[3.0] Add unit test for CountTelnetHandler (apache#7845)

* [3.0] Add unit test for CountTelnetHandler (apache#7842)

* Optimize CountTelnetHandlerTest (apache#7842)

dubbo-plugin/dubbo-qos/src/test/java/org/apache/dubbo/qos/legacy/CountTelnetHandlerTest.java

@@ -0,0 +1,109 @@
+/*
+ * 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 org.apache.dubbo.qos.legacy;
+
+import org.apache.dubbo.common.URL;
+import org.apache.dubbo.qos.legacy.channel.MockChannel;
+import org.apache.dubbo.qos.legacy.service.DemoService;
+import org.apache.dubbo.remoting.telnet.TelnetHandler;
+import org.apache.dubbo.remoting.telnet.support.TelnetUtils;
+import org.apache.dubbo.rpc.Invoker;
+import org.apache.dubbo.rpc.RpcStatus;
+import org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.LinkedList;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.reset;
+
+public class CountTelnetHandlerTest {
+
+    private TelnetHandler handler = new CountTelnetHandler();
+    private MockChannel mockChannel;
+    private Invoker<DemoService> mockInvoker;
+    private URL url = URL.valueOf("dubbo://127.0.0.1:20884/demo");
+    private CountDownLatch latch;
+
+    @BeforeEach
+    public void setUp() {
+        latch = new CountDownLatch(2);
+        mockChannel = new MockChannel(url, latch);
+        mockInvoker = mock(Invoker.class);
+        given(mockInvoker.getInterface()).willReturn(DemoService.class);
+        given(mockInvoker.getUrl()).willReturn(url);
+    }
+
+    @AfterEach
+    public void tearDown() {
+        ProtocolUtils.closeAll();
+        mockChannel.close();
+        reset(mockInvoker);
+    }
+
+    @Test
+    public void test() throws Exception {
+        String methodName = "sayHello";
+        String message = "org.apache.dubbo.qos.legacy.service.DemoService sayHello 1";
+
+        DubboProtocol.getDubboProtocol().export(mockInvoker);
+        RpcStatus.beginCount(url, methodName);
+        RpcStatus.endCount(url, methodName, 10L, true);
+        handler.telnet(mockChannel, message);
+        latch.await();
+
+        StringBuilder sb = new StringBuilder();
+        for (Object o : mockChannel.getReceivedObjects()) {
+            sb.append(o.toString());
+        }
+
+        assertThat(sb.toString(), containsString(buildTable(methodName,
+                10, 10, "1", "0", "0")));
+    }
+
+    public static String buildTable(String methodName, long averageElapsed,
+                                    long maxElapsed, String total, String failed, String active) {
+        List<String> header = new LinkedList<>();
+        header.add("method");
+        header.add("total");
+        header.add("failed");
+        header.add("active");
+        header.add("average");
+        header.add("max");
+
+        List<List<String>> table = new LinkedList<>();
+        List<String> row = new LinkedList<String>();
+        row.add(methodName);
+        row.add(total);
+        row.add(failed);
+        row.add(active);
+        row.add(averageElapsed + "ms");
+        row.add(maxElapsed + "ms");
+
+        table.add(row);
+
+        return TelnetUtils.toTable(header, table);
+    }
+
+}

dubbo-plugin/dubbo-qos/src/test/java/org/apache/dubbo/qos/legacy/channel/MockChannel.java

@@ -0,0 +1,145 @@
+/*
+ * 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 org.apache.dubbo.qos.legacy.channel;
+
+import org.apache.dubbo.common.URL;
+import org.apache.dubbo.remoting.Channel;
+import org.apache.dubbo.remoting.ChannelHandler;
+import org.apache.dubbo.remoting.RemotingException;
+
+import java.net.InetSocketAddress;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.CountDownLatch;
+
+public class MockChannel implements Channel {
+    public static final String ERROR_WHEN_SEND = "error_when_send";
+    InetSocketAddress localAddress;
+    InetSocketAddress remoteAddress;
+    private URL remoteUrl;
+    private ChannelHandler handler;
+    private boolean isClosed;
+    private volatile boolean closing;
+    private Map<String, Object> attributes = new HashMap<String, Object>(1);
+    private List<Object> receivedObjects = new LinkedList<>();
+    private CountDownLatch latch;
+
+    public MockChannel() {
+
+    }
+
+    public MockChannel(URL remoteUrl) {
+        this.remoteUrl = remoteUrl;
+    }
+
+    public MockChannel(URL remoteUrl, CountDownLatch latch) {
+        this.remoteUrl = remoteUrl;
+        this.latch = latch;
+    }
+
+    public MockChannel(ChannelHandler handler) {
+        this.handler = handler;
+    }
+
+    @Override
+    public URL getUrl() {
+        return remoteUrl;
+    }
+
+    @Override
+    public ChannelHandler getChannelHandler() {
+        return handler;
+    }
+
+    @Override
+    public InetSocketAddress getLocalAddress() {
+        return localAddress;
+    }
+
+    @Override
+    public void send(Object message) throws RemotingException {
+        if (remoteUrl.getParameter(ERROR_WHEN_SEND, Boolean.FALSE)) {
+            throw new RemotingException(localAddress, remoteAddress, "mock error");
+        } else {
+            receivedObjects.add(message);
+            if (latch != null) {
+                latch.countDown();
+            }
+        }
+    }
+
+    @Override
+    public void send(Object message, boolean sent) throws RemotingException {
+        send(message);
+    }
+
+    @Override
+    public void close() {
+        close(0);
+    }
+
+    @Override
+    public void close(int timeout) {
+        isClosed = true;
+    }
+
+    @Override
+    public void startClose() {
+        closing = true;
+    }
+
+    @Override
+    public boolean isClosed() {
+        return isClosed;
+    }
+
+    @Override
+    public InetSocketAddress getRemoteAddress() {
+        return remoteAddress;
+    }
+
+    @Override
+    public boolean isConnected() {
+        return isClosed;
+    }
+
+    @Override
+    public boolean hasAttribute(String key) {
+        return attributes.containsKey(key);
+    }
+
+    @Override
+    public Object getAttribute(String key) {
+        return attributes.get(key);
+    }
+
+    @Override
+    public void setAttribute(String key, Object value) {
+        attributes.put(key, value);
+    }
+
+    @Override
+    public void removeAttribute(String key) {
+        attributes.remove(key);
+    }
+
+    public List<Object> getReceivedObjects() {
+        return receivedObjects;
+    }
+}