Test (#531)

* init

* init

* remove checkLeaks

* update browserslist

docs/test/test.js

@@ -0,0 +1,11 @@
+describe('Artplayer', function () {
+    afterEach(function () {
+        [...Artplayer.instances].forEach((art) => art.destroy());
+    });
+
+    it('Constructor', function () {
+        expect(Artplayer).to.be.an('function');
+        expect(Artplayer.instances).to.be.an('array');
+        expect(Artplayer.instances.length).to.be.equal(0);
+    });
+});