rename str.php to str.test.php... change suffix in phpunit.xml

phpunit.xml

 <phpunit colors="false" bootstrap="phpunit.php">
 	<testsuites>
 		<testsuite name="Test Suite">
-			<directory suffix=".php">tests/cases</directory>
+			<directory suffix=".test.php">tests/cases</directory>
 		</testsuite>
 	</testsuites>
 </phpunit>
\ No newline at end of file

tests/cases/laravel/str.php

-<?php
-
-class StrTest extends PHPUnit_Framework_TestCase {
-
-	/**
-	 * Test the Str::encoding method.
-	 *
-	 * @group laravel
-	 */
-	public function testEncodingShouldReturnApplicationEncoding()
-	{
-		$this->assertEquals('UTF-8', Config::get('application.encoding'));
-	}
-
-}
\ No newline at end of file