diff --git a/src/Pluf/Cache/File.php b/src/Pluf/Cache/File.php
index d06b0ad..78213e0 100644
--- a/src/Pluf/Cache/File.php
+++ b/src/Pluf/Cache/File.php
@@ -51,7 +51,8 @@ class Pluf_Cache_File extends Pluf_Cache
         if ($timeout == null) $timeout = Pluf::f('cache_timeout', 300);
         if (!file_exists($dir)) mkdir($dir, 0777, true);
         $expire = time()+$timeout;
-        file_put_contents($fname, $expire."\n".serialize($value), LOCK_EX);
+        $success = file_put_contents($fname, $expire."\n".serialize($value), LOCK_EX);
+        return (false === $success) ? false : true;
     }
 
     /**
diff --git a/src/Pluf/Tests/Cache/Apc.php b/src/Pluf/Tests/Cache/Apc.php
new file mode 100644
index 0000000..1e5c51c
--- /dev/null
+++ b/src/Pluf/Tests/Cache/Apc.php
@@ -0,0 +1,99 @@
+<?php
+/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+# ***** BEGIN LICENSE BLOCK *****
+# This file is part of Plume Framework, a simple PHP Application Framework.
+# Copyright (C) 2001-2007 Loic d'Anterroches and contributors.
+#
+# Plume Framework is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# Plume Framework is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+# ***** END LICENSE BLOCK ***** */
+
+class Pluf_Tests_Cache_Apc extends UnitTestCase {
+
+    private $_config;
+
+    private $_arrayData = array(
+        'hello' => 'world',
+        'foo'   => false,
+        0 => array('foo', 'bar')
+    );
+
+    public function __construct()
+    {
+        parent::__construct('Test the APC cache API.');
+    }
+
+    public function setUp()
+    {
+        $this->_config = $GLOBALS['_PX_config']; // backup
+        $GLOBALS['_PX_config']['cache_engine']  = 'Pluf_Cache_Apc';
+        $GLOBALS['_PX_config']['cache_timeout'] = 5;
+        $GLOBALS['_PX_config']['cache_apc_keyprefix'] = 'pluf_unittest_';
+    }
+
+    public function tearDown()
+    {
+        $GLOBALS['_PX_config'] = $this->_config;
+    }
+
+    public function testBasic()
+    {
+        $cache = Pluf_Cache::factory();
+        $success = $cache->set('test1', 'foo1');
+        $this->assertTrue($success);
+        $this->assertEqual('foo1', $cache->get('test1'));
+    }
+
+    public function testGetUnknownKey()
+    {
+        $cache = Pluf_Cache::factory();
+        $this->assertNull(null, $cache->get('unknown'));
+    }
+
+    public function testGetDefault()
+    {
+        $cache = Pluf_Cache::factory();
+        $this->assertEqual('default', $cache->get('unknown', 'default'));
+    }
+
+    public function testSerialized()
+    {
+        $cache = Pluf_Cache::factory();
+        $success = $cache->set('array', $this->_arrayData);
+        $this->assertTrue($success);
+        $this->assertCopy($this->_arrayData, $cache->get('array'));
+
+        $obj = new stdClass();
+        $obj->foo = 'bar';
+        $obj->hello = 'world';
+        $success = $cache->set('object', $obj);
+        $this->assertTrue($success);
+        $this->assertCopy($obj, $cache->get('object'));
+
+        unset($obj);
+        $this->assertIsA($cache->get('object'), 'stdClass');
+        $this->assertEqual('world', $cache->get('object')->hello);
+    }
+
+    public function testCompress()
+    {
+        $GLOBALS['_PX_config']['cache_apc_compress'] = true;
+        $cache = Pluf_Cache::factory();
+        $success = $cache->set('compressed', $this->_arrayData);
+        $this->assertTrue($success);
+        $this->assertCopy($this->_arrayData, $cache->get('compressed'));
+    }
+}
diff --git a/src/Pluf/Tests/Cache/File.php b/src/Pluf/Tests/Cache/File.php
new file mode 100644
index 0000000..85a252b
--- /dev/null
+++ b/src/Pluf/Tests/Cache/File.php
@@ -0,0 +1,102 @@
+<?php
+/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+# ***** BEGIN LICENSE BLOCK *****
+# This file is part of Plume Framework, a simple PHP Application Framework.
+# Copyright (C) 2001-2007 Loic d'Anterroches and contributors.
+#
+# Plume Framework is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# Plume Framework is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+# ***** END LICENSE BLOCK ***** */
+
+class Pluf_Tests_Cache_File extends UnitTestCase {
+
+    private $_config;
+
+    private $_arrayData = array(
+        'hello' => 'world',
+        'foo'   => false,
+        0 => array('foo', 'bar')
+    );
+
+    public function __construct()
+    {
+        parent::__construct('Test the File cache API.');
+    }
+
+    public function setUp()
+    {
+        $this->_config = $GLOBALS['_PX_config']; // backup
+        $GLOBALS['_PX_config']['cache_engine']  = 'Pluf_Cache_File';
+        $GLOBALS['_PX_config']['cache_timeout'] = 5;
+        $GLOBALS['_PX_config']['cache_file_folder'] = '/tmp/pluf_unittest_cache';
+    }
+
+    public function tearDown()
+    {
+        $GLOBALS['_PX_config'] = $this->_config;
+    }
+
+    public function testConstructor()
+    {
+        unset($GLOBALS['_PX_config']['cache_file_folder']);
+        try {
+            $cache = Pluf_Cache::factory();
+        } catch (Pluf_Exception_SettingError $e) {
+            $this->pass();
+            return;
+        }
+        $this->fail('An exception as not been raised, "cache_file_folder" setting not defined.');
+    }
+
+    public function testBasic()
+    {
+        $cache = Pluf_Cache::factory();
+        $success = $cache->set('test1', 'foo1');
+        $this->assertTrue($success);
+        $this->assertEqual('foo1', $cache->get('test1'));
+    }
+
+    public function testGetUnknownKey()
+    {
+        $cache = Pluf_Cache::factory();
+        $this->assertNull(null, $cache->get('unknown'));
+    }
+
+    public function testGetDefault()
+    {
+        $cache = Pluf_Cache::factory();
+        $this->assertEqual('default', $cache->get('unknown', 'default'));
+    }
+
+    public function testSerialized()
+    {
+        $cache = Pluf_Cache::factory();
+        $success = $cache->set('array', $this->_arrayData);
+        $this->assertTrue($success);
+        $this->assertCopy($this->_arrayData, $cache->get('array'));
+
+        $obj = new stdClass();
+        $obj->foo = 'bar';
+        $obj->hello = 'world';
+        $success = $cache->set('object', $obj);
+        $this->assertTrue($success);
+        $this->assertCopy($obj, $cache->get('object'));
+
+        unset($obj);
+        $this->assertIsA($cache->get('object'), 'stdClass');
+        $this->assertEqual('world', $cache->get('object')->hello);
+    }
+}