diff --git a/tests/AbstractDatabaseTest.php b/tests/AbstractDatabaseTestCase.php
similarity index 88%
rename from tests/AbstractDatabaseTest.php
rename to tests/AbstractDatabaseTestCase.php
index 12dfcb2d..2a98958f 100644
--- a/tests/AbstractDatabaseTest.php
+++ b/tests/AbstractDatabaseTestCase.php
@@ -1,7 +1,7 @@
 <?php
 namespace Szurubooru\Tests;
 
-abstract class AbstractDatabaseTest extends \PHPUnit_Framework_TestCase
+abstract class AbstractDatabaseTestCase extends \Szurubooru\Tests\AbstractTestCase
 {
 	protected $databaseConnection;
 	protected $upgradeService;
diff --git a/tests/AbstractTestCase.php b/tests/AbstractTestCase.php
new file mode 100644
index 00000000..da069619
--- /dev/null
+++ b/tests/AbstractTestCase.php
@@ -0,0 +1,10 @@
+<?php
+namespace Szurubooru\Tests;
+
+abstract class AbstractTestCase extends \PHPUnit_Framework_TestCase
+{
+	public function mock($className)
+	{
+		return $this->getMockBuilder($className)->disableOriginalConstructor()->getMock();
+	}
+}
diff --git a/tests/ConfigTest.php b/tests/ConfigTest.php
index 1806bbd0..c29759d8 100644
--- a/tests/ConfigTest.php
+++ b/tests/ConfigTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Szurubooru\Tests;
 
-final class ConfigTest extends \PHPUnit_Framework_TestCase
+final class ConfigTest extends \Szurubooru\Tests\AbstractTestCase
 {
 	private static $testFileName1;
 	private static $testFileName2;
diff --git a/tests/Dao/PostDaoTest.php b/tests/Dao/PostDaoTest.php
index bd81a9e1..9c45e890 100644
--- a/tests/Dao/PostDaoTest.php
+++ b/tests/Dao/PostDaoTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Szurubooru\Tests\Dao;
 
-final class PostDaoTest extends \Szurubooru\Tests\AbstractDatabaseTest
+final class PostDaoTest extends \Szurubooru\Tests\AbstractDatabaseTestCase
 {
 	public function testSaving()
 	{
diff --git a/tests/Dao/TokenDaoTest.php b/tests/Dao/TokenDaoTest.php
index 7763cf91..a61a16b6 100644
--- a/tests/Dao/TokenDaoTest.php
+++ b/tests/Dao/TokenDaoTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Szurubooru\Tests\Dao;
 
-final class TokenDaoTest extends \Szurubooru\Tests\AbstractDatabaseTest
+final class TokenDaoTest extends \Szurubooru\Tests\AbstractDatabaseTestCase
 {
 	public function testRetrievingByValidName()
 	{
diff --git a/tests/Dao/UserDaoTest.php b/tests/Dao/UserDaoTest.php
new file mode 100644
index 00000000..b0b0ac11
--- /dev/null
+++ b/tests/Dao/UserDaoTest.php
@@ -0,0 +1,41 @@
+<?php
+namespace Szurubooru\Tests\Dao;
+
+final class UserDaoTest extends \Szurubooru\Tests\AbstractDatabaseTestCase
+{
+	public function testRetrievingByValidName()
+	{
+		$userDao = new \Szurubooru\Dao\UserDao($this->databaseConnection);
+
+		$user = new \Szurubooru\Entities\User();
+		$user->name = 'test';
+
+		$userDao->save($user);
+		$expected = $user;
+		$actual = $userDao->getByName($user->name);
+
+		$this->assertEquals($actual, $expected);
+	}
+
+	public function testRetrievingByInvalidName()
+	{
+		$userDao = new \Szurubooru\Dao\UserDao($this->databaseConnection);
+
+		$actual = $userDao->getByName('rubbish');
+
+		$this->assertNull($actual);
+	}
+
+	public function testCheckingUserPresence()
+	{
+		$userDao = new \Szurubooru\Dao\UserDao($this->databaseConnection);
+
+		$this->assertFalse($userDao->hasAnyUsers());
+
+		$user = new \Szurubooru\Entities\User();
+		$user->name = 'test';
+		$userDao->save($user);
+
+		$this->assertTrue($userDao->hasAnyUsers());
+	}
+}
diff --git a/tests/DispatcherTest.php b/tests/DispatcherTest.php
index 1f0015d8..26405c6b 100644
--- a/tests/DispatcherTest.php
+++ b/tests/DispatcherTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Szurubooru\Tests;
 
-final class DispatcherTest extends \PHPUnit_Framework_TestCase
+final class DispatcherTest extends \Szurubooru\Tests\AbstractTestCase
 {
 	public function testDispatchingArrays()
 	{
diff --git a/tests/RouterTest.php b/tests/RouterTest.php
index 8fbfdec1..59401de6 100644
--- a/tests/RouterTest.php
+++ b/tests/RouterTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Szurubooru\Tests;
 
-final class PostDaoTest extends \PHPUnit_Framework_TestCase
+final class PostDaoTest extends \Szurubooru\Tests\AbstractTestCase
 {
 	public function testParameterlessHandling()
 	{
diff --git a/tests/Services/AuthServiceTest.php b/tests/Services/AuthServiceTest.php
index a1bfc4f6..56526e61 100644
--- a/tests/Services/AuthServiceTest.php
+++ b/tests/Services/AuthServiceTest.php
@@ -1,56 +1,54 @@
 <?php
 namespace Szurubooru\Tests\Services;
 
-class AuthServiceTest extends \PHPUnit_Framework_TestCase
+class AuthServiceTest extends \Szurubooru\Tests\AbstractTestCase
 {
+	private $passwordServiceMock;
+	private $timeServiceMock;
+	private $tokenDaoMock;
+	private $userDaoMock;
+
+	public function setUp()
+	{
+		$this->passwordServiceMock = $this->mock(\Szurubooru\Services\PasswordService::class);
+		$this->timeServiceMock = $this->mock(\Szurubooru\Services\TimeService::class);
+		$this->tokenDaoMock = $this->mock(\Szurubooru\Dao\TokenDao::class);
+		$this->userDaoMock = $this->mock(\Szurubooru\Dao\UserDao::class);
+	}
+
 	public function testInvalidUser()
 	{
-		$passwordServiceMock = $this->getPasswordServiceMock();
-		$timeServiceMock = $this->getTimeServiceMock();
-		$tokenDaoMock = $this->getTokenDaoMock();
-		$userDaoMock = $this->getUserDaoMock();
-
 		$this->setExpectedException(\InvalidArgumentException::class, 'User not found');
 
-		$authService = new \Szurubooru\Services\AuthService($passwordServiceMock, $timeServiceMock, $tokenDaoMock, $userDaoMock);
+		$authService = $this->getAuthService();
 		$authService->loginFromCredentials('dummy', 'godzilla');
 	}
 
 	public function testInvalidPassword()
 	{
-		$passwordServiceMock = $this->getPasswordServiceMock();
-		$timeServiceMock = $this->getTimeServiceMock();
-		$tokenDaoMock = $this->getTokenDaoMock();
-		$userDaoMock = $this->getUserDaoMock();
-
-		$passwordServiceMock->method('getHash')->willReturn('unmatchingHash');
+		$this->passwordServiceMock->method('getHash')->willReturn('unmatchingHash');
 
 		$testUser = new \Szurubooru\Entities\User();
 		$testUser->name = 'dummy';
 		$testUser->passwordHash = 'hash';
-		$userDaoMock->expects($this->once())->method('getByName')->willReturn($testUser);
+		$this->userDaoMock->expects($this->once())->method('getByName')->willReturn($testUser);
 
-		$authService = new \Szurubooru\Services\AuthService($passwordServiceMock, $timeServiceMock, $tokenDaoMock, $userDaoMock);
+		$authService = $this->getAuthService();
 		$this->setExpectedException(\InvalidArgumentException::class, 'Specified password is invalid');
 		$authService->loginFromCredentials('dummy', 'godzilla');
 	}
 
 	public function testValidCredentials()
 	{
-		$passwordServiceMock = $this->getPasswordServiceMock();
-		$timeServiceMock = $this->getTimeServiceMock();
-		$tokenDaoMock = $this->getTokenDaoMock();
-		$userDaoMock = $this->getUserDaoMock();
-
-		$tokenDaoMock->expects($this->once())->method('save');
-		$passwordServiceMock->method('getHash')->willReturn('hash');
+		$this->tokenDaoMock->expects($this->once())->method('save');
+		$this->passwordServiceMock->method('getHash')->willReturn('hash');
 
 		$testUser = new \Szurubooru\Entities\User();
 		$testUser->name = 'dummy';
 		$testUser->passwordHash = 'hash';
-		$userDaoMock->expects($this->once())->method('getByName')->willReturn($testUser);
+		$this->userDaoMock->expects($this->once())->method('getByName')->willReturn($testUser);
 
-		$authService = new \Szurubooru\Services\AuthService($passwordServiceMock, $timeServiceMock, $tokenDaoMock, $userDaoMock);
+		$authService = $this->getAuthService();
 		$authService->loginFromCredentials('dummy', 'godzilla');
 
 		$this->assertTrue($authService->isLoggedIn());
@@ -61,37 +59,27 @@ class AuthServiceTest extends \PHPUnit_Framework_TestCase
 
 	public function testInvalidToken()
 	{
-		$passwordServiceMock = $this->getPasswordServiceMock();
-		$timeServiceMock = $this->getTimeServiceMock();
-		$tokenDaoMock = $this->getTokenDaoMock();
-		$userDaoMock = $this->getUserDaoMock();
-
-		$tokenDaoMock->expects($this->once())->method('getByName')->willReturn(null);
+		$this->tokenDaoMock->expects($this->once())->method('getByName')->willReturn(null);
 
 		$this->setExpectedException(\Exception::class);
-		$authService = new \Szurubooru\Services\AuthService($passwordServiceMock, $timeServiceMock, $tokenDaoMock, $userDaoMock);
+		$authService = $this->getAuthService();
 		$authService->loginFromToken('');
 	}
 
 	public function testValidToken()
 	{
-		$passwordServiceMock = $this->getPasswordServiceMock();
-		$timeServiceMock = $this->getTimeServiceMock();
-		$tokenDaoMock = $this->getTokenDaoMock();
-		$userDaoMock = $this->getUserDaoMock();
-
 		$testUser = new \Szurubooru\Entities\User();
 		$testUser->id = 5;
 		$testUser->name = 'dummy';
 		$testUser->passwordHash = 'hash';
-		$userDaoMock->expects($this->once())->method('getById')->willReturn($testUser);
+		$this->userDaoMock->expects($this->once())->method('getById')->willReturn($testUser);
 
 		$testToken = new \Szurubooru\Entities\Token();
 		$testToken->name = 'dummy_token';
 		$testToken->additionalData = $testUser->id;
-		$tokenDaoMock->expects($this->once())->method('getByName')->willReturn($testToken);
+		$this->tokenDaoMock->expects($this->once())->method('getByName')->willReturn($testToken);
 
-		$authService = new \Szurubooru\Services\AuthService($passwordServiceMock, $timeServiceMock, $tokenDaoMock, $userDaoMock);
+		$authService = $this->getAuthService();
 		$authService->loginFromToken($testToken->name);
 
 		$this->assertTrue($authService->isLoggedIn());
@@ -100,23 +88,12 @@ class AuthServiceTest extends \PHPUnit_Framework_TestCase
 		$this->assertNotNull($authService->getLoginToken()->name);
 	}
 
-	private function getTokenDaoMock()
+	private function getAuthService()
 	{
-		return $this->getMockBuilder(\Szurubooru\Dao\TokenDao::class)->disableOriginalConstructor()->getMock();
-	}
-
-	private function getUserDaoMock()
-	{
-		return $this->getMockBuilder(\Szurubooru\Dao\UserDao::class)->disableOriginalConstructor()->getMock();
-	}
-
-	private function getPasswordServiceMock()
-	{
-		return $this->getMockBuilder(\Szurubooru\Services\PasswordService::class)->disableOriginalConstructor()->getMock();
-	}
-
-	private function getTimeServiceMock()
-	{
-		return $this->getMockBuilder(\Szurubooru\Services\TimeService::class)->disableOriginalConstructor()->getMock();
+		return new \Szurubooru\Services\AuthService(
+			$this->passwordServiceMock,
+			$this->timeServiceMock,
+			$this->tokenDaoMock,
+			$this->userDaoMock);
 	}
 }
diff --git a/tests/Services/EmailServiceTest.php b/tests/Services/EmailServiceTest.php
index 18865f4a..2ba5c067 100644
--- a/tests/Services/EmailServiceTest.php
+++ b/tests/Services/EmailServiceTest.php
@@ -1,7 +1,7 @@
 <?php
 namespace Szurubooru\Tests\Services;
 
-class EmailServiceTest extends \PHPUnit_Framework_TestCase
+class EmailServiceTest extends \Szurubooru\Tests\AbstractTestCase
 {
 	public function testEmailWithoutAt()
 	{