Refactored MenuManagerTest for better naming convention

src/test/java/Application/MenuManagerTest.java

@@ -27,7 +27,7 @@ class MenuManagerTest {
     }
 
     @Test
-    void testSelectFunction() {
+    void select() {
         assertNull(mm.getCurrentMenu());
         mm.select(0);
         assertEquals(mm.getCurrentMenu().getName(), "Menu1");
@@ -36,14 +36,14 @@ class MenuManagerTest {
     }
 
     @Test
-    void testIsRootMenuFunction() {
+    void inRootMenu() {
         assertTrue(mm.inRootMenu());
         mm.select(0);
         assertFalse(mm.inRootMenu());
     }
 
     @Test
-    void testBackFunction() {
+    void back() {
         try {
             mm.back();
             Assertions.fail("Test failed: shouldn't be able to go back in rootMenu");