ResponseEntity provides static "badRequest()" convenience method as well

Issue: SPR-12112

spring-web/src/test/java/org/springframework/http/ResponseEntityTests.java

@@ -101,6 +101,15 @@ public class ResponseEntityTests {
 		assertNull(responseEntity.getBody());
 	}
 
+	@Test
+	public void badRequest() throws URISyntaxException {
+		ResponseEntity<Void> responseEntity = ResponseEntity.badRequest().build();
+
+		assertNotNull(responseEntity);
+		assertEquals(HttpStatus.BAD_REQUEST, responseEntity.getStatusCode());
+		assertNull(responseEntity.getBody());
+	}
+
 	@Test
 	public void notFound() throws URISyntaxException {
 		ResponseEntity<Void> responseEntity = ResponseEntity.notFound().build();