Take into account Sonar comments

Author: thboileau

org.restlet/src/test/java/org/restlet/security/HttpBasicTestCase.java

@@ -33,6 +33,7 @@
 import org.restlet.data.Method;
 import org.restlet.data.Protocol;
 import org.restlet.data.Status;
+import org.restlet.engine.Engine;
 
 /**
  * Restlet unit tests for HTTP Basic authentication client/server.
@@ -61,13 +62,6 @@ static Stream<Arguments> validCredentials() {
                 arguments(LONG_USERNAME, LONG_PASSWORD), arguments(SHORT_USERNAME, SHORT_PASSWORD));
     }
 
-    public static class AuthenticatedRestlet extends Restlet {
-        @Override
-        public void handle(Request request, Response response) {
-            response.setEntity(AUTHENTICATED_MSG, MediaType.TEXT_PLAIN);
-        }
-    }
-
     public static class TestVerifier extends MapVerifier {
         public TestVerifier() {
             getLocalSecrets().put(SHORT_USERNAME, SHORT_PASSWORD.toCharArray());
@@ -111,6 +105,13 @@ class TestHttpBasicServer {
         private Request request;
         private Client client;
 
+        public static class AuthenticatedRestlet extends Restlet {
+            @Override
+            public void handle(Request request, Response response) {
+                response.setEntity(AUTHENTICATED_MSG, MediaType.TEXT_PLAIN);
+            }
+        }
+
         @Test
         void HttpBasicNone() {
             final Response response = client.handle(request);
@@ -142,6 +143,9 @@ void testValidCredentials(final String login, final String password) throws Exce
 
         @BeforeEach
         void makeServer() throws Exception {
+            Engine.clear();
+            Engine.getInstance();
+
             final String REALM = HttpBasicTestCase.class.getSimpleName();
             this.component = new Component();
             final Server server = this.component.getServers().add(Protocol.HTTP, 0);