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0889cca518
This also wires up the preview detector to trigger hot reloads when new previews are detected or previews are removed. Note: while this change results in lib/generated_preview.dart being generated and updated, it's not currently referenced by lib/main.dart and the preview environment will render a black screen. --------- Co-authored-by: Andrew Kolos <andrewrkolos@gmail.com>
93 lines
2.7 KiB
Dart
93 lines
2.7 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:async';
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import 'dart:convert';
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import 'package:file/file.dart';
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import 'package:flutter_tools/src/base/io.dart';
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import 'package:process/process.dart';
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import '../src/common.dart';
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import 'test_data/basic_project.dart';
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import 'test_utils.dart';
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const List<String> firstLaunchMessages = <String>[
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'Creating widget preview scaffolding at:',
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'Performing initial build of the Widget Preview Scaffold...',
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'Widget Preview Scaffold initial build complete.',
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'Loading previews into the Widget Preview Scaffold...',
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'Done loading previews.',
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];
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const List<String> subsequentLaunchMessages = <String>[
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'Loading previews into the Widget Preview Scaffold...',
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'Done loading previews.',
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];
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void main() {
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late Directory tempDir;
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Process? process;
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final BasicProject project = BasicProject();
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const ProcessManager processManager = LocalProcessManager();
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setUp(() async {
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tempDir = createResolvedTempDirectorySync('widget_preview_test.');
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await project.setUpIn(tempDir);
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});
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tearDown(() async {
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process?.kill();
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process = null;
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tryToDelete(tempDir);
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});
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Future<void> runWidgetPreview({required List<String> expectedMessages}) async {
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expect(expectedMessages, isNotEmpty);
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int i = 0;
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process = await processManager.start(<String>[
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flutterBin,
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'widget-preview',
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'start',
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], workingDirectory: tempDir.path);
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final Completer<void> completer = Completer<void>();
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process!.stdout.transform(utf8.decoder).transform(const LineSplitter()).listen((String msg) {
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printOnFailure('STDOUT: $msg');
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if (completer.isCompleted) {
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return;
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}
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if (msg.contains(expectedMessages[i])) {
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++i;
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}
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if (i == expectedMessages.length) {
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completer.complete();
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}
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});
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process!.stderr.transform(utf8.decoder).transform(const LineSplitter()).listen((String msg) {
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printOnFailure('STDERR: $msg');
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});
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await completer.future;
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process!.kill();
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process = null;
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}
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group('flutter widget-preview start', () {
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testWithoutContext('smoke test', () async {
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await runWidgetPreview(expectedMessages: firstLaunchMessages);
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});
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testWithoutContext('does not rebuild project on subsequent runs', () async {
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// The first run of 'flutter widget-preview start' should generate a new preview scaffold and
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// pre-build the application.
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await runWidgetPreview(expectedMessages: firstLaunchMessages);
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// We shouldn't regenerate the scaffold after the initial run.
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await runWidgetPreview(expectedMessages: subsequentLaunchMessages);
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});
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});
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}
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