
})
describe('with date passed from another iframe', () => {
afterEach(() => {
const iframe = document.getElementById('iframe')
iframe && iframe.remove()
})
// Emulate web browser
if (!process.env.JEST_WORKER_ID) {
it('returns true for a date passed from another iframe', (done) => {
const iframe = document.createElement('iframe')
iframe.id = 'iframe'
iframe.addEventListener('load', () => {
execScript('window.date = new Date()') // eslint-disable-line no-implied-eval
// @ts-expect-error
assert(isDate(iframe.contentWindow.date))
// $ExpectedMistake sadly, but Flow doesn't know about Mocha's done
done()
})
if (!document.body) throw new Error('document.body is not defined')
document.body.appendChild(iframe)
})
}
function execScript(scriptText: string) {
const iframe = document.querySelector('iframe#iframe')
if (!iframe || !(iframe instanceof HTMLIFrameElement)) {
throw new Error("Can't execute the script because iframe isn't found")
}
const doc = iframe.contentDocument!
const script = doc.createElement('script')
script.innerText = scriptText
// @ts-expect-error
if (!(doc.body instanceof iframe.contentWindow.HTMLBodyElement)) {
throw new Error(
"Can't execute the script because iframe does not have body"
)
}
doc.body.append(script)
}
})
it('returns false if the given value is not a date object', () => {
assert(!isDate(new Date().getTime()))
assert(!isDate(new Date().toISOString()))
assert(!isDate({}))
assert(!isDate(null))
assert(!isDate(0))
})
it('throws TypeError exception if passed less than 1 argument', () => {
// @ts-expect-error
assert.throws(isDate.bind(null), TypeError)
})
})
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