Index: tests/t3lib/t3lib_divTest.php
===================================================================
--- tests/t3lib/t3lib_divTest.php	(revision 8127)
+++ tests/t3lib/t3lib_divTest.php	(working copy)
@@ -1542,5 +1542,73 @@
 
 		rmdir($directory);
 	}
+
+	/**
+	 * Data provider for checkIsFirstPartOfStrReturnsTrueForMatchingFirstParts
+	 *
+	 * @return array
+	 */
+	public function matchingFirstPartsDataProvider() {
+		return array(
+			'hello world/hello' => array('hello world', 'hello'),
+			'hello/hello' => array('hello', 'hello'),
+			'null/zero' => array(NULL, 0),
+		);
+	}
+
+	/**
+	 * Checks if t3lib_div::isFirstPartOfStr returns true for a set of matching
+	 * string/firstParts.
+	 *
+	 * @test
+	 * @see t3lib_div::isFirstPartOfStr
+	 * @dataProvider matchingFirstPartsDataProvider
+	 */
+	public function checkIsFirstPartOfStrReturnsTrueForMatchingFirstParts($str, $partStr) {
+		$this->assertTrue(t3lib_div::isFirstPartOfStr($str, $partStr));
+	}
+
+	/**
+	 * Checks if t3lib_div::isFirstPartOfStr returns false for a not matching
+	 * pair of string and firstPart.
+	 *
+	 * @test
+	 * @see t3lib_div::isFirstPartOfStr
+	 */
+	public function checkIsFirstPartOfStrReturnsFlalseForForNotMatchingFirstPart() {
+		$this->assertFalse(t3lib_div::isFirstPartOfStr('hello world', 'ello'));
+	}
+
+	/**
+	 * Checks if t3lib_div::isFirstPartOfStr returns false for special case
+	 * empty string pair.
+	 *
+	 * @test
+	 * @see t3lib_div::isFirstPartOfStr
+	 */
+	public function checkIsFirstPartOfStrReturnsFalseForEmptyStrings($str, $partStr) {
+		$this->assertFalse(t3lib_div::isFirstPartOfStr('', ''));
+	}
+
+	/**
+	 * Checks if t3lib_div::isFirstPartOfStr returns false for special case
+	 * null/null.
+	 *
+	 * @test
+	 * @see t3lib_div::isFirstPartOfStr
+	 */
+	public function checkIsFirstPartOfStrReturnsFalseForNullAndNull($str, $partStr) {
+		$this->assertFalse(t3lib_div::isFirstPartOfStr(NULL, NULL));
+	}
+
+	/**
+	 * Checks if t3lib_div::isFirstPartOfStr works case sensitive.
+	 *
+	 * @test
+	 * @see t3lib_div::isFirstPartOfStr
+	 */
+	public function checkIsFirstPartOfStrWorksCaseSensitive($str, $partStr) {
+		$this->assertFalse(t3lib_div::isFirstPartOfStr('hello world', 'Hello'));
+	}
 }
 ?>
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