PoC: migrate from JUnit 4 to JUnit Jupiter Assertions

Author: sbrannen

spring-test/src/test/java/org/springframework/test/web/reactive/server/HeaderAssertionTests.java

@@ -22,6 +22,8 @@
 import java.util.concurrent.TimeUnit;
 
 import org.junit.Test;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.function.Executable;
 import reactor.core.publisher.MonoProcessor;
 
 import org.springframework.http.CacheControl;
@@ -33,7 +35,7 @@
 import org.springframework.mock.http.client.reactive.MockClientHttpResponse;
 
 import static org.hamcrest.CoreMatchers.*;
-import static org.junit.Assert.*;
+import static org.junit.jupiter.api.Assertions.*;
 import static org.mockito.Mockito.*;
 
 /**
@@ -51,32 +53,11 @@ public void valueEquals() {
 		headers.add("foo", "bar");
 		HeaderAssertions assertions = headerAssertions(headers);
 
-		// Success
-		assertions.valueEquals("foo", "bar");
-
-		try {
-			assertions.valueEquals("what?!", "bar");
-			fail("Missing header expected");
-		}
-		catch (AssertionError error) {
-			// expected
-		}
+		assertDoesNotThrow(() -> assertions.valueEquals("foo", "bar"));
 
-		try {
-			assertions.valueEquals("foo", "what?!");
-			fail("Wrong value expected");
-		}
-		catch (AssertionError error) {
-			// expected
-		}
-
-		try {
-			assertions.valueEquals("foo", "bar", "what?!");
-			fail("Wrong # of values expected");
-		}
-		catch (AssertionError error) {
-			// expected
-		}
+		assertThrows(() -> assertions.valueEquals("what?!", "bar"), "Missing header expected");
+		assertThrows(() -> assertions.valueEquals("foo", "what?!"), "Wrong value expected");
+		assertThrows(() -> assertions.valueEquals("foo", "bar", "what?!"), "Wrong # of values expected");
 	}
 
 	@Test
@@ -104,7 +85,6 @@ public void valueEqualsWithMultipeValues() {
 		catch (AssertionError error) {
 			// expected
 		}
-
 	}
 
 	@Test
@@ -263,4 +243,8 @@ private HeaderAssertions headerAssertions(HttpHeaders responseHeaders) {
 		return new HeaderAssertions(result, mock(WebTestClient.ResponseSpec.class));
 	}
 
+	public static AssertionError assertThrows(Executable executable, String message) {
+		return Assertions.assertThrows(AssertionError.class, executable, message);
+	}
+
 }