AppTest: comment out unused for warnings

src/test/java/AppTest.java

@@ -2,11 +2,11 @@
  * This Java source file was generated by the Gradle 'init' task.
  */
 import org.junit.Test;
-import static org.junit.Assert.*;
+//import static org.junit.Assert.*;
 
 public class AppTest {
     @Test public void testAppHasAGreeting() {
-        App classUnderTest = new App();
+        //App classUnderTest = new App();
         //assertNotNull("app should have a greeting", classUnderTest.getGreeting());
     }
 }