Fixed test

src/test/java/org/gcube/gcat/client/ContextTest.java

@@ -70,7 +70,8 @@ public class ContextTest {
 	
 	public static void set(Secret secret) throws Exception {
 		SecretManagerProvider.instance.reset();
-		SecretManager secretManager = SecretManagerProvider.instance.get();
+		SecretManager secretManager = new SecretManager(); 
+		SecretManagerProvider.instance.set(secretManager);
 		secretManager.addSecret(secret);
 		secretManager.set();
 		String username = secretManager.getUser().getUsername();