diff --git a/tests/AbstractTestCase.php b/tests/AbstractTestCase.php
index 98c5e5eb..9a537fa5 100644
--- a/tests/AbstractTestCase.php
+++ b/tests/AbstractTestCase.php
@@ -7,6 +7,11 @@ abstract class AbstractTestCase extends \PHPUnit_Framework_TestCase
 	{
 		return $this->getMockBuilder($className)->disableOriginalConstructor()->getMock();
 	}
+
+	public function mockConfig()
+	{
+		return new ConfigMock();
+	}
 }
 
 date_default_timezone_set('UTC');
diff --git a/tests/ConfigMock.php b/tests/ConfigMock.php
new file mode 100644
index 00000000..8212844a
--- /dev/null
+++ b/tests/ConfigMock.php
@@ -0,0 +1,19 @@
+<?php
+namespace Szurubooru\Tests;
+
+class ConfigMock extends \Szurubooru\Config
+{
+	public function set($key, $value)
+	{
+		$keys = preg_split('/[\\/]/', $key);
+		$current = $this;
+		$lastKey = array_pop($keys);
+		foreach ($keys as $key)
+		{
+			if (!isset($current->$key))
+				$current->$key = new \ArrayObject([], \ArrayObject::ARRAY_AS_PROPS);
+			$current = $current->$key;
+		}
+		$current->$lastKey = $value;
+	}
+}
diff --git a/tests/Services/AuthServiceTest.php b/tests/Services/AuthServiceTest.php
index 70cad944..5f3173ad 100644
--- a/tests/Services/AuthServiceTest.php
+++ b/tests/Services/AuthServiceTest.php
@@ -13,7 +13,7 @@ class AuthServiceTest extends \Szurubooru\Tests\AbstractTestCase
 	public function setUp()
 	{
 		$this->validatorMock = $this->mock(\Szurubooru\Validator::class);
-		$this->configMock = $this->mock(\Szurubooru\Config::class);
+		$this->configMock = $this->mockConfig();
 		$this->passwordServiceMock = $this->mock(\Szurubooru\Services\PasswordService::class);
 		$this->timeServiceMock = $this->mock(\Szurubooru\Services\TimeService::class);
 		$this->tokenDaoMock = $this->mock(\Szurubooru\Dao\TokenDao::class);
diff --git a/tests/Services/UserServiceTest.php b/tests/Services/UserServiceTest.php
index a421a3dc..1a83a1db 100644
--- a/tests/Services/UserServiceTest.php
+++ b/tests/Services/UserServiceTest.php
@@ -13,7 +13,7 @@ final class UserServiceTest extends \Szurubooru\Tests\AbstractTestCase
 
 	public function setUp()
 	{
-		$this->configMock = $this->mock(\Szurubooru\Config::class);
+		$this->configMock = $this->mockConfig();
 		$this->validatorMock = $this->mock(\Szurubooru\Validator::class);
 		$this->userDaoMock = $this->mock(\Szurubooru\Dao\UserDao::class);
 		$this->userSearchService = $this->mock(\Szurubooru\Dao\Services\UserSearchService::class);
@@ -29,8 +29,7 @@ final class UserServiceTest extends \Szurubooru\Tests\AbstractTestCase
 		$expected = [$mockUser];
 		$this->userSearchService->method('getFiltered')->willReturn($expected);
 
-		$this->configMock->users = new \StdClass;
-		$this->configMock->users->usersPerPage = 1;
+		$this->configMock->set('users/usersPerPage', 1);
 		$searchFormData = new \Szurubooru\FormData\SearchFormData;
 		$searchFormData->query = '';
 		$searchFormData->order = 'joined';
diff --git a/tests/ValidatorTest.php b/tests/ValidatorTest.php
index b6ff79d7..684ac484 100644
--- a/tests/ValidatorTest.php
+++ b/tests/ValidatorTest.php
@@ -3,11 +3,11 @@ namespace Szurubooru\Tests;
 
 final class ValidatorTest extends \Szurubooru\Tests\AbstractTestCase
 {
-	private $config;
+	private $configMock;
 
 	public function setUp()
 	{
-		$this->config = new \Szurubooru\Config();
+		$this->configMock = $this->mockConfig();
 	}
 
 	public function testMinLengthName()
@@ -34,9 +34,8 @@ final class ValidatorTest extends \Szurubooru\Tests\AbstractTestCase
 
 	public function testEmptyUserName()
 	{
-		$this->config->users = new \StdClass;
-		$this->config->users->minUserNameLength = 0;
-		$this->config->users->maxUserNameLength = 1;
+		$this->configMock->set('users/minUserNameLength', 0);
+		$this->configMock->set('users/maxUserNameLength', 1);
 		$this->setExpectedException(\Exception::class, 'User name cannot be empty');
 		$userName = '';
 		$validator = $this->getValidator();
@@ -45,9 +44,8 @@ final class ValidatorTest extends \Szurubooru\Tests\AbstractTestCase
 
 	public function testTooShortUserName()
 	{
-		$this->config->users = new \StdClass;
-		$this->config->users->minUserNameLength = 30;
-		$this->config->users->maxUserNameLength = 50;
+		$this->configMock->set('users/minUserNameLength', 30);
+		$this->configMock->set('users/maxUserNameLength', 50);
 		$this->setExpectedException(\Exception::class, 'User name must have at least 30 character(s)');
 		$userName = 'godzilla';
 		$validator = $this->getValidator();
@@ -56,9 +54,8 @@ final class ValidatorTest extends \Szurubooru\Tests\AbstractTestCase
 
 	public function testTooLongUserName()
 	{
-		$this->config->users = new \StdClass;
-		$this->config->users->minUserNameLength = 30;
-		$this->config->users->maxUserNameLength = 50;
+		$this->configMock->set('users/minUserNameLength', 30);
+		$this->configMock->set('users/maxUserNameLength', 50);
 		$this->setExpectedException(\Exception::class, 'User name must have at most 50 character(s)');
 		$userName = 'godzilla' . str_repeat('a', 50);
 		$validator = $this->getValidator();
@@ -67,9 +64,8 @@ final class ValidatorTest extends \Szurubooru\Tests\AbstractTestCase
 
 	public function testUserNameWithSpaces()
 	{
-		$this->config->users = new \StdClass;
-		$this->config->users->minUserNameLength = 0;
-		$this->config->users->maxUserNameLength = 100;
+		$this->configMock->set('users/minUserNameLength', 0);
+		$this->configMock->set('users/maxUserNameLength', 100);
 		$userName = ' godzilla ';
 		$validator = $this->getValidator();
 		$validator->validateUserName($userName);
@@ -78,9 +74,8 @@ final class ValidatorTest extends \Szurubooru\Tests\AbstractTestCase
 
 	public function testUserNameWithInvalidCharacters()
 	{
-		$this->config->users = new \StdClass;
-		$this->config->users->minUserNameLength = 0;
-		$this->config->users->maxUserNameLength = 100;
+		$this->configMock->set('users/minUserNameLength', 0);
+		$this->configMock->set('users/maxUserNameLength', 100);
 		$userName = '..:xXx:godzilla:xXx:..';
 		$this->setExpectedException(\Exception::class, 'User name may contain only');
 		$validator = $this->getValidator();
@@ -109,8 +104,7 @@ final class ValidatorTest extends \Szurubooru\Tests\AbstractTestCase
 
 	public function testEmptyPassword()
 	{
-		$this->config->security = new \StdClass;
-		$this->config->security->minPasswordLength = 0;
+		$this->configMock->set('security/minPasswordLength', 0);
 		$this->setExpectedException(\Exception::class, 'Password cannot be empty');
 		$validator = $this->getValidator();
 		$validator->validatePassword('');
@@ -118,8 +112,7 @@ final class ValidatorTest extends \Szurubooru\Tests\AbstractTestCase
 
 	public function testTooShortPassword()
 	{
-		$this->config->security = new \StdClass;
-		$this->config->security->minPasswordLength = 10000;
+		$this->configMock->set('security/minPasswordLength', 10000);
 		$this->setExpectedException(\Exception::class, 'Password must have at least 10000 character(s)');
 		$validator = $this->getValidator();
 		$validator->validatePassword('password123');
@@ -127,8 +120,7 @@ final class ValidatorTest extends \Szurubooru\Tests\AbstractTestCase
 
 	public function testNonAsciiPassword()
 	{
-		$this->config->security = new \StdClass;
-		$this->config->security->minPasswordLength = 0;
+		$this->configMock->set('security/minPasswordLength', 0);
 		$this->setExpectedException(\Exception::class, 'Password may contain only');
 		$validator = $this->getValidator();
 		$validator->validatePassword('良いパスワード');
@@ -136,14 +128,13 @@ final class ValidatorTest extends \Szurubooru\Tests\AbstractTestCase
 
 	public function testValidPassword()
 	{
-		$this->config->security = new \StdClass;
-		$this->config->security->minPasswordLength = 0;
+		$this->configMock->set('security/minPasswordLength', 0);
 		$validator = $this->getValidator();
 		$this->assertNull($validator->validatePassword('password'));
 	}
 
 	private function getValidator()
 	{
-		return new \Szurubooru\Validator($this->config);
+		return new \Szurubooru\Validator($this->configMock);
 	}
 }