[Dubbo-1693] Enhance the test coverage part-14 (apache#1859)

* add testcase

* remove useless code

dubbo-remoting/dubbo-remoting-netty4/pom.xml

@@ -44,5 +44,11 @@
             <groupId>io.netty</groupId>
             <artifactId>netty-all</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>dubbo-serialization-hessian2</artifactId>
+            <version>${project.parent.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>

dubbo-remoting/dubbo-remoting-netty4/src/test/java/com/alibaba/dubbo/remoting/transport/netty4/ClientReconnectTest.java

@@ -0,0 +1,97 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.dubbo.remoting.transport.netty4;
+
+import com.alibaba.dubbo.common.Constants;
+import com.alibaba.dubbo.common.utils.DubboAppender;
+import com.alibaba.dubbo.common.utils.NetUtils;
+import com.alibaba.dubbo.remoting.Channel;
+import com.alibaba.dubbo.remoting.Client;
+import com.alibaba.dubbo.remoting.RemotingException;
+import com.alibaba.dubbo.remoting.Server;
+import com.alibaba.dubbo.remoting.exchange.Exchangers;
+import com.alibaba.dubbo.remoting.exchange.support.ExchangeHandlerAdapter;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Client reconnect test
+ */
+public class ClientReconnectTest {
+    public static void main(String[] args) {
+        System.out.println(3 % 1);
+    }
+
+    @Before
+    public void clear() {
+        DubboAppender.clear();
+    }
+
+    @Test
+    public void testReconnect() throws RemotingException, InterruptedException {
+        {
+            int port = NetUtils.getAvailablePort();
+            Client client = startClient(port, 200);
+            Assert.assertEquals(false, client.isConnected());
+            Server server = startServer(port);
+            for (int i = 0; i < 100 && !client.isConnected(); i++) {
+                Thread.sleep(10);
+            }
+            Assert.assertEquals(true, client.isConnected());
+            client.close(2000);
+            server.close(2000);
+        }
+        {
+            int port = NetUtils.getAvailablePort();
+            Client client = startClient(port, 20000);
+            Assert.assertEquals(false, client.isConnected());
+            Server server = startServer(port);
+            for (int i = 0; i < 5; i++) {
+                Thread.sleep(200);
+            }
+            Assert.assertEquals(false, client.isConnected());
+            client.close(2000);
+            server.close(2000);
+        }
+    }
+
+
+    public Client startClient(int port, int reconnectPeriod) throws RemotingException {
+        final String url = "exchange://127.0.0.1:" + port + "/client.reconnect.test?client=netty4&check=false&" + Constants.RECONNECT_KEY + "=" + reconnectPeriod;
+        return Exchangers.connect(url);
+    }
+
+    public Server startServer(int port) throws RemotingException {
+        final String url = "exchange://127.0.0.1:" + port + "/client.reconnect.test?server=netty4";
+        return Exchangers.bind(url, new HandlerAdapter());
+    }
+
+    static class HandlerAdapter extends ExchangeHandlerAdapter {
+        @Override
+        public void connected(Channel channel) throws RemotingException {
+        }
+
+        @Override
+        public void disconnected(Channel channel) throws RemotingException {
+        }
+
+        @Override
+        public void caught(Channel channel, Throwable exception) throws RemotingException {
+        }
+    }
+}

dubbo-remoting/dubbo-remoting-netty4/src/test/java/com/alibaba/dubbo/remoting/transport/netty4/ClientToServerTest.java

@@ -0,0 +1,71 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.dubbo.remoting.transport.netty4;
+
+import com.alibaba.dubbo.remoting.RemotingException;
+import com.alibaba.dubbo.remoting.exchange.ExchangeChannel;
+import com.alibaba.dubbo.remoting.exchange.ExchangeServer;
+import com.alibaba.dubbo.remoting.exchange.ResponseFuture;
+import com.alibaba.dubbo.remoting.exchange.support.Replier;
+import junit.framework.TestCase;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * ClientToServer
+ */
+public abstract class ClientToServerTest extends TestCase {
+
+    protected static final String LOCALHOST = "127.0.0.1";
+
+    protected ExchangeServer server;
+
+    protected ExchangeChannel client;
+
+    protected WorldHandler handler = new WorldHandler();
+
+    protected abstract ExchangeServer newServer(int port, Replier<?> receiver) throws RemotingException;
+
+    protected abstract ExchangeChannel newClient(int port) throws RemotingException;
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        int port = (int) (1000 * Math.random() + 10000);
+        server = newServer(port, handler);
+        client = newClient(port);
+    }
+
+    @Override
+    protected void tearDown() throws Exception {
+        super.tearDown();
+        try {
+            if (server != null)
+                server.close();
+        } finally {
+            if (client != null)
+                client.close();
+        }
+    }
+
+    @Test
+    public void testFuture() throws Exception {
+        ResponseFuture future = client.request(new World("world"));
+        Hello result = (Hello) future.get();
+        Assert.assertEquals("hello,world", result.getName());
+    }
+}

dubbo-remoting/dubbo-remoting-netty4/src/test/java/com/alibaba/dubbo/remoting/transport/netty4/ClientsTest.java

@@ -0,0 +1,54 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.dubbo.remoting.transport.netty4;
+
+import com.alibaba.dubbo.common.extension.ExtensionLoader;
+import com.alibaba.dubbo.remoting.Transporter;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+import static org.junit.matchers.JUnitMatchers.containsString;
+
+public class ClientsTest {
+    @Test
+    public void testGetTransportEmpty() {
+        try {
+            ExtensionLoader.getExtensionLoader(Transporter.class).getExtension("");
+            fail();
+        } catch (IllegalArgumentException expected) {
+            assertThat(expected.getMessage(), containsString("Extension name == null"));
+        }
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void testGetTransportNull() {
+        String name = null;
+        ExtensionLoader.getExtensionLoader(Transporter.class).getExtension(name);
+    }
+
+    @Test
+    public void testGetTransport3() {
+        String name = "netty4";
+        assertEquals(NettyTransporter.class, ExtensionLoader.getExtensionLoader(Transporter.class).getExtension(name).getClass());
+    }
+
+    @Test(expected = IllegalStateException.class)
+    public void testGetTransportWrong() {
+        String name = "nety";
+        assertNull(ExtensionLoader.getExtensionLoader(Transporter.class).getExtension(name).getClass());
+    }
+}

dubbo-remoting/dubbo-remoting-netty4/src/test/java/com/alibaba/dubbo/remoting/transport/netty4/Hello.java

@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.dubbo.remoting.transport.netty4;
+
+import java.io.Serializable;
+
+/**
+ * Result
+ */
+public class Hello implements Serializable {
+
+    private static final long serialVersionUID = 753429849957096150L;
+
+    private String name;
+
+    public Hello() {
+    }
+
+    public Hello(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+}

dubbo-remoting/dubbo-remoting-netty4/src/test/java/com/alibaba/dubbo/remoting/transport/netty4/NettyClientToServerTest.java

@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.dubbo.remoting.transport.netty4;
+
+import com.alibaba.dubbo.common.URL;
+import com.alibaba.dubbo.remoting.RemotingException;
+import com.alibaba.dubbo.remoting.exchange.ExchangeChannel;
+import com.alibaba.dubbo.remoting.exchange.ExchangeServer;
+import com.alibaba.dubbo.remoting.exchange.Exchangers;
+import com.alibaba.dubbo.remoting.exchange.support.Replier;
+
+/**
+ * Netty4ClientToServerTest
+ */
+public class NettyClientToServerTest extends ClientToServerTest {
+
+    protected ExchangeServer newServer(int port, Replier<?> receiver) throws RemotingException {
+        return Exchangers.bind(URL.valueOf("exchange://localhost:" + port + "?server=netty4"), receiver);
+    }
+
+    protected ExchangeChannel newClient(int port) throws RemotingException {
+        return Exchangers.connect(URL.valueOf("exchange://localhost:" + port + "?client=netty4"));
+    }
+
+}

dubbo-remoting/dubbo-remoting-netty4/src/test/java/com/alibaba/dubbo/remoting/transport/netty4/World.java

@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.dubbo.remoting.transport.netty4;
+
+import java.io.Serializable;
+
+/**
+ * Data
+ */
+public class World implements Serializable {
+
+    private static final long serialVersionUID = 8563900571013747774L;
+
+    private String name;
+
+    public World() {
+    }
+
+    public World(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+}