Enhance unit test (#2920)

dubbo-registry/dubbo-registry-default/src/test/java/org/apache/dubbo/registry/dubbo/RegistryDirectoryTest.java

@@ -34,7 +34,7 @@
 import org.apache.dubbo.rpc.cluster.loadbalance.RoundRobinLoadBalance;
 import org.apache.dubbo.rpc.cluster.router.script.ScriptRouter;
 import org.apache.dubbo.rpc.cluster.router.script.ScriptRouterFactory;
-
+import org.apache.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
@@ -1014,6 +1014,37 @@ public void test_Notified_acceptProtocol2() {
         List<Invoker<DemoService>> invokers = registryDirectory.list(invocation);
         Assert.assertEquals(2, invokers.size());
     }
+
+    @Test
+    public void test_Notified_withGroupFilter() {
+    	URL directoryUrl = noMeaningUrl.addParameterAndEncoded(Constants.REFER_KEY, "interface" + service + "&group=group1,group2");
+    	RegistryDirectory directory = this.getRegistryDirectory(directoryUrl);
+    	URL provider1 = URL.valueOf("dubbo://10.134.108.1:20880?methods=getXXX&group=group1&mock=false");
+    	URL provider2 = URL.valueOf("dubbo://10.134.108.1:20880?methods=getXXX&group=group2&mock=false");
+
+    	List<URL> providers = new ArrayList<>();
+    	providers.add(provider1);
+    	providers.add(provider2);
+    	directory.notify(providers); 
+
+    	invocation = new RpcInvocation();
+    	invocation.setMethodName("getXXX");
+    	List<Invoker<DemoService>> invokers = directory.list(invocation);
+
+    	Assert.assertEquals(2, invokers.size());
+    	Assert.assertTrue(invokers.get(0) instanceof MockClusterInvoker);
+    	Assert.assertTrue(invokers.get(1) instanceof MockClusterInvoker);
+
+    	directoryUrl = noMeaningUrl.addParameterAndEncoded(Constants.REFER_KEY, "interface" + service + "&group=group1");
+    	directory = this.getRegistryDirectory(directoryUrl);
+    	directory.notify(providers);
+
+    	invokers = directory.list(invocation);
+
+    	Assert.assertEquals(2, invokers.size());
+    	Assert.assertFalse(invokers.get(0) instanceof MockClusterInvoker);
+    	Assert.assertFalse(invokers.get(1) instanceof MockClusterInvoker);
+    }
 
     enum Param {
         MORGAN,