--- a/spring-boot-playground/pom.xml	Thu Aug 13 15:31:38 2020 +0200
+++ b/spring-boot-playground/pom.xml	Thu Aug 13 15:58:57 2020 +0200
@@ -60,14 +60,18 @@
 					<groupId>org.junit.vintage</groupId>
 					<artifactId>junit-vintage-engine</artifactId>
 				</exclusion>
+				<exclusion>
+					<groupId>junit</groupId>
+					<artifactId>junit</artifactId>
+				</exclusion>
 			</exclusions>
 		</dependency>
-<!-- 		<dependency> -->
-<!-- 			<groupId>org.junit.jupiter</groupId> -->
-<!-- 			<artifactId>junit-jupiter</artifactId> -->
-<!-- 			<version>5.6.2</version> -->
-<!-- 			<scope>test</scope> -->
-<!-- 		</dependency> -->
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter</artifactId>
+			<version>5.6.2</version>
+			<scope>test</scope>
+		</dependency>
 		<dependency>
 			<groupId>org.hamcrest</groupId>
 			<artifactId>hamcrest</artifactId>

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spring-boot-playground/src/test/java/de/comline/spring/service/MovieServiceTest.java	Thu Aug 13 15:58:57 2020 +0200
@@ -0,0 +1,48 @@
+package de.comline.spring.service;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import  static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import de.comline.spring.entity.Movie;
+import de.comline.spring.repository.MovieRepository;
+import de.comline.spring.service.MovieServiceTest.TestConfig;
+
+@SpringBootTest(classes = {
+	MovieService.class,
+	TestConfig.class
+})
+public class MovieServiceTest {
+	@Autowired
+	private MovieService service;
+	
+	@Test
+	@DisplayName("Test with a mock movie repository")
+	void withMockRepository() {
+		String title = "the-movie-title";
+		
+		Movie movie = service.createMovie(title);
+		assertThat(movie.getTitle(), is(title));
+	}
+	
+	@Configuration
+	static class TestConfig {
+		@Bean
+		MovieRepository createMockRepository() {
+			MovieRepository mockRepository = mock(MovieRepository.class);
+			when(mockRepository.save(any())).thenAnswer(invocation -> {
+				return invocation.getArgument(0);
+			});
+			return mockRepository;
+		}
+	}
+}