diff --git a/tests/Crypt/Hash/TestCase.php b/tests/Crypt/Hash/TestCase.php
new file mode 100644
index 00000000..1489acd7
--- /dev/null
+++ b/tests/Crypt/Hash/TestCase.php
@@ -0,0 +1,47 @@
+<?php
+/**
+ * @author     Andreas Fischer <bantu@phpbb.com>
+ * @copyright  MMXII Andreas Fischer
+ * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+abstract class Crypt_Hash_TestCase extends PHPUnit_Framework_TestCase
+{
+	static public function setUpBeforeClass()
+	{
+		require_once('Crypt/Hash.php');
+
+		if (!defined('CRYPT_HASH_MODE'))
+		{
+			define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_INTERNAL);
+		}
+	}
+
+	public function setUp()
+	{
+		if (defined('CRYPT_HASH_MODE') && CRYPT_HASH_MODE !== CRYPT_HASH_MODE_INTERNAL)
+		{
+			$this->markTestSkipped('Skipping test because CRYPT_HASH_MODE is not defined as CRYPT_HASH_MODE_INTERNAL.');
+		}
+	}
+
+	protected function assertHashesTo(Crypt_Hash $hash, $message, $expected)
+	{
+		$this->assertEquals(
+			strtolower($expected),
+			bin2hex($hash->hash($message)),
+			sprintf("Failed asserting that '%s' hashes to '%s'.", $message, $expected)
+		);
+	}
+
+	protected function assertHMACsTo(Crypt_Hash $hash, $key, $message, $expected)
+	{
+		$hash->setKey($key);
+
+		$this->assertEquals(
+			strtolower($expected),
+			bin2hex($hash->hash($message)),
+			sprintf("Failed asserting that '%s' HMACs to '%s' with key '%s'.", $message, $expected, $key)
+		);
+	}
+}