【发布时间】：2015-01-09 18:25:36
【问题描述】：
我正在尝试为我们的测试框架连接 Mocha/Chai/Karma。我几乎到了那里，使用 Polymer 单元测试指南作为基础。我想要一些更简单的东西，只需要一个tests.js 脚本并使用一个凉亭组件vca-tests。这就是 `tests.js 的样子：
(function() {
'user strict';
elementSuite('vca-colour-picker', function() {
test('setting the web value should be reflected in the RGB values', function(done) {
this.set(function(element) {
element.web = '#FFCC88';
}).then(function(element) {
assert.equal(element.r, 255);
assert.equal(element.g, 204);
assert.equal(element.b, 136);
});
});
});
}());
所以我写了一个 Mocha 测试运行器：
<!doctype html>
<html>
<head>
<title>VCA Element Test Runner</title>
<meta charset="UTF-8">
<!-- Load in the frameworks we need -->
<script src="../platform/platform.js"></script>
<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="vca-tests.html">
</head>
<body>
<div id="mocha"></div>
</body>
</html>
elementSuite 函数将组件从存储库的路由加载到<iframe>。由于bower 的工作方式，我需要修改导入的位置。从bower_components 文件夹中加载的vca-test.html：
<!-- Test frameworks -->
<link rel="stylesheet" href="../mocha/mocha.css" />
<script src="../mocha/mocha.js"></script>
<script src="../chai/chai.js"></script>
<!-- Perform some set up -->
<script>
(function() {
'use strict';
var iframe,
documents = {};
function elementImport(suite, name, done) {
if (this.status === 200) {
var i,
doc = iframe.contentDocument,
link = doc.createElement('link'),
win = iframe.contentWindow,
head = doc.getElementsByTagName('head')[0],
body = doc.body,
origin = window.location.origin,
links = this.response.querySelectorAll('link[rel="import"]'),
element = this.response.querySelector('polymer-element');
// Fix up the import paths as they will be referencing the root path and we
// need the relative to the bower components (which is where we are now)
for (i = 0; i < links.length; ++i) {
links[i].href = links[i].href.replace(origin, '..');
doc.adoptNode(links[i]);
head.appendChild(links[i]);
}
// Make sure polymer is fired up
doc.addEventListener('polymer-ready', function() {
// --------------------------------------------------------------------------
// At this point we have loaded all of the dependent components of the
// component to test but we still need to be able to create instances
// of the component. The below code will work, but because it is loaded
// to the root of the repository all the dependencies will fail with 404s
/*/ Import the rest of the component
link.rel = 'import';
link.href = '../../' + name + '.html';
link.import = this.response;
head.appendChild(link);/**/
// --------------------------------------------------------------------------
// Create the element
suite.ctx.element = doc.createElement(name);
body.appendChild(suite.ctx.element);
// Tell mocha that we are done
done();
}, false);
}
}
function elementLoad(name, done) {
var xhr = new XMLHttpRequest(),
path = '../../' + name + '.html';
xhr.open('GET', path, true);
xhr.responseType = 'document';
xhr.onload = elementImport.bind(xhr, this, name, done);
xhr.send();
}
function elementSetup(name, done) {
iframe = document.createElement('iframe');
iframe.style.cssText = /*'position: absolute;left:-10000em;*/'width:768px;height:1024px';
iframe.onload = elementLoad.bind(this, name, done);
iframe.src = 'iframe.html';
document.body.appendChild(iframe);
// Provide convience functions
this.ctx.set = function(callback) {
callback.call(this, this.element);
Platform.flush();
return this;
};
this.ctx.then = function(callback) {
setTimeout(function() {
callback.call(this, this.element);
this.test.callback();
}.bind(this), 50);
return this;
};
}
function elementTeardown() {
// document.body.removeChild(iframe);
}
// This is what the tests.js script uses to register an element to test
window.elementSuite = function(name, tests) {
suite(name, function() {
setup(elementSetup.bind(this, name));
teardown(elementTeardown);
tests();
});
}
// We use chai as our assertion framework
window.assert = chai.assert;
// Mocha runs our tests
mocha.setup({ui: 'tdd', slow: 1000, timeout: 5000});
}());
</script>
<!-- Load in the test script -->
<script src="../../tests.js"></script>
<!-- Run the tests -->
<script>
mocha.run();
</script>
所以我的问题归结为：我如何 XHR 包含 polymer-element 的 HTML 文档但更改基础 href 以便加载我的相关凉亭组件？
当<link rel="import"> 被加载以使元素可用时，Polymer 似乎发挥了一些作用。
【问题讨论】：
-
查看 Polymer 代码的内部结构，使用
data:URI 作为href是受支持的，但 Polymer HTMLImports polyfill 似乎不支持它。查看补丁。
标签： javascript unit-testing polymer