TFileCacheDependency performs dependency checking based on the
last modification time of the file specified via {@link setFileName FileName}.
The dependency is reported as unchanged if and only if the file's
last modification time remains unchanged.
public function testFileName()
{
$dependency = new TFileCacheDependency(__FILE__);
$this->assertEquals($dependency->getFileName(), __FILE__);
$this->assertEquals($dependency->getTimestamp(), filemtime(__FILE__));
$dependency = new TFileCacheDependency(dirname(__FILE__) . '/foo.txt');
$this->assertFalse($dependency->getTimestamp());
}
