snapshot of https://github.com/flutter/samples.git (main, 2026-09-16; blobs > 131072B omitted)

add_to_app/books/flutter_module_books/test/widget_test.dart

@@ -0,0 +1,54 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_module_books/api.dart';
+import 'package:flutter_module_books/main.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Pressing clear calls the cancel API', (tester) async {
+    MockHostBookApi mockHostApi = MockHostBookApi();
+
+    await tester.pumpWidget(
+      MaterialApp(home: BookDetail(hostApi: mockHostApi)),
+    );
+
+    await tester.tap(find.byIcon(Icons.clear));
+
+    expect(mockHostApi.cancelCalls, 1);
+  });
+
+  testWidgets('Pressing done calls the finish editing API', (
+    tester,
+  ) async {
+    MockHostBookApi mockHostApi = MockHostBookApi();
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: BookDetail(book: Book(), hostApi: mockHostApi),
+      ),
+    );
+
+    await tester.tap(find.byIcon(Icons.check));
+
+    expect(mockHostApi.booksFinished.length, 1);
+  });
+}
+
+// A super-simple mock for testing that calls are made to the API.
+class MockHostBookApi implements HostBookApi {
+  int cancelCalls = 0;
+  final booksFinished = <Book>[];
+
+  @override
+  Future<void> cancel() async {
+    cancelCalls++;
+  }
+
+  @override
+  Future<void> finishEditingBook(Book arg) async {
+    booksFinished.add(arg);
+  }
+}