diff --git a/tests/Math/BigInteger/BCMathTest.php b/tests/Math/BigInteger/BCMathTest.php
new file mode 100644
index 00000000..7d953b9e
--- /dev/null
+++ b/tests/Math/BigInteger/BCMathTest.php
@@ -0,0 +1,15 @@
+<?php
+/**
+ * @author     Andreas Fischer <bantu@phpbb.com>
+ * @copyright  MMXIII Andreas Fischer
+ * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+class Math_BigInteger_BCMathTest extends Math_BigInteger_TestCase
+{
+	static public function setUpBeforeClass()
+	{
+		self::ensureModeConstant('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_BCMATH);
+		parent::setUpBeforeClass();
+	}
+}
diff --git a/tests/Math/BigInteger/BigIntegerTest.php b/tests/Math/BigInteger/BigIntegerTest.php
deleted file mode 100644
index e13fd22d..00000000
--- a/tests/Math/BigInteger/BigIntegerTest.php
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-/**
- * @author     Andreas Fischer <bantu@phpbb.com>
- * @copyright  MMXIII Andreas Fischer
- * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
- */
-
-class Math_BigInteger_BigIntegerTest extends Math_BigInteger_TestCase
-{
-
-}
diff --git a/tests/Math/BigInteger/GMPTest.php b/tests/Math/BigInteger/GMPTest.php
new file mode 100644
index 00000000..2aea998b
--- /dev/null
+++ b/tests/Math/BigInteger/GMPTest.php
@@ -0,0 +1,15 @@
+<?php
+/**
+ * @author     Andreas Fischer <bantu@phpbb.com>
+ * @copyright  MMXIII Andreas Fischer
+ * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+class Math_BigInteger_GMPTest extends Math_BigInteger_TestCase
+{
+	static public function setUpBeforeClass()
+	{
+		self::ensureModeConstant('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_GMP);
+		parent::setUpBeforeClass();
+	}
+}
diff --git a/tests/Math/BigInteger/InternalTest.php b/tests/Math/BigInteger/InternalTest.php
new file mode 100644
index 00000000..dcdc9129
--- /dev/null
+++ b/tests/Math/BigInteger/InternalTest.php
@@ -0,0 +1,15 @@
+<?php
+/**
+ * @author     Andreas Fischer <bantu@phpbb.com>
+ * @copyright  MMXIII Andreas Fischer
+ * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+class Math_BigInteger_InternalTest extends Math_BigInteger_TestCase
+{
+	static public function setUpBeforeClass()
+	{
+		self::ensureModeConstant('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_INTERNAL);
+		parent::setUpBeforeClass();
+	}
+}
diff --git a/tests/Math/BigInteger/TestCase.php b/tests/Math/BigInteger/TestCase.php
index 50475cdf..74a92663 100644
--- a/tests/Math/BigInteger/TestCase.php
+++ b/tests/Math/BigInteger/TestCase.php
@@ -5,6 +5,8 @@
  * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
  */
 
+require_once 'Math/BigInteger.php';
+
 abstract class Math_BigInteger_TestCase extends PhpseclibTestCase
 {
 	public function getInstance($x = 0, $base = 10)