Polish AssertJ assertions

Polish AssertJ assertions

test/src/test/java/org/springframework/security/test/web/servlet/request/SecurityMockMvcRequestPostProcessorsCertificateTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -58,7 +58,7 @@ public class SecurityMockMvcRequestPostProcessorsCertificateTests {
 		X509Certificate[] certificates = (X509Certificate[]) postProcessedRequest
 				.getAttribute("javax.servlet.request.X509Certificate");
 
-		assertThat(certificates.length).isEqualTo(1);
+		assertThat(certificates).hasSize(1);
 		assertThat(certificates[0].getSubjectDN().getName()).isEqualTo(
 				"CN=rod, OU=Spring Security, O=Spring Framework");
 	}