TestMetadataEvent

        TestLauncher launcher = ...;
        launcher.addProgressListener(new ProgressListener() {
            void statusChanged(ProgressEvent event) {
                if (event instanceof TestMetadataEvent) {
                    if (event instanceof TestFileAttachmentMetadataEvent) {
                        // Do something with file attachment
                    } else if (event instanceof TestKeyValueMetadataEvent) {
                        // Do something with key-values
                    } else {
                        // ignore unrecognized events
                    }
                }
            }
        });