public function testGetAddress()
 {
     $account = Account::reference('ACCOUNT_ID');
     $response = $this->getMock(ResponseInterface::class);
     $expected = new Address();
     $this->http->expects($this->any())->method('get')->with('/v2/accounts/ACCOUNT_ID/addresses/ADDRESS_ID', ['foo' => 'bar'])->willReturn($response);
     $this->mapper->expects($this->any())->method('toAddress')->with($response)->willReturn($expected);
     $actual = $this->client->getAccountAddress($account, 'ADDRESS_ID', ['foo' => 'bar']);
     $this->assertSame($expected, $actual);
 }