[BAEL-12731] - Fixed tests in spring-boot-security module

spring-boot-security/src/test/java/com/baeldung/springbootsecurity/basic_auth/BasicAuthConfigurationIntegrationTest.java

@@ -15,6 +15,7 @@ import java.net.MalformedURLException;
 import java.net.URL;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;
 @RunWith(SpringRunner.class)
@@ -48,8 +49,6 @@ public class BasicAuthConfigurationIntegrationTest {
         ResponseEntity<String> response = restTemplate.getForEntity(base.toString(), String.class);
 
         assertEquals(HttpStatus.UNAUTHORIZED, response.getStatusCode());
-        assertTrue(response
-          .getBody()
-          .contains("Unauthorized"));
+        assertNull(response.getBody());
     }
 }