Testcontainers와 WireMock은 무엇을 진짜로 바꿔줄까요?

package com.example.order;

import static org.assertj.core.api.Assertions.assertThat;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.testcontainers.service.connection.ServiceConnection;
import org.testcontainers.containers.PostgreSQLContainer;
import org.testcontainers.junit.jupiter.Container;
import org.testcontainers.junit.jupiter.Testcontainers;

@Testcontainers
@SpringBootTest
class OrderRepositoryIntegrationTests {

    @Container
    @ServiceConnection
    static final PostgreSQLContainer<?> postgres =
            new PostgreSQLContainer<>("postgres:17-alpine");

    @Autowired
    private OrderRepository orders;

    @Test
    void savesAndReadsAnOrderWithPostgreSql() {
        Order saved = this.orders.save(Order.pending("ORD-1001"));

        Order found = this.orders.findById(saved.id()).orElseThrow();

        assertThat(found.orderNumber()).isEqualTo("ORD-1001");
    }
}

package com.example.order;

import static com.github.tomakehurst.wiremock.client.WireMock.equalToJson;
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.serverError;
import static com.github.tomakehurst.wiremock.client.WireMock.urlEqualTo;
import static com.github.tomakehurst.wiremock.client.WireMock.verify;
import static org.assertj.core.api.Assertions.assertThatThrownBy;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.wiremock.spring.ConfigureWireMock;
import org.wiremock.spring.EnableWireMock;

@SpringBootTest
@EnableWireMock(@ConfigureWireMock(baseUrlProperties = "shipping.base-url"))
class ShippingClientIntegrationTests {

    @Autowired
    private ShippingClient shippingClient;

    @Test
    void translatesAProviderFailureWithoutSilentlyRetryingForever() {
        com.github.tomakehurst.wiremock.client.WireMock.stubFor(
                post("/rates").willReturn(serverError()));

        assertThatThrownBy(() -> this.shippingClient.quote("10001", 1200))
                .isInstanceOf(ShippingUnavailableException.class);

        verify(1, postRequestedFor(urlEqualTo("/rates"))
                .withRequestBody(equalToJson("""
                        {"postalCode":"10001","weightGrams":1200}
                        """)));
    }
}