#297 Create unit tests for Gateway API pattern

api-gateway/src/test/java/com/iluwatar/api/gateway/ApiGatewayTest.java

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+package com.iluwatar.api.gateway;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class ApiGatewayTest {
+
+  /**
+   * Tests getting the data for a desktop client
+   */
+  @Test
+  public void testGetProductDesktop() {
+    ApiGateway apiGateway = new ApiGateway();
+    DesktopProduct desktopProduct = apiGateway.getProductDesktop();
+
+    assertEquals("20", desktopProduct.getPrice());
+    assertEquals("/product-image.png", desktopProduct.getImagePath());
+  }
+
+  /**
+   * Tests getting the data for a mobile client
+   */
+  @Test
+  public void testGetProductMobile() {
+    ApiGateway apiGateway = new ApiGateway();
+    MobileProduct mobileProduct = apiGateway.getProductMobile();
+
+    assertEquals("20", mobileProduct.getPrice());
+  }
+}

api-gateway/src/test/java/com/iluwatar/api/gateway/AppTest.java

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+package com.iluwatar.api.gateway;
+
+import org.junit.Test;
+
+/**
+ *
+ * Application test
+ *
+ */
+public class AppTest {
+
+  @Test
+  public void test() throws Exception {
+    String[] args = {};
+    App.main(args);
+  }
+}