Tests on Utils and UserResponse

src/test/java/ch/usi/inf/sa4/sanmarinoes/smarthut/UserResponseTests.java

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+package ch.usi.inf.sa4.sanmarinoes.smarthut;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import ch.usi.inf.sa4.sanmarinoes.smarthut.dto.UserResponse;
+import ch.usi.inf.sa4.sanmarinoes.smarthut.models.User;
+import org.junit.jupiter.api.Test;
+
+public class UserResponseTests {
+    @Test
+    public void testUserResponse() {
+        User u = new User();
+        u.setEmail("email@example.com");
+        u.setId(42L);
+        u.setUsername("username");
+        UserResponse us = UserResponse.fromUser(u);
+        assertEquals(us.getName(), u.getName());
+        assertEquals(us.getId(), u.getId());
+        assertEquals(us.getUsername(), u.getUsername());
+    }
+}

src/test/java/ch/usi/inf/sa4/sanmarinoes/smarthut/UtilsTests.java

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+package ch.usi.inf.sa4.sanmarinoes.smarthut;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import ch.usi.inf.sa4.sanmarinoes.smarthut.error.NotFoundException;
+import ch.usi.inf.sa4.sanmarinoes.smarthut.models.User;
+import ch.usi.inf.sa4.sanmarinoes.smarthut.models.UserRepository;
+import ch.usi.inf.sa4.sanmarinoes.smarthut.utils.Utils;
+import java.security.Principal;
+import java.util.List;
+import java.util.Optional;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+public class UtilsTests {
+
+    @Test
+    public void testToList() {
+        List<String> hormannTitles = List.of("Prof.", "Dr.", "Kai (spiritual leader)");
+        assertThat(Utils.toList(hormannTitles))
+                .containsExactly(hormannTitles.get(0), hormannTitles.get(1), hormannTitles.get(2));
+    }
+
+    @Test
+    public void testReturnIfGuest() {
+        Principal principal = Mockito.mock(Principal.class);
+        UserRepository userRepository = Mockito.mock(UserRepository.class);
+        User host = new User();
+        User guest = new User();
+        host.getGuests().add(guest);
+
+        when(userRepository.findById(1L)).thenReturn(Optional.of(host));
+        when(userRepository.findById(2L)).thenReturn(Optional.empty());
+        when(userRepository.findByUsername("user")).thenReturn(guest);
+        when(principal.getName()).thenReturn("user");
+
+        try {
+            assertThat(Utils.returnIfGuest(userRepository, "toReturn", 1L, principal))
+                    .isEqualTo("toReturn");
+        } catch (NotFoundException e) {
+            fail(e.getMessage());
+        }
+
+        assertThatThrownBy(() -> Utils.returnIfGuest(userRepository, "toReturn", 2L, principal))
+                .isInstanceOf(NotFoundException.class);
+    }
+}