Add missing test file

tests/CacheKit/FileSystemCacheTest.php

@@ -0,0 +1,50 @@
+<?php
+
+class FileSystemCacheTest extends PHPUnit_Framework_TestCase
+{
+
+    function testSerializer()
+    {
+        $serializer = new SerializerKit\Serializer('json');
+        $cache = new CacheKit\FileSystemCache(array( 
+            'expiry' => 30,
+            'cache_dir' => 'cache',
+            'serializer' => $serializer,
+        ));
+        $cache->clear();
+
+        $url = 'foo_bar';
+        $html = 'test content';
+        $cache->set( $url , $html );
+        $html2 = $cache->get( $url );
+
+        is( $html , $html2 );
+
+        $cache->remove( $url );
+
+        ok( null === $cache->get( $url ) );
+
+        $cache->clear();
+
+        ok( null === $cache->get( $url ) );
+    }
+
+    function test()
+    {
+        $cache = new CacheKit\FileSystemCache(array( 
+            'expiry' => 30,
+            'cache_dir' => 'cache',
+        ));
+
+        $url = 'http://google.com';
+        $cache->set( $url , $html = file_get_contents($url) );
+        $html2 = $cache->get( $url );
+
+        is( $html , $html2 );
+        $cache->remove( $url );
+        ok( null === $cache->get( $url ) );
+
+        $cache->clear();
+    }
+}
+