test(auth): Add test for ICP auth

Author: lpatino10

core/src/test/java/com/ibm/watson/developer_cloud/service/AuthenticationTest.java

@@ -3,9 +3,12 @@
 import org.junit.Test;
 
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertFalse;
 
 public class AuthenticationTest {
+  private static final String APIKEY_USERNAME = "apikey";
   private static final String APIKEY = "12345";
+  private static final String ICP_APIKEY = "icp-12345";
 
   public class TestService extends WatsonService {
     private static final String SERVICE_NAME = "test";
@@ -18,7 +21,14 @@ public TestService() {
   @Test
   public void authenticateWithApiKeyAsUsername() {
     TestService service = new TestService();
-    service.setUsernameAndPassword("apikey", APIKEY);
+    service.setUsernameAndPassword(APIKEY_USERNAME, APIKEY);
     assertTrue(service.isTokenManagerSet());
   }
+
+  @Test
+  public void authenticateWithIcp() {
+    TestService service = new TestService();
+    service.setUsernameAndPassword(APIKEY_USERNAME, ICP_APIKEY);
+    assertFalse(service.isTokenManagerSet());
+  }
 }