Index: tests/t3lib/t3lib_pageselectTest.php
===================================================================
--- tests/t3lib/t3lib_pageselectTest.php	(revision 8082)
+++ tests/t3lib/t3lib_pageselectTest.php	(working copy)
@@ -26,7 +26,9 @@
 /**
  * Testcase for class t3lib_page
  *
- * @author	Christian Kuhn <lolli@schwarzbu.ch>
+ * @author Christian Kuhn <lolli@schwarzbu.ch>
+ * @author Oliver Klee <typo3-coding@oliverklee.de>
+ *
  * @package TYPO3
  * @subpackage t3lib
  */
@@ -110,5 +112,52 @@
 			$this->pageSelectObject->getPathFromRootline(array())
 		);
 	}
+
+
+	///////////////////////////////
+	// Tests concerning getExtURL
+	///////////////////////////////
+
+	/**
+	 * @test
+	 */
+	public function getExtUrlForDokType2ReturnsFalse() {
+		$this->assertEquals(
+			FALSE,
+			$this->pageSelectObject->getExtURL(array('doktype' => 2))
+		);
+	}
+
+	/**
+	 * @test
+	 */
+	public function getExtUrlForDokType3AndUrlType1AddsHttpSchemeToUrl() {
+		$this->assertEquals(
+			'http://www.example.com',
+			$this->pageSelectObject->getExtURL(
+				array(
+					'doktype' => 3,
+					'urltype' => 1,
+					'url' => 'www.example.com',
+				)
+			)
+		);
+	}
+
+	/**
+	 * @test
+	 */
+	public function getExtUrlForDokType3AndUrlType0PrependsSiteUrl() {
+		$this->assertEquals(
+			t3lib_div::getIndpEnv('TYPO3_SITE_URL') . 'hello/world/',
+			$this->pageSelectObject->getExtURL(
+				array(
+					'doktype' => 3,
+					'urltype' => 0,
+					'url' => 'hello/world/',
+				)
+			)
+		);
+	}
 }
 ?>
Index: tests/t3lib/t3lib_arraybrowserTest.php
===================================================================
--- tests/t3lib/t3lib_arraybrowserTest.php	(revision 0)
+++ tests/t3lib/t3lib_arraybrowserTest.php	(revision 0)
@@ -0,0 +1,72 @@
+<?php
+/***************************************************************
+* Copyright notice
+*
+* (c) 2010 Oliver Klee (typo3-coding@oliverklee.de)
+* All rights reserved
+*
+* This script is part of the TYPO3 project. The TYPO3 project is
+* free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; either version 2 of the License, or
+* (at your option) any later version.
+*
+* The GNU General Public License can be found at
+* http://www.gnu.org/copyleft/gpl.html.
+*
+* This script is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* This copyright notice MUST APPEAR in all copies of the script!
+***************************************************************/
+
+/**
+ * Testcase for the t3lib_arrayBrowser class in the TYPO3 Core.
+ *
+ * @package TYPO3
+ * @subpackage t3lib
+ *
+ * @author Oliver Klee <typo3-coding@oliverklee.de>
+ */
+class t3lib_arrayBrowserTest extends tx_phpunit_testcase {
+	/**
+	 * @var t3lib_arrayBrowser
+	 */
+	private $fixture;
+
+	public function setUp() {
+		$this->fixture = new t3lib_arrayBrowser();
+	}
+
+	public function tearDown() {
+		unset($this->fixture);
+	}
+
+
+	///////////////////////////////
+	// Tests concerning depthKeys
+	///////////////////////////////
+
+	/**
+	 * @test
+	 */
+	public function depthKeysWithEmptyFirstParameterAddsNothing() {
+		$this->assertEquals(
+			array(),
+			$this->fixture->depthKeys(array(), array())
+		);
+	}
+
+	/**
+	 * @test
+	 */
+	public function depthKeysWithNumericKeyAddsOneNumberForKeyFromFirstArray() {
+		$this->assertEquals(
+			array(0 => 1),
+			$this->fixture->depthKeys(array('foo'), array())
+		);
+	}
+}
+?>
\ No newline at end of file
Index: tests/t3lib/t3lib_csTest.php
===================================================================
--- tests/t3lib/t3lib_csTest.php	(revision 0)
+++ tests/t3lib/t3lib_csTest.php	(revision 0)
@@ -0,0 +1,79 @@
+<?php
+/***************************************************************
+* Copyright notice
+*
+* (c) 2010 Oliver Klee (typo3-coding@oliverklee.de)
+* All rights reserved
+*
+* This script is part of the TYPO3 project. The TYPO3 project is
+* free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; either version 2 of the License, or
+* (at your option) any later version.
+*
+* The GNU General Public License can be found at
+* http://www.gnu.org/copyleft/gpl.html.
+*
+* This script is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* This copyright notice MUST APPEAR in all copies of the script!
+***************************************************************/
+
+/**
+ * Testcase for the t3lib_cs class in the TYPO3 Core.
+ *
+ * @package TYPO3
+ * @subpackage t3lib
+ *
+ * @author Oliver Klee <typo3-coding@oliverklee.de>
+ */
+class t3lib_csTest extends tx_phpunit_testcase {
+	/**
+	 * @var t3lib_cs
+	 */
+	private $fixture = null;
+
+	public function setUp() {
+		$this->fixture = new t3lib_cs();
+	}
+
+	public function tearDown() {
+		unset($this->fixture);
+	}
+
+
+	////////////////////////////
+	// Tests concerning substr
+	////////////////////////////
+
+	/**
+	 * @test
+	 *
+	 * @see http://bugs.typo3.org/view.php?id=13934
+	 */
+	public function substrForEmptyStringAndNonZeroLengthReturnsEmptyString() {
+		$this->assertSame(
+			'',
+			$this->fixture->substr('utf-8', '', 0, 42)
+		);
+	}
+
+
+	/////////////////////////////////
+	// Tests concerning utf8_strlen
+	/////////////////////////////////
+
+	/**
+	 * @test
+	 */
+	public function utf8_strlenForNonEmptyAsciiOnlyStringReturnsNumberOfCharacters() {
+		$this->assertEquals(
+			10,
+			$this->fixture->utf8_strlen('good omens')
+		);
+	}
+}
+?>
\ No newline at end of file
Index: tests/t3lib/t3lib_divTest.php
===================================================================
--- tests/t3lib/t3lib_divTest.php	(revision 8082)
+++ tests/t3lib/t3lib_divTest.php	(working copy)
@@ -56,17 +56,78 @@
 	}
 
 
+	///////////////////////////////
+	// Tests concerning splitCalc
+	///////////////////////////////
+
+	/**
+	 * @test
+	 */
+	public function splitCalcForEmptyStringReturnsEmptyArray() {
+		$this->assertEquals(
+			array(),
+			t3lib_div::splitCalc('', '+-*/')
+		);
+	}
+
+	/**
+	 * @test
+	 */
+	public function splitCalcForNumberWithoutOperatorReturnsArrayWithPlusAndNumber() {
+		$this->assertEquals(
+			array(array('+', 42)),
+			t3lib_div::splitCalc('42', '+-*/')
+		);
+	}
+
+	/**
+	 * @test
+	 */
+	public function splitCalcForTwoNumbersWithAsterikReturnsFirstNumberWithPlusAndSecondNumberWithOperator() {
+		$this->assertEquals(
+			array(
+				array('+', 42),
+				array('*', 31),
+			),
+			t3lib_div::splitCalc('42 * 31', '+-*/')
+		);
+	}
+
+
+	//////////////////////////////////
+	// Tests concerning calcPriority
+	//////////////////////////////////
+
+	/**
+	 * @see calcPriorityCalculatesBasicArithmeticOperation
+	 */
+	public function calcPriorityTwoOperandsDataProvider() {
+		return array(
+			'add' => array(9, '6 + 3'),
+			'substractWithPositiveResult' => array(3, '6 - 3'),
+			'substractWithNegativeResult' => array(-3, '3 - 6'),
+			'multiply' => array(6, '2 * 3'),
+			'divide' => array(2.5, '5 / 2'),
+			'modulus' => array(1, '5 % 2'),
+			'power' => array(8, '2 ^ 3'),
+		);
+	}
+
 	/**
 	 * @test
+	 *
+	 * @dataProvider calcPriorityTwoOperandsDataProvider
+	 *
+	 * @param string $expected the expected value from calcPriority
+	 * @param string $arithmeticExpression the string to feed to calcPriority
 	 */
-	public function calcPriorityCalculatesBasicArithmeticOperation() {
-		$this->assertEquals(9, t3lib_div::calcPriority('6 + 3'));
-		$this->assertEquals(3, t3lib_div::calcPriority('6 - 3'));
-		$this->assertEquals(-3, t3lib_div::calcPriority('3 - 6'));
-		$this->assertEquals(6, t3lib_div::calcPriority('2 * 3'));
-		$this->assertEquals(2.5, t3lib_div::calcPriority('5 / 2'));
-		$this->assertEquals(1, t3lib_div::calcPriority('5 % 2'));
-		$this->assertEquals(8, t3lib_div::calcPriority('2 ^ 3'));
+	public function calcPriorityCalculatesBasicArithmeticOperation(
+		$expected, $arithmeticExpression
+	) {
+		$this->assertEquals(
+			$expected,
+			t3lib_div::calcPriority($arithmeticExpression)
+		);
 	}
 
 	/**