diff --git a/flutter_app/test/scratch_diag_test.dart b/flutter_app/test/scratch_diag_test.dart
deleted file mode 100644
index c95aa5a..0000000
--- a/flutter_app/test/scratch_diag_test.dart
+++ /dev/null
@@ -1,83 +0,0 @@
-import 'dart:convert';
-import 'dart:io';
-
-import 'package:crypto/crypto.dart' show sha256;
-import 'package:flutter/material.dart';
-import 'package:flutter_test/flutter_test.dart';
-import 'package:http/http.dart' as http;
-import 'package:http/testing.dart';
-import 'package:observer/camera/model_catalog_section.dart';
-import 'package:observer/models/model_manager.dart';
-
-const _modelBytes = [1, 2, 3, 4, 5, 6, 7, 8];
-String _shaHex(List<int> bytes) => sha256.convert(bytes).toString();
-
-Map<String, dynamic> _item() => {
-      'datasetId': 7,
-      'datasetName': '环颈雉鸡数据集',
-      'version': 'v1.0.0',
-      'labels': ['pheasant', 'suspect'],
-      'sizeBytes': _modelBytes.length,
-      'sha256': _shaHex(_modelBytes),
-      'downloadUrl': '/download/models/7/latest.tflite',
-      'coverUrl': '/api/v1/app/cover?namePrefix=RNPHE',
-    };
-
-void main() {
-  late Directory root;
-
-  setUp(() async {
-    root = await Directory.systemTemp.createTemp('catalog-diag');
-  });
-
-  tearDown(() => root.delete(recursive: true));
-
-  ModelManager manager() => ModelManager(
-        baseUrl: 'http://test.local',
-        client: MockClient((req) async {
-          if (req.url.path == '/api/v1/app/update') {
-            return http.Response.bytes(
-                utf8.encode(jsonEncode({
-                  'code': 0,
-                  'message': 'ok',
-                  'data': {'models': [_item()]}
-                })),
-                200);
-          }
-          if (req.url.path.startsWith('/download/models/')) {
-            return http.Response.bytes(_modelBytes, 200);
-          }
-          return http.Response('not found', 404);
-        }),
-        rootDir: () async => root,
-      );
-
-  testWidgets('diag step marker', (tester) async {
-    print('=== BEFORE manager()');
-    final m = manager();
-    print('=== BEFORE refresh()');
-    await m.refresh();
-    print('=== AFTER refresh() ready=${m.ready} catalog=${m.catalog.length}');
-    await tester.pumpWidget(MaterialApp(
-        home: Scaffold(body: ModelCatalogSection(manager: m))));
-    print('=== AFTER pumpWidget');
-    for (var i = 0; i < 15; i++) {
-      await tester.pump(const Duration(milliseconds: 200));
-      final spinners = find.byType(CircularProgressIndicator).evaluate().length;
-      final icons = find.byIcon(Icons.image_not_supported_outlined).evaluate().length;
-      print('pump $i scheduled=${tester.binding.hasScheduledFrame} '
-          'spinner=$spinners errIcon=$icons');
-    }
-    print('=== bounded pumpAndSettle attempt');
-    try {
-      await tester.pumpAndSettle(
-          const Duration(milliseconds: 100),
-          EnginePhase.sendSemanticsUpdate,
-          const Duration(seconds: 5));
-      print('=== pumpAndSettle OK');
-    } catch (e) {
-      print('=== pumpAndSettle TIMEOUT: $e');
-    }
-    print('=== DONE');
-  });
-}