diff --git a/tests/functional/auth_test.php b/tests/functional/auth_test.php
index e67118d8f9..3e218ebd77 100644
--- a/tests/functional/auth_test.php
+++ b/tests/functional/auth_test.php
@@ -18,16 +18,18 @@ class phpbb_functional_auth_test extends phpbb_functional_test_case
 
 		// check for logout link
 		$crawler = $this->request('GET', 'index.php');
+		$this->assert_response_success();
 		$this->assertContains($this->lang('LOGOUT_USER', 'admin'), $crawler->filter('.navbar')->text());
 	}
 
 	public function test_login_other()
 	{
-		$this->create_user('user');
-		$this->login('user');
+		$this->create_user('anothertestuser');
+		$this->login('anothertestuser');
 		$crawler = $this->request('GET', 'index.php');
-		$this->assertContains('user', $crawler->filter('.icon-logout')->text());
-		$this->delete_user('user');
+		$this->assert_response_success();
+		$this->assertContains('anothertestuser', $crawler->filter('.icon-logout')->text());
+		$this->delete_user('anothertestuser');
 	}
 
 	/**
@@ -40,10 +42,12 @@ class phpbb_functional_auth_test extends phpbb_functional_test_case
 
 		// logout
 		$crawler = $this->request('GET', 'ucp.php?sid=' . $this->sid . '&mode=logout');
+		$this->assert_response_success();
 		$this->assertContains($this->lang('LOGOUT_REDIRECT'), $crawler->filter('#message')->text());
 
 		// look for a register link, which should be visible only when logged out
 		$crawler = $this->request('GET', 'index.php');
+		$this->assert_response_success();
 		$this->assertContains($this->lang('REGISTER'), $crawler->filter('.navbar')->text());
 	}
 }
diff --git a/tests/test_framework/phpbb_functional_test_case.php b/tests/test_framework/phpbb_functional_test_case.php
index 3b6232d091..b17b2dcd5f 100644
--- a/tests/test_framework/phpbb_functional_test_case.php
+++ b/tests/test_framework/phpbb_functional_test_case.php
@@ -32,11 +32,6 @@ class phpbb_functional_test_case extends phpbb_test_case
 	*/
 	protected $lang = array();
 
-	/**
-	* @var array
-	*/
-	protected $created_users = array();
-
 	static protected $config = array();
 	static protected $already_installed = false;
 
@@ -225,14 +220,10 @@ class phpbb_functional_test_case extends phpbb_test_case
 	* requires create_user.
 	*
 	* @param string $username Also doubles up as the user's password
+	* @return int ID of created user
 	*/
 	protected function create_user($username)
 	{
-		if (isset($this->created_users[$username]))
-		{
-			return;
-		}
-		
 		// Required by unique_id
 		global $config;
 
@@ -243,17 +234,36 @@ class phpbb_functional_test_case extends phpbb_test_case
 
 		$config['rand_seed'] = '';
 		$config['rand_seed_last_update'] = time() + 600;
-		
-		$db = $this->get_db();
-		$query = "
-			INSERT INTO " . self::$config['table_prefix'] . "users
-				(user_type, group_id, username, username_clean, user_regdate, user_password, user_email, user_lang, user_style, user_rank, user_colour, user_posts, user_permissions, user_ip, user_birthday, user_lastpage, user_last_confirm_key, user_post_sortby_type, user_post_sortby_dir, user_topic_sortby_type, user_topic_sortby_dir, user_avatar, user_sig, user_sig_bbcode_uid, user_from, user_icq, user_aim, user_yim, user_msnm, user_jabber, user_website, user_occ, user_interests, user_actkey, user_newpasswd)
-			VALUES
-				(0, 2, 'user', 'user', 0, '" . phpbb_hash($username) . "', 'nobody@example.com', 'en', 1, 0, '', 1, '', '', '', '', '', 't', 'a', 't', 'd', '', '', '', '', '', '', '', '', '', '', '', '', '', '')
-		";
 
-		$db->sql_query($query);
-		$this->created_users[$username] = 1;
+		// Required by user_add
+		global $db, $cache;
+		$db = $this->get_db();
+		if (!function_exists('phpbb_mock_null_cache'))
+		{
+			require_once(__DIR__ . '/../mock/null_cache.php');
+		}
+		$cache = new phpbb_mock_null_cache;
+
+		if (!function_exists('utf_clean_string'))
+		{
+			require_once(__DIR__ . '/../../phpBB/includes/utf/utf_tools.php');
+		}
+		if (!function_exists('user_add'))
+		{
+			require_once(__DIR__ . '/../../phpBB/includes/functions_user.php');
+		}
+
+		$user_row = array(
+			'username' => $username,
+			'group_id' => 2,
+			'user_email' => 'nobody@example.com',
+			'user_type' => 0,
+			'user_lang' => 'en',
+			'user_timezone' => 0,
+			'user_dateformat' => '',
+			'user_password' => phpbb_hash($username),
+		);
+		return user_add($user_row);
 	}
 
 	/**
@@ -263,11 +273,6 @@ class phpbb_functional_test_case extends phpbb_test_case
 	*/
 	protected function delete_user($username)
 	{
-		if (isset($this->created_users[$username]))
-		{
-			unset($this->created_users[$username]);
-		}
-
 		$db = $this->get_db();
 		$query = "DELETE FROM " . self::$config['table_prefix'] . "users WHERE username = '" . $db->sql_escape($username) . "'";
 		$db->sql_query($query);
@@ -281,7 +286,9 @@ class phpbb_functional_test_case extends phpbb_test_case
 		$this->assertContains($this->lang('LOGIN_EXPLAIN_UCP'), $crawler->filter('html')->text());
 
 		$form = $crawler->selectButton($this->lang('LOGIN'))->form();
-		$login = $this->client->submit($form, array('username' => $username, 'password' => $username));
+		$crawler = $this->client->submit($form, array('username' => $username, 'password' => $username));
+		$this->assert_response_success();
+		$this->assertContains($this->lang('LOGIN_REDIRECT'), $crawler->filter('html')->text());
 
 		$cookies = $this->cookieJar->all();