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<!DOCTYPE html>
<!--
Copyright 2017 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<link rel="import" href="/tracing/base/view_state.html">
<script>
'use strict';
tr.b.unittest.testSuite(function() {
class Stuff extends tr.b.ViewState {
constructor() {
super();
this.define('boole', false);
this.define('sub', []);
}
}
tr.b.ViewState.register(Stuff);
test('sync', function() {
const state = new Stuff();
let updateCount = 0;
let delta;
function listener(event) {
++updateCount;
delta = event.delta;
}
state.addUpdateListener(listener);
assert.strictEqual(0, updateCount);
state.boole = true;
assert.strictEqual(1, updateCount);
assert.isFalse(delta.boole.previous);
assert.isTrue(delta.boole.current);
assert.isTrue(state.boole);
state.boole = true;
assert.strictEqual(1, updateCount);
state.sub = [new Stuff()];
assert.strictEqual(2, updateCount);
assert.lengthOf(delta.sub.previous, 0);
assert.lengthOf(delta.sub.current, 1);
state.sub.push(new Stuff());
assert.strictEqual(2, updateCount);
state.sub[0].addUpdateListener(listener);
assert.strictEqual(2, updateCount);
state.sub[0].boole = true;
assert.strictEqual(3, updateCount);
assert.isFalse(delta.boole.previous);
assert.isTrue(delta.boole.current);
assert.isTrue(state.sub[0].boole);
});
test('async', async function() {
const state = new Stuff();
let updateCount = 0;
let delta;
async function listener(event) {
++updateCount;
delta = event.delta;
await Promise.resolve();
}
state.addUpdateListener(listener);
assert.strictEqual(0, updateCount);
await state.update({boole: true});
assert.strictEqual(1, updateCount);
assert.isFalse(delta.boole.previous);
assert.isTrue(delta.boole.current);
assert.isTrue(state.boole);
await state.update({boole: true});
assert.strictEqual(1, updateCount);
await state.update({sub: [new Stuff()]});
assert.strictEqual(2, updateCount);
assert.lengthOf(delta.sub.previous, 0);
assert.lengthOf(delta.sub.current, 1);
state.sub.push(new Stuff());
assert.strictEqual(2, updateCount);
state.sub[0].addUpdateListener(listener);
assert.strictEqual(2, updateCount);
await state.sub[0].update({boole: true});
assert.strictEqual(3, updateCount);
assert.isFalse(delta.boole.previous);
assert.isTrue(delta.boole.current);
assert.isTrue(state.sub[0].boole);
});
});
</script>
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