public function testUploadsData()
{
$requestWrapper = $this->prophesize('Google\\Cloud\\RequestWrapper');
$stream = Psr7\stream_for('abcd');
$successBody = '{"canI":"kickIt"}';
$response = new Response(200, [], $successBody);
$requestWrapper->send(Argument::type('Psr\\Http\\Message\\RequestInterface'), Argument::type('array'))->willReturn($response);
$uploader = new MultipartUploader($requestWrapper->reveal(), $stream, 'http://www.example.com');
$this->assertEquals(json_decode($successBody, true), $uploader->upload());
}