test(backend): UserRepository invocation and UserService register

Signed-off-by: Márk Kővári <kovarimarkofficial@gmail.com>

backend/src/test/java/com/greenfoxacademy/backend/controller/UserRegistrationTest.java

@@ -0,0 +1,39 @@
+package com.greenfoxacademy.backend.controller;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import com.greenfoxacademy.backend.dtos.RegisterUserDto;
+import com.greenfoxacademy.backend.repositories.UserRepository;
+import com.greenfoxacademy.backend.services.UserService;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.jdbc.AutoConfigureTestDatabase;
+import org.springframework.boot.test.context.SpringBootTest;
+
+/**
+ * This class runs a test that verifies if a user is successfully registered in the database.
+ */
+@SpringBootTest
+@AutoConfigureTestDatabase
+public class UserRegistrationTest {
+
+  @Autowired
+  private UserService userService;
+
+  @Autowired
+  private UserRepository userRepository;
+
+  @Test
+  public void userIsSuccessfulRegisteredInDatabase() {
+    RegisterUserDto newUser = new RegisterUserDto();
+    newUser.setFirstName("John");
+    newUser.setLastName("Doe");
+    newUser.setEmail("john.doe@example.com");
+    newUser.setPassword("password");
+
+    userService.register(newUser);
+
+    boolean isRegistered = userRepository.existsByEmail("john.doe@example.com");
+    assertTrue(isRegistered);
+  }
+}

backend/src/test/java/com/greenfoxacademy/backend/controller/UserServiceTest.java

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+package com.greenfoxacademy.backend.controller;
+
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import com.greenfoxacademy.backend.dtos.RegisterUserDto;
+import com.greenfoxacademy.backend.repositories.UserRepository;
+import com.greenfoxacademy.backend.services.UserService;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+/**
+ * This class runs a test to verify if the register method in the userService is properly called.
+ */
+@ExtendWith(MockitoExtension.class)
+public class UserServiceTest {
+
+  @Mock
+  private UserService userService;
+  @Mock
+  private UserRepository userRepository;
+
+  @InjectMocks
+  private UserController userController;
+
+  @Test
+  public void registerMethodIsSuccessfullyCalled() {
+    RegisterUserDto registerUserDto = new RegisterUserDto();
+    registerUserDto.setFirstName("John");
+    registerUserDto.setLastName("Doe");
+    registerUserDto.setEmail("john.doe@gmail.com");
+    registerUserDto.setPassword("password");
+
+    userService.register(registerUserDto);
+
+    verify(userService, times(1)).register(registerUserDto);
+
+  }
+
+}