Adding HubConnection Tests for the Java Client(#2550)

clients/java/signalr/src/main/java/HubConnection.java

@@ -5,18 +5,18 @@ import java.net.URISyntaxException;
 import java.util.HashMap;
 
 public class HubConnection {
-    private String _url;
-    private Transport _transport;
+    private String url;
+    private Transport transport;
     private OnReceiveCallBack callback;
     private HashMap<String, Action> handlers = new HashMap<>();
     private HubProtocol protocol;
 
     public Boolean connected = false;
 
-    public HubConnection(String url) {
-        _url = url;
-        protocol = new JsonHubProtocol();
-        callback = (payload) -> {
+    public HubConnection(String url, Transport transport){
+        this.url = url;
+        this.protocol = new JsonHubProtocol();
+        this.callback = (payload) -> {
 
             InvocationMessage[] messages = protocol.parseMessages(payload);
 
@@ -29,28 +29,36 @@ public class HubConnection {
             }
         };
 
-        try {
-            _transport = new WebSocketTransport(_url);
-        } catch (URISyntaxException e) {
-            e.printStackTrace();
+        if (transport == null){
+            try {
+                this.transport = new WebSocketTransport(this.url);
+            } catch (URISyntaxException e) {
+                e.printStackTrace();
+            }
+        } else {
+            this.transport = transport;
         }
     }
 
+    public HubConnection(String url) {
+        this(url, null);
+    }
+
     public void start() throws InterruptedException {
-        _transport.setOnReceive(this.callback);
-        _transport.start();
+        transport.setOnReceive(this.callback);
+        transport.start();
         connected = true;
     }
 
     public void stop(){
-        _transport.stop();
+        transport.stop();
         connected = false;
     }
 
     public void send(String method, Object... args) {
         InvocationMessage invocationMessage = new InvocationMessage(method, args);
         String message = protocol.writeMessage(invocationMessage);
-        _transport.send(message);
+        transport.send(message);
     }
 
     public void On(String target, Action callback) {

clients/java/signalr/src/test/java/HubConnectionTest.java

@@ -1,13 +1,86 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+import com.google.gson.JsonArray;
 import org.junit.Test;
 
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicReference;
+
 import static org.junit.Assert.*;
 
 public class HubConnectionTest {
-    // Coming soon!
     @Test
-    public void testEmptyCollection() {
+    public void checkHubConnectionState() throws InterruptedException {
+        Transport mockTransport = new MockEchoTransport();
+        HubConnection hubConnection = new HubConnection("http://example.com", mockTransport);
+        hubConnection.start();
+        assertTrue(hubConnection.connected);
+
+        hubConnection.stop();
+        assertFalse(hubConnection.connected);
+    }
+
+    @Test
+    public void SendWithNoParamsTriggersOnHandler() throws InterruptedException {
+        AtomicInteger value = new AtomicInteger(0);
+        Transport mockTransport = new MockEchoTransport();
+        HubConnection hubConnection = new HubConnection("http://example.com", mockTransport);
+
+        Action callback = (param) -> {
+            assertEquals(0, value.get());
+            value.incrementAndGet();
+        };
+        hubConnection.On("inc", callback);
+
+        hubConnection.start();
+        hubConnection.send("inc");
+
+        // Confirming that our handler was called and that the counter property was incremented.
+        assertEquals(1, value.get());
+    }
+
+    @Test
+    public void SendWithParamTriggersOnHandler() throws InterruptedException {
+        AtomicReference<String> value = new AtomicReference<>();
+        Transport mockTransport = new MockEchoTransport();
+        HubConnection hubConnection = new HubConnection("http://example.com", mockTransport);
+
+        Action callback = (param) -> {
+            assertNull(value.get());
+            value.set(((JsonArray) param).get(0).getAsString());
+        };
+        hubConnection.On("inc", callback);
+
+        hubConnection.start();
+        hubConnection.send("inc", "Hello World");
+
+        // Confirming that our handler was called and the correct message was passed in.
+        assertEquals("Hello World", value.get());
+    }
+
+    private class MockEchoTransport implements Transport {
+        private OnReceiveCallBack onReceiveCallBack;
+
+        @Override
+        public void start() {}
+
+        @Override
+        public void send(String message) {
+            this.onReceive(message);
+        }
+
+        @Override
+        public void setOnReceive(OnReceiveCallBack callback) {
+            this.onReceiveCallBack = callback;
+        }
+
+        @Override
+        public void onReceive(String message) {
+            this.onReceiveCallBack.invoke(message);
+        }
+
+        @Override
+        public void stop() {return;}
     }
 }