Adding tests for each class.

ambassador/pom.xml

@@ -10,6 +10,22 @@
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>ambassador</artifactId>
+    <dependencies>
+        <dependency>
+            <groupId>org.testng</groupId>
+            <artifactId>testng</artifactId>
+            <version>RELEASE</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+        </dependency>
+    </dependencies>
 
 
 </project>

ambassador/src/main/java/com/iluwatar/ambassador/Client.java

@@ -33,8 +33,9 @@ public class Client {
         serviceAmbassador = new ServiceAmbassador();
     }
 
-    void useService(int value) {
+    long useService(int value) {
         long result = serviceAmbassador.doRemoteFunction(value);
         System.out.println(result);
+        return result;
     }
 }

ambassador/src/test/java/com/iluwatar/ambassador/AppTest.java

@@ -0,0 +1,36 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014-2016 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package com.iluwatar.ambassador;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Application test
+ */
+public class AppTest {
+
+    @Test
+    public void test() {
+        App.main(new String[]{});
+    }
+}

ambassador/src/test/java/com/iluwatar/ambassador/ClientTest.java

@@ -0,0 +1,15 @@
+package com.iluwatar.ambassador;
+
+import org.junit.jupiter.api.Test;
+
+public class ClientTest {
+
+    @Test
+    public void test() {
+
+        Client client = new Client();
+        long result = client.useService(10);
+        assert result == 100 || result == -1;
+
+    }
+}

ambassador/src/test/java/com/iluwatar/ambassador/RemoteServiceTest.java

@@ -0,0 +1,16 @@
+package com.iluwatar.ambassador;
+
+import org.junit.jupiter.api.Test;
+
+public class RemoteServiceTest {
+
+    @Test
+    public void test() {
+
+        RemoteService remoteService = RemoteService.getRemoteService();
+        long result = remoteService.doRemoteFunction(10);
+
+        assert result == 100 || result == -1;
+    }
+
+}

ambassador/src/test/java/com/iluwatar/ambassador/ServiceAmbassadorTest.java

@@ -0,0 +1,13 @@
+package com.iluwatar.ambassador;
+
+import org.junit.jupiter.api.Test;
+
+public class ServiceAmbassadorTest {
+
+    @Test
+    public void test() {
+        ServiceAmbassador ambassador = new ServiceAmbassador();
+        long result = ambassador.doRemoteFunction(10);
+        assert result == 100 || result == -1;
+    }
+}