添加基础测试用例

docs/test/index.html

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+<html>
+    <head>
+        <meta charset="utf-8" />
+        <title>Mocha Tests</title>
+        <link href="https://unpkg.com/mocha@5.2.0/mocha.css" rel="stylesheet" />
+        <link href="../uncompiled/artplayer.css" rel="stylesheet" />
+        <style>
+            .artplayer-app {
+                width: 400px;
+                height: 300px;
+                margin: 20px auto;
+                opacity: 0.2;
+            }
+        </style>
+    </head>
+    <body>
+        <div class="artplayer-app"></div>
+        <div id="mocha"></div>
+        <script src="https://unpkg.com/chai/chai.js"></script>
+        <script src="https://unpkg.com/mocha@5.2.0/mocha.js"></script>
+        <script>
+            window.mocha.setup('bdd');
+            window.expect = window.chai.expect;
+        </script>
+
+        <script src="../uncompiled/artplayer.js"></script>
+        <script src="../uncompiled/artplayer-plugin-subtitle.js"></script>
+
+        <script src="./index.test.js"></script>
+        <script>
+            mocha.checkLeaks();
+            mocha.run();
+        </script>
+    </body>
+</html>

docs/test/index.test.js

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+var artBaseOption = {
+    container: '.artplayer-app',
+    url: 'https://blog.zhw-island.com/assets-cdn/video/one-more-time-one-more-chance-480p.mp4'
+}
+
+describe('Detect registration status', function() {
+    it('Constructor is a global variable', function() {
+        expect(window.Artplayer).to.be.an('function');
+        expect(window.Artplayer.version).to.be.an('string');
+        expect(window.Artplayer.env).to.be.an('string');
+        expect(window.Artplayer.config).to.be.an('object');
+        expect(window.Artplayer.utils).to.be.an('object');
+        expect(window.Artplayer.DEFAULTS).to.be.an('object');
+        expect(window.Artplayer.instances).to.be.an('array');
+    });
+
+    it('Instantiation state', function() {
+        var art = new Artplayer(artBaseOption);
+        expect(art).to.be.an('object');
+    });
+
+    it('Throw error when multiple instances on the same dom element', function() {
+        expect(function () {
+            new Artplayer(artBaseOption);
+        }).to.throw(/Cannot mount multiple instances on the same dom element/)
+    });
+});