add tests for blogpost initialization

src/test/java/de/sample/schulung/spring/blog/boundary/BlogPostControllerTests.java

@@ -3,6 +3,8 @@
 import de.sample.schulung.spring.blog.domain.BlogPostService;
 import org.junit.jupiter.api.Test;
 import org.mapstruct.factory.Mappers;
+import org.mockito.Mockito;
+import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.http.HttpStatus;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -11,7 +13,8 @@ public class BlogPostControllerTests {
 
   @Test
   void shouldCreateBlogPostSuccessfully() {
-    final var service = new BlogPostService();
+    final var eventPublisher = Mockito.mock(ApplicationEventPublisher.class);
+    final var service = new BlogPostService(eventPublisher);
     final var mapper = Mappers.getMapper(BlogPostDtoMapper.class);
     final var controller = new BlogPostController(service, mapper);
     final var blogPost = new BlogPostDto();
@@ -27,6 +30,8 @@ void shouldCreateBlogPostSuccessfully() {
     assertThat(result.getBody().getTitle())
       .isEqualTo(blogPost.getTitle());
 
+    // TODO verify eventPublisher.publishEvent?
+
   }
 
 }

src/test/java/de/sample/schulung/spring/blog/domain/BlogPostEventsTests.java

@@ -0,0 +1,50 @@
+package de.sample.schulung.spring.blog.domain;
+
+import jakarta.validation.ConstraintViolationException;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.event.ApplicationEvents;
+import org.springframework.test.context.event.RecordApplicationEvents;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+@SpringBootTest
+@RecordApplicationEvents
+public class BlogPostEventsTests {
+
+  @Autowired
+  BlogPostService service;
+  @SuppressWarnings("SpringJavaInjectionPointsAutowiringInspection")
+  @Autowired
+  ApplicationEvents events;
+
+  @Test
+  void shouldPublishEventOnCreate() {
+    final var newBlogPost = BlogPost
+      .builder()
+      .title("test")
+      .content("test content with 10 chars")
+      .build();
+    service.create(newBlogPost);
+
+    assertThat(events.stream(BlogPostCreatedEvent.class))
+      .hasSize(1)
+      .first()
+      .extracting(BlogPostCreatedEvent::blogPost)
+      .isSameAs(newBlogPost);
+  }
+
+  @Test
+  void shouldNotPublishEventOnInvalidCreate() {
+    final var newBlogPost = BlogPost
+      .builder()
+      .content("test content with 10 chars")
+      .build();
+    assertThatThrownBy(() -> service.create(newBlogPost))
+      .isInstanceOf(ConstraintViolationException.class);
+    assertThat(events.stream(BlogPostCreatedEvent.class))
+      .isEmpty();
+  }
+}