Upgrade tests to Junit5

See gh-14737

spring-boot-samples/spring-boot-sample-secure/src/test/java/sample/secure/SampleSecureApplicationTests.java

@@ -16,10 +16,9 @@
 
 package sample.secure;
 
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
@@ -28,16 +27,16 @@ import org.springframework.security.authentication.UsernamePasswordAuthenticatio
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.AuthenticationException;
 import org.springframework.security.core.context.SecurityContextHolder;
-import org.springframework.test.context.junit4.SpringRunner;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 
 /**
  * Basic integration tests for demo application.
  *
  * @author Dave Syer
  */
-@RunWith(SpringRunner.class)
+
 @SpringBootTest(classes = { SampleSecureApplication.class })
 public class SampleSecureApplicationTests {
 
@@ -46,19 +45,20 @@ public class SampleSecureApplicationTests {
 
 	private Authentication authentication;
 
-	@Before
+	@BeforeEach
 	public void init() {
 		this.authentication = new UsernamePasswordAuthenticationToken("user", "password");
 	}
 
-	@After
+	@AfterEach
 	public void close() {
 		SecurityContextHolder.clearContext();
 	}
 
-	@Test(expected = AuthenticationException.class)
+	@Test
 	public void secure() {
-		assertThat("Hello Security").isEqualTo(this.service.secure());
+		assertThatExceptionOfType(AuthenticationException.class)
+				.isThrownBy(() -> SampleSecureApplicationTests.this.service.secure());
 	}
 
 	@Test
@@ -73,10 +73,11 @@ public class SampleSecureApplicationTests {
 		assertThat("Hello World").isEqualTo(this.service.authorized());
 	}
 
-	@Test(expected = AccessDeniedException.class)
+	@Test
 	public void denied() {
 		SecurityContextHolder.getContext().setAuthentication(this.authentication);
-		assertThat("Goodbye World").isEqualTo(this.service.denied());
+		assertThatExceptionOfType(AccessDeniedException.class)
+				.isThrownBy(() -> SampleSecureApplicationTests.this.service.denied());
 	}
 
 }