import java.io.IOException;
import java.net.MalformedURLException;
import java.security.GeneralSecurityException;
-import java.util.*;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Set;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;