added missing unit tests for xsrf related classes

scm-webapp/src/main/java/sonia/scm/security/Xsrf.java

@@ -41,5 +41,7 @@ public final class Xsrf {
   static final String HEADER_KEY = "X-XSRF-Token";
   
   static final String CLAIMS_KEY = "scm-manager.org/xsrf";
-  
+
+  private Xsrf() {
+  }
 }

scm-webapp/src/main/java/sonia/scm/security/XsrfTokenClaimsEnricher.java

@@ -62,6 +62,12 @@ public class XsrfTokenClaimsEnricher implements TokenClaimsEnricher {
   private final ScmConfiguration configuration;
   private final Provider<HttpServletRequest> requestProvider;
 
+  /**
+   * Constructs a new instance.
+   * 
+   * @param configuration scm main configuration
+   * @param requestProvider http request provider
+   */
   @Inject
   public XsrfTokenClaimsEnricher(ScmConfiguration configuration, Provider<HttpServletRequest> requestProvider) {
     this.configuration = configuration;