gerben
/
doctype-to-string

import test from 'ava'
import Window from 'window';

import doctypeToString from '../src'

function makeStubDocument(doctype) {
    const window = new Window()
    const parser = new window.DOMParser()
    const doc = parser.parseFromString(
        `${doctype}<html></html>`,
        'text/html'
    )
    return doc
}

test('should return empty string if doctype is null', t => {
    t.is(doctypeToString(null), '')
})

test('should throw if argument is not a DocumentType', t => {
    t.throws(() => doctypeToString('a string, for example.'), TypeError)
})

test('should work for a HTML5-ish doctype', t => {
    const doctype = '<!DOCTYPE html>'
    const doc = makeStubDocument(doctype)
    t.is(doctypeToString(doc.doctype), doctype)
})

test('should work for a HTML4-ish doctype', t => {
    const doctype = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">'
    const doc = makeStubDocument(doctype)
    t.is(doctypeToString(doc.doctype), doctype)
})

test('should work for a doctype without public id', t => {
    const doctype = '<!DOCTYPE html SYSTEM "http://www.w3.org/TR/html4/loose.dtd">'
    const doc = makeStubDocument(doctype)
    t.is(doctypeToString(doc.doctype), doctype)
})