fix: flush result file at the end (#56)

src/interactor.rs

@@ -226,6 +226,7 @@ impl TriggerTestRunInteractor {
                         let mut file = File::create(&result_file).await?;
                         let data = serialize_event(&result_file, &event)?;
                         file.write_all(data.as_bytes()).await?;
+                        file.flush().await?;
                     }
                     if let Some(error_message) = stat.error_message {
                         formatter.message(&format!("Error message:"));