Added AuthoritiesService unit tests

src/test/java/ntnu/idatt2016/v233/SmartMat/service/user/AuthoritesServiceTest.java

+package ntnu.idatt2016.v233.SmartMat.service.user;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import java.util.Optional;
+
+import ntnu.idatt2016.v233.SmartMat.dto.enums.Authority;
+import ntnu.idatt2016.v233.SmartMat.entity.user.AuthorityTable;
+import ntnu.idatt2016.v233.SmartMat.entity.user.User;
+import ntnu.idatt2016.v233.SmartMat.repository.user.AuthoritesRepository;
+
+import static org.mockito.Mockito.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+class AuthoritesServiceTest {
+
+    @InjectMocks
+    private AuthoritesService authoritesService;
+
+    @Mock
+    private AuthoritesRepository authoritesRepository;
+
+    @BeforeEach
+    void setUp() {
+        MockitoAnnotations.openMocks(this);
+    }
+
+    @Test
+    void testGetAuthorityByAuth() {
+        Authority authorityType = Authority.USER;
+        AuthorityTable authorityTable = new AuthorityTable(authorityType);
+
+        when(authoritesRepository.findById(authorityType)).thenReturn(Optional.of(authorityTable));
+
+        AuthorityTable result = authoritesService.getAuthorityByAuth(authorityType);
+
+        assertEquals(authorityType, result.getAuthority());
+    }
+
+    @Test
+    void testGetAuthorityByAuthCreateNew() {
+        Authority authorityType = Authority.ADMIN;
+
+        when(authoritesRepository.findById(authorityType)).thenReturn(Optional.empty());
+        when(authoritesRepository.save(any(AuthorityTable.class))).thenAnswer(invocation -> invocation.getArgument(0));
+
+        AuthorityTable result = authoritesService.getAuthorityByAuth(authorityType);
+
+        assertEquals(authorityType, result.getAuthority());
+    }
+
+    @Test
+    void testAddUserToAuthority() {
+        Authority authorityType = Authority.USER;
+        AuthorityTable authorityTable = new AuthorityTable(authorityType);
+        User user = new User();
+        user.setUsername("testUser");
+
+        authoritesService.addUserToAuthoriy(authorityTable, user);
+
+        assertNotNull(authorityTable.getUsers());
+        assertTrue(authorityTable.getUsers().contains(user));
+    }
+}