/**
* Empty strings or anything that is not a string is ignored without error
*
* @dataProvider provideInvalidStrings
* @depends testAddFileGetFiles
* @return null
*/
public function testAddFilesInvalidFiles($file)
{
$this->assertSame($this->dependency, $this->dependency->addFile($file), 'uses a fluent interface');
$this->assertEquals(array(), $this->dependency->getFiles());
}