fix(test): fix mocha compatible issue

Author: JiaLiPassion

Diff for: .travis.yml

@@ -42,7 +42,8 @@ script:
   - node_modules/.bin/gulp test/node
   - node simple-server.js 2>&1> server.log&
   - node ./test/webdriver/test.sauce.js
-  - yarn add [email protected] [email protected]
+  - yarn add [email protected] [email protected] [email protected]
   - yarn test:phantomjs-single
   - node_modules/.bin/karma start karma-dist-sauce-jasmine3.conf.js --single-run
+  - node_modules/.bin/karma start karma-build-sauce-selenium3-mocha.conf.js --single-run
   - node_modules/.bin/gulp test/node

Diff for: karma-build-sauce-selenium3-mocha.conf.js

@@ -8,5 +8,5 @@
 
 module.exports = function (config) {
   require('./karma-dist-mocha.conf.js')(config);
-  require('./sauce-selenium3.conf')(config);
+  require('./sauce-selenium3.conf')(config, ['SL_IE9']);
 };

Diff for: lib/mocha/mocha.ts

@@ -158,9 +158,6 @@
 
     Mocha.Runner.prototype.run = function(fn: Function) {
       this.on('test', (e: any) => {
-        if (Zone.current !== rootZone) {
-          throw new Error('Unexpected zone: ' + Zone.current.name);
-        }
         testZone = rootZone.fork(new ProxyZoneSpec());
       });
 

Diff for: test/zone-spec/async-test.spec.ts

@@ -547,4 +547,52 @@ describe('AsyncTestZoneSpec', function() {
       }));
     });
   });
+
+  describe('should be able to handle async for both beforeEach and it', () => {
+    let log: string[];
+    const AsyncTestZoneSpec = (Zone as any)['AsyncTestZoneSpec'];
+  
+    function asyncTest(testBody: () => void, finishCallback: Function, failCallback: Function) {
+      return function() {
+        const proxyZoneSpec = Zone.current.get('ProxyZoneSpec');
+        if (!proxyZoneSpec) {
+          throw new Error('ProxyZone not found!');
+        }
+        const lastDelegate = proxyZoneSpec.getDelegate();
+        // construct AsyncTestZoneSpec in parent zone
+        // to prevent infinite loop
+        Zone.current.parent.run(() => {
+          proxyZoneSpec.setDelegate(new AsyncTestZoneSpec(() => {
+            proxyZoneSpec.setDelegate(lastDelegate);
+            finishCallback();
+          }, () => {
+            proxyZoneSpec.setDelegate(lastDelegate);
+            failCallback();
+          }), 'async');
+        });
+        testBody.apply(this, arguments);
+      };
+    }
+
+    beforeEach(asyncTest(() => {
+      log = [];
+      setTimeout(() => {
+        log.push('beforeEach');
+      }, 50);
+    }, () => {
+      expect(log).toEqual(['beforeEach']);
+    }, () => {
+      fail('should not fail');
+    }));
+
+    it('should support asyncTest with an async beforeEach', asyncTest(() => {
+      setTimeout(() => {
+        log.push('timeout');
+      }, 50); 
+    }, () => {
+      expect(log).toEqual(['beforeEach', 'timeout']);
+    }, () => {
+      fail('should not fail');
+    }));
+  });
 });