port MinifyCacheAPCTest to phpunit

tests/MinifyCacheAPCTest.php

@@ -0,0 +1,21 @@
+<?php
+
+class MinifyCacheAPCTest extends TestCase
+{
+    public function setUp()
+    {
+        if (!function_exists('apc_store')) {
+            // FIXME: is APCu extension ok too?
+            $this->markTestSkipped("To test this component, install APC extension");
+        }
+    }
+
+    public function test1()
+    {
+        $data = str_repeat(md5(time()) . 'í', 100); // 3400 bytes in UTF-8
+        $id = 'Minify_test_cache';
+
+        $cache = new Minify_Cache_APC();
+        $this->assertTestCache($cache, $id, $data);
+    }
+}