Added a couple of unit tests for UserService login

src/test/java/com/commafeed/backend/service/UserServiceTest.java

@@ -0,0 +1,108 @@
+package com.commafeed.backend.service;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyString;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.commafeed.backend.dao.UserDAO;
+import com.commafeed.backend.model.User;
+import com.google.common.base.Optional;
+
+
+public class UserServiceTest {
+	
+	@Test public void 
+	calling_login_should_not_return_user_object_when_given_null_nameOrEmail() {
+		UserService service = new UserService(null, null, null, null, null, null);
+		
+		Optional<User> user = service.login(null, "password");
+		
+		Assert.assertFalse(user.isPresent());
+	}
+	
+	@Test public void
+	calling_login_should_not_return_user_object_when_given_null_password() {
+		UserService service = new UserService(null, null, null, null, null, null);
+		
+		Optional<User> user = service.login("testusername", null);
+		
+		Assert.assertFalse(user.isPresent());
+	}
+	
+	@Test public void
+	calling_login_should_lookup_user_by_name() {
+		UserDAO dao = mock(UserDAO.class);
+		
+		UserService service = new UserService(null, dao, null, null, null, null);
+		service.login("test", "password");
+		
+		verify(dao).findByName("test");
+	}
+	
+	@Test public void
+	calling_login_should_lookup_user_by_email_if_lookup_by_name_failed() {
+		UserDAO dao = mock(UserDAO.class);
+		when(dao.findByName("test@test.com")).thenReturn(null);
+		
+		UserService service = new UserService(null, dao, null, null, null, null);
+		service.login("test@test.com", "password");
+		
+		verify(dao).findByEmail("test@test.com");
+	}
+	
+	@Test public void
+	calling_login_should_not_return_user_object_if_user_is_disabled() {
+		// Make a disabled user
+		User disabledUser = new User();
+		disabledUser.setDisabled(true);
+		
+		// Mock DAO to return the disabled user
+		UserDAO dao = mock(UserDAO.class);
+		when(dao.findByName("test")).thenReturn(disabledUser);
+		
+		// Create service with mocked DAO
+		UserService service = new UserService(null, dao, null, null, null, null);
+		
+		// Try to login as the disabled user
+		Optional<User> user = service.login("test", "password");
+		
+		Assert.assertFalse(user.isPresent());
+	}
+	
+	@Test public void
+	calling_login_should_try_to_authenticate_user_who_is_not_disabled() {
+		// Make a user who is not disabled
+		User user = new User();
+		user.setDisabled(false);
+		
+		// Set the encryptedPassword on the user
+		byte[] encryptedPassword = new byte[]{5,6,7};
+		user.setPassword(encryptedPassword);
+		
+		// Set a salt for this user
+		byte[] salt = new byte[]{1,2,3};
+		user.setSalt(salt);
+		
+		// Mock DAO to return the user
+		UserDAO dao = mock(UserDAO.class);
+		when(dao.findByName("test")).thenReturn(user);
+		
+		// Mock PasswordEncryptionService
+		PasswordEncryptionService encryptionService = mock(PasswordEncryptionService.class);
+		when(encryptionService.authenticate(anyString(), any(byte[].class), any(byte[].class))).thenReturn(false);
+		
+		// Create service with mocks
+		UserService service = new UserService(null, dao, null, null, encryptionService, null);
+		
+		// Try to login as the user
+		service.login("test", "password");
+		
+		verify(encryptionService).authenticate("password", encryptedPassword, salt);
+	}
+
+}