Added tests and method to make sure you cannot add yourself as a friend

src/Server/src/test/java/greenify/server/data/model/UserTest.java

@@ -2,8 +2,10 @@ package greenify.server.data.model;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import greenify.common.ApplicationException;
 import org.junit.Test;
 
 import java.util.ArrayList;
@@ -90,7 +92,7 @@ public class UserTest {
     }
 
     @Test
-    public void addFriend(){
+    public void addFriendTest(){
         User first = new User(1L, "greenify", "password");
         User second = new User(1L, "merel", "password");
         assertEquals(first.getFriends(), second.getFriends());
@@ -100,5 +102,13 @@ public class UserTest {
         test.add(second);
         assertEquals(first.getFriends(), test);
     }
+
+    @Test
+    public void addYourselfTest(){
+        User test = new User(1L, "greenify", "password");
+        assertEquals(test.getFriends(), new ArrayList<User>());
+        assertThrows(ApplicationException.class, () -> {
+            test.addFriend(test);
+        });    }
 }
 

src/Server/src/test/java/greenify/server/service/UserServiceTest.java

@@ -18,6 +18,8 @@ import org.springframework.boot.test.mock.mockito.MockBean;
 import org.springframework.context.annotation.Bean;
 import org.springframework.test.context.junit4.SpringRunner;
 
+import java.util.ArrayList;
+
 @RunWith(SpringRunner.class)
 public class UserServiceTest {
     @TestConfiguration
@@ -45,7 +47,9 @@ public class UserServiceTest {
         User alex = new User(1L, "alex", "password");
         when(userRepository.findByName(alex.getName()))
                 .thenReturn(alex);
-    }
+        User lola = new User(2L, "lola", "password");
+        when(userRepository.findByName(lola.getName()))
+                .thenReturn(lola);    }
 
     @Test
     public void validLoginTest() {
@@ -157,4 +161,16 @@ public class UserServiceTest {
             userService.loginUser(null, null);
         });
     }
+
+    @Test
+    public void addFriendTest() {
+        User alex = userRepository.findByName("alex");
+        User lola = userRepository.findByName("lola");
+        assertEquals(lola.getFriends(), alex.getFriends());
+        userService.addFriend("alex", "lola");
+        ArrayList<User> test = new ArrayList<User>();
+        test.add(lola);
+        assertEquals(alex.getFriends(), test);
+    }
+
 }