import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import akka.japi.Procedure;
-import com.google.common.base.Supplier;
import java.util.Collections;
+import java.util.function.Supplier;
import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;
import org.hamcrest.Matcher;