Add casetitle function

tests/StaticStringyTest.php

@@ -244,6 +244,16 @@ class StaticStringyTestCase extends CommonTest
         $this->assertEquals($expected, $result);
     }
 
+    /**
+     * @dataProvider toCaseTitleProvider()
+     */
+    public function testToCaseTitle($expected, $str, $encoding = null)
+    {
+        $result = S::toCaseTitle($str, $encoding);
+        $this->assertInternalType('string', $result);
+        $this->assertEquals($expected, $result);
+    }
+
     /**
      * @dataProvider toUpperCaseProvider()
      */