BankSimulatorContractTest.java

package com.checkout.payment.gateway.client;

import static com.github.tomakehurst.wiremock.client.WireMock.aResponse;
import static com.github.tomakehurst.wiremock.client.WireMock.equalTo;
import static com.github.tomakehurst.wiremock.client.WireMock.matchingJsonPath;
import static com.github.tomakehurst.wiremock.client.WireMock.post;
import static com.github.tomakehurst.wiremock.client.WireMock.postRequestedFor;
import static com.github.tomakehurst.wiremock.client.WireMock.urlEqualTo;
import static org.assertj.core.api.Assertions.assertThat;

import com.checkout.payment.gateway.model.BankRequest;
import com.checkout.payment.gateway.model.BankResponse;
import com.github.tomakehurst.wiremock.WireMockServer;
import com.github.tomakehurst.wiremock.core.WireMockConfiguration;
import java.time.Duration;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.web.client.RestTemplate;

class BankSimulatorContractTest {

    private static WireMockServer wireMockServer;

    @BeforeAll
    static void startServer() {
        wireMockServer = new WireMockServer(WireMockConfiguration.options().dynamicPort());
        wireMockServer.start();
    }

    @AfterAll
    static void stopServer() {
        wireMockServer.stop();
    }

    @Test
    void bankRequestMatchesSimulatorContract() {
        wireMockServer.stubFor(post(urlEqualTo("/payments"))
                .willReturn(aResponse()
                        .withStatus(200)
                        .withHeader("Content-Type", "application/json")
                        .withBody("{\"authorized\":true,\"authorization_code\":\"test-auth-code\"}")));

        RestTemplate restTemplate = new RestTemplateBuilder()
                .setConnectTimeout(Duration.ofSeconds(2))
                .setReadTimeout(Duration.ofSeconds(2))
                .build();

        String baseUrl = "http://localhost:" + wireMockServer.port();
        BankClient client = new BankClient(restTemplate, baseUrl);

        BankRequest request = new BankRequest("2222405343248877", 4, 2030, "GBP", 100, "123");
        BankResponse response = client.processPayment(request);

        assertThat(response.isAuthorized()).isTrue();
        assertThat(response.getAuthorizationCode()).isEqualTo("test-auth-code");

        wireMockServer.verify(postRequestedFor(urlEqualTo("/payments"))
                .withRequestBody(matchingJsonPath("$.card_number", equalTo("2222405343248877")))
                .withRequestBody(matchingJsonPath("$.expiry_date", equalTo("04/2030")))
                .withRequestBody(matchingJsonPath("$.currency", equalTo("GBP")))
                .withRequestBody(matchingJsonPath("$.amount", equalTo("100")))
                .withRequestBody(matchingJsonPath("$.cvv", equalTo("123"))));
    }
}