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test.js
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test.js
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/*
* Copyright 2017 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
import './dist/polyfill.js';
suite('scoped', function() {
function element(name, textContent) {
var el = document.createElement(name);
el.textContent = textContent || '';
return el;
}
function scoped(css) {
var s = element('style', css);
s.scoped = true;
return s;
}
/**
* Since our logic runs inside MutationObserver, we need a microtask to observe most things.
*/
function task(fn, done) {
Promise.resolve(true).then(() => {
fn();
done && done();
}).catch((err) => done(err));
}
var holder;
setup(function() {
holder = document.createElement('div');
document.body.appendChild(holder);
});
teardown(function() {
holder.textContent = '';
document.body.removeChild(holder);
holder = null;
});
suite('rewrite', function() {
const rewrite = (description, source, expected) => {
test(description, function(done) {
var s = scoped(source + ' {}');
holder.appendChild(s);
task(() => {
const rules = Array.from(s.sheet.rules);
const actual = rules.map((rule) => rule.selectorText).join('\n');
assert.equal(actual, expected);
}, done);
});
};
// TODO: These tests rely on order, as the polyfill uses an incrementing counting for prefixes.
rewrite('rewrite test', 'h1', '[__scoped_1] h1');
rewrite('many selectors', 'h1, h2', '[__scoped_2] h1, [__scoped_2] h2');
rewrite(':scope rewrite', '.foo, h1:scope, h2:scope:not(.bar)', '[__scoped_3] .foo, h1[__scoped_3], h2[__scoped_3]:not(.bar)');
rewrite('unsupported inner :scope', '.foo:-webkit-any(h1:scope, h4, h3:scope):not([foo])', ':not(*)');
rewrite('tricky without :scope', '.foo:-webkit-any(h1, h4, h3):not([foo])', '[__scoped_5] .foo:-webkit-any(h1,h4,h3):not([foo])');
rewrite('duplicate :scope rewrite', 'h2:scope:scope', 'h2[__scoped_6][__scoped_6]');
});
suite('apply', function() {
test(':scope', function(done) {
var s = scoped(':scope { background: red; }');
holder.appendChild(s);
task(() => {
var computed = window.getComputedStyle(holder);
assert.equal(computed.backgroundColor, 'rgb(255, 0, 0)', 'scope is changed');
computed = window.getComputedStyle(document.documentElement);
assert.notEqual(computed.backgroundColor, 'rgb(255, 0, 0)', ':root remains unchanged');
}, done);
});
test('invalid :scope', function(done) {
var s = scoped('div :scope { background: red; }');
holder.appendChild(s);
task(() => {
var computed = window.getComputedStyle(document.documentElement);
assert.notEqual(computed.backgroundColor, 'rgb(255, 0, 0)', ':root remains unchanged');
}, done);
});
test('microtask run', function(done) {
var s = scoped('h1 { color: red; }');
var h1 = element('h1', 'first');
holder.appendChild(h1);
var computed = window.getComputedStyle(h1);
assert.notEqual(computed.color, 'rgb(255, 0, 0)', 'style should be normal before insertion');
task(() => {
holder.appendChild(s);
assert.equal(computed.color, 'rgb(255, 0, 0)', 'changed after insertion');
}, done);
});
test('doesn\'t effect others', function(done) {
var branch = element('div');
holder.appendChild(branch);
var unchanged = element('h1', 'unchanged');
holder.appendChild(unchanged);
var targeted = element('h1', 'targeted');
branch.appendChild(targeted);
// only elements in the scoped branch should change
branch.appendChild(scoped('h2, h1 { color: red; }'));
task(() => {
var computed = window.getComputedStyle(unchanged);
assert.notEqual(computed.color, 'rgb(255, 0, 0)', 'untargeted element should not be modified');
var computed = window.getComputedStyle(targeted);
assert.equal(computed.color, 'rgb(255, 0, 0)');
}, done);
});
test('import', async function() {
const u = new URL(window.location);
if (u.hostname === '127.0.0.1') {
u.hostname = 'localhost';
} else {
u.hostname = '127.0.0.1';
}
holder.append(scoped(`
@import url("${u.origin}/demo/one.css");
@import url("${u.origin}/demo/two.css");
`));
// TODO(samthor): This is gross, but we need to allow the fetch to happen.
await new Promise((r) => window.setTimeout(r, 100));
const elOne = Object.assign(document.createElement('div'), {className: 'one'});
const elTwo = Object.assign(document.createElement('div'), {className: 'two'});
holder.append(elOne, elTwo);
const computedOne = window.getComputedStyle(elOne);
assert.equal(computedOne.color, 'rgb(255, 0, 0)');
const computedTwo = window.getComputedStyle(elTwo);
assert.equal(computedTwo.color, 'rgb(0, 0, 255)');
try {
document.body.append(elOne);
const computedOne = window.getComputedStyle(elOne);
assert.equal(computedOne.color, 'rgb(0, 0, 0)');
} finally {
elOne.remove();
}
});
});
});