public function testCreateSell()
{
$account = Account::reference('ACCOUNT_ID');
$sell = new Sell();
$response = $this->getMock(ResponseInterface::class);
$this->mapper->expects($this->any())->method('fromSell')->with($sell)->willReturn(['key' => 'value']);
$this->http->expects($this->once())->method('post')->with('/v2/accounts/ACCOUNT_ID/sells', ['key' => 'value', 'foo' => 'bar'])->willReturn($response);
$this->mapper->expects($this->once())->method('toSell')->with($response, $sell);
$this->client->createAccountSell($account, $sell, ['foo' => 'bar']);
}