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‎labs/lab-4/src/test/java/pragmatech/digital/workshops/lab4/experiment/SampleIT.java‎

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import com.github.tomakehurst.wiremock.WireMockServer;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.resttestclient.autoconfigure.AutoConfigureRestTestClient;
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import org.springframework.boot.resttestclient.autoconfigure.AutoConfigureTestRestTemplate;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.boot.test.web.server.LocalServerPort;
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import org.springframework.boot.testcontainers.service.connection.ServiceConnection;
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import org.springframework.boot.webmvc.test.autoconfigure.AutoConfigureMockMvc;
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import org.springframework.boot.webtestclient.autoconfigure.AutoConfigureWebTestClient;
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import org.springframework.test.context.ContextConfiguration;
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import org.springframework.test.web.reactive.server.WebTestClient;
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import org.springframework.test.web.servlet.MockMvc;
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import org.testcontainers.containers.PostgreSQLContainer;
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import org.testcontainers.junit.jupiter.Container;
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import org.testcontainers.junit.jupiter.Testcontainers;
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import pragmatech.digital.workshops.lab4.config.OpenLibraryApiStub;
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import pragmatech.digital.workshops.lab4.config.WireMockContextInitializer;
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@Testcontainers
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@SpringBootTest
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@ContextConfiguration(initializers = WireMockContextInitializer.class)
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@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
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@AutoConfigureWebTestClient
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@AutoConfigureTestRestTemplate
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@AutoConfigureRestTestClient
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class SampleIT {
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@Container
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@ServiceConnection
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static final PostgreSQLContainer<?> postgresContainer = new PostgreSQLContainer<>("postgres:16-alpine")
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.withDatabaseName("testdb")
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.withUsername("test")
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.withPassword("test");
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@LocalServerPort
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private int port;
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@Autowired
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private WireMockServer wireMockServer;
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@Autowired
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private OpenLibraryApiStub openLibraryApiStub;
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private WebTestClient webTestClient;
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@Test
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void sampleTest() {
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this.webTestClient.get().uri("/api/books").exchangeSuccessfully();
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}
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}

‎slides/assets/lab-4-mock-variant.excalidraw‎

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{
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"type": "excalidraw",
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"version": 2,
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"source": "mcp-excalidraw-server",
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"strokeColor": "#1e1e1e",
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"text": "@SpringBootTest (MOCK) — Single Thread, No Real Server",
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"fontSize": 20,
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"createdAt": "2026-02-28T15:10:43.522Z",
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"updatedAt": "2026-02-28T15:10:43.522Z",
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"x": 80,
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"width": 200,
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"strokeColor": "#868e96",
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"text": "JVM — Single Thread",
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"createdAt": "2026-02-28T15:10:43.522Z",
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"updatedAt": "2026-02-28T15:10:43.522Z",
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"version": 1
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},
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{
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"id": "box-test",
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"type": "rectangle",
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"backgroundColor": "#a5d8ff",
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"label": {
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"text": "Test Class\n@SpringBootTest"
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"strokeWidth": 2,
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"label": {
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"text": "MockMvc.perform()\npost(\"/api/books\")"
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},
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"fontSize": 15,
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"createdAt": "2026-02-28T15:10:43.522Z",
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"updatedAt": "2026-02-28T15:10:43.522Z",
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"version": 1
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{
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"id": "box-dispatcher",
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"backgroundColor": "#b2f2bb",
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"strokeColor": "#2f9e44",
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"strokeWidth": 2,
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"label": {
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"text": "DispatcherServlet"
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},
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"updatedAt": "2026-02-28T15:10:43.522Z",
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"version": 1
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{
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"backgroundColor": "#b2f2bb",
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"strokeColor": "#2f9e44",
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"strokeWidth": 2,
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"label": {
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"text": "Controller → Service\n→ Repository"
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},
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"fontSize": 15,
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"createdAt": "2026-02-28T15:10:43.522Z",
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"updatedAt": "2026-02-28T15:10:43.522Z",
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"version": 1
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},
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{
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"id": "arrow-test-mockmvc",
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"type": "arrow",
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[
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"createdAt": "2026-02-28T15:10:43.523Z",
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"updatedAt": "2026-02-28T15:10:43.523Z",
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"version": 1,
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"startBinding": {
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"elementId": "box-test",
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"focus": 0,
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},
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"endBinding": {
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"elementId": "box-mockmvc",
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"focus": 0,
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}
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{
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"id": "arrow-mockmvc-dispatcher",
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"width": 0,
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"height": 60,
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"strokeColor": "#1971c2",
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"label": {
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"text": "same thread\nno network"
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[
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"version": 1,
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},
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"endBinding": {
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"focus": 0,
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}
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{
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"id": "arrow-dispatcher-ctrl",
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"type": "arrow",
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"version": 1,
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"startBinding": {
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"elementId": "box-dispatcher",
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"text": "Spring MVC infrastructure — REAL ✅",
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"text": "• @RequestMapping routing\n• Security filter chain\n• Bean Validation (@Valid)\n• @ControllerAdvice handlers\n• Servlet filters",
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"text": "NOT real ❌\nTCP stack · Tomcat thread pool\nHTTP connection management",
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"text": "@Transactional on test → wraps full call chain → auto-rollback ✅",
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