diff --git a/tests/codeigniter/helpers/string_helper_test.php b/tests/codeigniter/helpers/string_helper_test.php
index 5e0ee45..2d7f96a 100644
--- a/tests/codeigniter/helpers/string_helper_test.php
+++ b/tests/codeigniter/helpers/string_helper_test.php
@@ -10,14 +10,14 @@
 			'//Slashes//\/'	=> 'Slashes//\\',
 			'/var/www/html/'	=> 'var/www/html'
 		);
-		
+
 		foreach ($strs as $str => $expect)
 		{
 			$this->assertEquals($expect, trim_slashes($str));
 		}
 	}
-	
-	// --------------------------------------------------------------------	
+
+	// --------------------------------------------------------------------
 
 	public function test_strip_quotes()
 	{
@@ -25,30 +25,30 @@
 			'"me oh my!"'		=> 'me oh my!',
 			"it's a winner!"	=> 'its a winner!',
 		);
-		
+
 		foreach ($strs as $str => $expect)
 		{
 			$this->assertEquals($expect, strip_quotes($str));
 		}
 	}
 
-	// --------------------------------------------------------------------	
-	
+	// --------------------------------------------------------------------
+
 	public function test_quotes_to_entities()
 	{
 		$strs = array(
 			'"me oh my!"'		=> '&quot;me oh my!&quot;',
 			"it's a winner!"	=> 'it&#39;s a winner!',
 		);
-		
+
 		foreach ($strs as $str => $expect)
 		{
 			$this->assertEquals($expect, quotes_to_entities($str));
-		}		
+		}
 	}
 
-	// --------------------------------------------------------------------	
-	
+	// --------------------------------------------------------------------
+
 	public function test_reduce_double_slashes()
 	{
 		$strs = array(
@@ -56,57 +56,56 @@
 			'//var/www/html/example.com/'	=> '/var/www/html/example.com/',
 			'/var/www/html//index.php'		=> '/var/www/html/index.php'
 		);
-		
+
 		foreach ($strs as $str => $expect)
 		{
 			$this->assertEquals($expect, reduce_double_slashes($str));
-		}		
+		}
 	}
 
-	// --------------------------------------------------------------------	
-	
+	// --------------------------------------------------------------------
+
 	public function test_reduce_multiples()
 	{
 		$strs = array(
 			'Fred, Bill,, Joe, Jimmy'	=> 'Fred, Bill, Joe, Jimmy',
 			'Ringo, John, Paul,,'		=> 'Ringo, John, Paul,'
 		);
-		
+
 		foreach ($strs as $str => $expect)
 		{
 			$this->assertEquals($expect, reduce_multiples($str));
 		}
-		
+
 		$strs = array(
 			'Fred, Bill,, Joe, Jimmy'	=> 'Fred, Bill, Joe, Jimmy',
 			'Ringo, John, Paul,,'		=> 'Ringo, John, Paul'
-		);		
+		);
 
 		foreach ($strs as $str => $expect)
 		{
 			$this->assertEquals($expect, reduce_multiples($str, ',', TRUE));
-		}		
+		}
 	}
-	
-	// --------------------------------------------------------------------	
-	
+
+	// --------------------------------------------------------------------
+
 	public function test_repeater()
 	{
 		$strs = array(
 			'a'			=> 'aaaaaaaaaa',
 			'&nbsp;'	=> '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;',
 			'<br>'		=> '<br><br><br><br><br><br><br><br><br><br>'
-			
+
 		);
-		
+
 		foreach ($strs as $str => $expect)
 		{
 			$this->assertEquals($expect, repeater($str, 10));
 		}
-	}	
+	}
 
-	// --------------------------------------------------------------------	
-
+	// --------------------------------------------------------------------
 
 	public function test_random_string()
 	{
@@ -114,5 +113,17 @@
 		$this->assertEquals(32, strlen(random_string('unique', 16)));
 		$this->assertInternalType('string', random_string('numeric', 16));
 	}
-	
+
+	// --------------------------------------------------------------------
+
+	public function test_increment_string()
+	{
+		$this->assertEquals('my-test_1', increment_string('my-test'));
+		$this->assertEquals('my-test-1', increment_string('my-test', '-'));
+		$this->assertEquals('file_5', increment_string('file_4'));
+		$this->assertEquals('file-5', increment_string('file-4', '-'));
+		$this->assertEquals('file-5', increment_string('file-4', '-'));
+		$this->assertEquals('file-1', increment_string('file', '-', '1'));
+		$this->assertEquals(124, increment_string('123', ''));
+	}
 }
\ No newline at end of file