public function testCreateTransaction() { $account = Account::reference('ACCOUNT_ID'); $transaction = new Transaction(); $response = $this->getMock(ResponseInterface::class); $this->mapper->expects($this->any())->method('fromTransaction')->with($transaction)->willReturn(['key' => 'value']); $this->http->expects($this->once())->method('post')->with('/v2/accounts/ACCOUNT_ID/transactions', ['key' => 'value', 'foo' => 'bar'])->willReturn($response); $this->mapper->expects($this->once())->method('toTransaction')->with($response, $transaction); $this->client->createAccountTransaction($account, $transaction, ['foo' => 'bar']); }