public function testWriteWithHeaders()
{
$container = $this->getContainerMock();
$dataObject = $this->getDataObjectMock('filename.ext');
$headers = ['custom' => 'headers'];
$container->shouldReceive('uploadObject')->with('filename.ext', 'content', $headers)->andReturn($dataObject);
$adapter = new Rackspace($container);
$config = new Config(['headers' => $headers]);
$this->assertInternalType('array', $adapter->write('filename.ext', 'content', $config));
}
