如何在 Polymer 中测试服务？

Question

我正在编写一个聚合物应用程序并有一个由聚合物元素使用的服务。我想测试这项服务，但不知道如何做。

这是我在服务中的内容：

<script src="../../webcomponentsjs/webcomponents-lite.js"></script>
<script src="../../web-component-tester/browser.js"></script>

<link rel="import" href="../test-service.html">

<script>
define('test-service', () => {
  class TestService {
    constructor(componentA, componentB) {
      this.componentA = componentA;
      this.componentB = componentB;
    }
  }
  return TestService;
});
</script>

我该如何测试？如果我尝试简单地包含 .html 文件，我将无法访问 TestService.

Answer 1

这是示例测试的完整 html。基本上通过 test-fixture 添加您的测试服务标签，然后查看它是否正常工作。

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, minimum-scale=1, initial-scale=1, user-scalable=yes">

    <title>test-service test</title>

    <script src="../../webcomponentsjs/webcomponents-lite.js"></script>
    <script src="../../web-component-tester/browser.js"></script>

    <link rel="import" href="../test-service.html">
</head>
<body>

<test-fixture id="BasicTestFixture">
    <template>
        <test-service></test-service>
    </template>
</test-fixture>

<script>
    suite('test-service', function() {

        test('instantiating the element with default properties works', function() {
            let testService = fixture('BasicTestFixture');
            assert.equal(testService.apiUrl, 'http://myapi.domain.com');
            // possible something like
            // let addResult = testService.addElement(...);
            // assert.equals(addResult, '{"result": "success"}');
        });

    });
</script>

</body>
</html>

Answer 2

终于想通了。这一切都与 Polymer IMD 和依赖注入有关。定义测试套件看起来与它不同：

define('test-service-test', ['test-service'], (TestService) => {
    let testServiceInstance = new TestService(1, 2);

    test('basic test', function(){
        assert.equal(testServiceInstance.componentA, 1);
        assert.equal(testServiceInstance.componentB, 2);
    })
});

如何在 Polymer 中测试服务？

How do I test services in polymer?

unit-testing

mocha.js

polymer

polymer-2.x