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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:async';
import 'package:file/memory.dart';
import 'package:flutter_tools/src/base/common.dart';
import 'package:flutter_tools/src/base/context.dart';
import 'package:flutter_tools/src/base/file_system.dart';
import 'package:flutter_tools/src/base/io.dart';
import 'package:flutter_tools/src/base/platform.dart';
import 'package:flutter_tools/src/globals.dart' as globals;
import 'package:meta/meta.dart';
import 'package:path/path.dart' as path; // flutter_ignore: package_path_import
import 'package:test_api/test_api.dart' as test_package show test; // ignore: deprecated_member_use
import 'package:test_api/test_api.dart' hide test; // ignore: deprecated_member_use
export 'package:test_api/test_api.dart' hide isInstanceOf, test; // ignore: deprecated_member_use
void tryToDelete(FileSystemEntity fileEntity) {
// This should not be necessary, but it turns out that
// on Windows it's common for deletions to fail due to
// bogus (we think) "access denied" errors.
try {
if (fileEntity.existsSync()) {
fileEntity.deleteSync(recursive: true);
}
} on FileSystemException catch (error) {
// We print this so that it's visible in the logs, to get an idea of how
// common this problem is, and if any patterns are ever noticed by anyone.
// ignore: avoid_print
print('Failed to delete ${fileEntity.path}: $error');
}
}
/// Gets the path to the root of the Flutter repository.
///
/// This will first look for a `FLUTTER_ROOT` environment variable. If the
/// environment variable is set, it will be returned. Otherwise, this will
/// deduce the path from `platform.script`.
String getFlutterRoot() {
const Platform platform = LocalPlatform();
if (platform.environment.containsKey('FLUTTER_ROOT')) {
return platform.environment['FLUTTER_ROOT']!;
}
Error invalidScript() => StateError('Could not determine flutter_tools/ path from script URL (${globals.platform.script}); consider setting FLUTTER_ROOT explicitly.');
Uri scriptUri;
switch (platform.script.scheme) {
case 'file':
scriptUri = platform.script;
break;
case 'data':
final RegExp flutterTools = RegExp(r'(file://[^"]*[/\\]flutter_tools[/\\][^"]+\.dart)', multiLine: true);
final Match? match = flutterTools.firstMatch(Uri.decodeFull(platform.script.path));
if (match == null) {
throw invalidScript();
}
scriptUri = Uri.parse(match.group(1)!);
break;
default:
throw invalidScript();
}
final List<String> parts = path.split(globals.localFileSystem.path.fromUri(scriptUri));
final int toolsIndex = parts.indexOf('flutter_tools');
if (toolsIndex == -1) {
throw invalidScript();
}
final String toolsPath = path.joinAll(parts.sublist(0, toolsIndex + 1));
return path.normalize(path.join(toolsPath, '..', '..'));
}
/// Capture console print events into a string buffer.
Future<StringBuffer> capturedConsolePrint(Future<void> Function() body) async {
final StringBuffer buffer = StringBuffer();
await runZoned<Future<void>>(() async {
// Service the event loop.
await body();
}, zoneSpecification: ZoneSpecification(print: (Zone self, ZoneDelegate parent, Zone zone, String line) {
buffer.writeln(line);
}));
return buffer;
}
/// Matcher for functions that throw [AssertionError].
final Matcher throwsAssertionError = throwsA(isA<AssertionError>());
/// Matcher for functions that throw [ToolExit].
Matcher throwsToolExit({ int? exitCode, Pattern? message }) {
Matcher matcher = _isToolExit;
if (exitCode != null) {
matcher = allOf(matcher, (ToolExit e) => e.exitCode == exitCode);
}
if (message != null) {
matcher = allOf(matcher, (ToolExit e) => e.message?.contains(message) ?? false);
}
return throwsA(matcher);
}
/// Matcher for [ToolExit]s.
final TypeMatcher<ToolExit> _isToolExit = isA<ToolExit>();
/// Matcher for functions that throw [ProcessException].
Matcher throwsProcessException({ Pattern? message }) {
Matcher matcher = _isProcessException;
if (message != null) {
matcher = allOf(matcher, (ProcessException e) => e.message.contains(message));
}
return throwsA(matcher);
}
/// Matcher for [ProcessException]s.
final TypeMatcher<ProcessException> _isProcessException = isA<ProcessException>();
Future<void> expectToolExitLater(Future<dynamic> future, Matcher messageMatcher) async {
try {
await future;
fail('ToolExit expected, but nothing thrown');
} on ToolExit catch(e) {
expect(e.message, messageMatcher);
// Catch all exceptions to give a better test failure message.
} catch (e, trace) { // ignore: avoid_catches_without_on_clauses
fail('ToolExit expected, got $e\n$trace');
}
}
Future<void> expectReturnsNormallyLater(Future<dynamic> future) async {
try {
await future;
// Catch all exceptions to give a better test failure message.
} catch (e, trace) { // ignore: avoid_catches_without_on_clauses
fail('Expected to run with no exceptions, got $e\n$trace');
}
}
Matcher containsIgnoringWhitespace(String toSearch) {
return predicate(
(String source) {
return collapseWhitespace(source).contains(collapseWhitespace(toSearch));
},
'contains "$toSearch" ignoring whitespace.',
);
}
/// The tool overrides `test` to ensure that files created under the
/// system temporary directory are deleted after each test by calling
/// `LocalFileSystem.dispose()`.
@isTest
void test(String description, FutureOr<void> Function() body, {
String? testOn,
dynamic skip,
List<String>? tags,
Map<String, dynamic>? onPlatform,
int? retry,
}) {
test_package.test(
description,
() async {
addTearDown(() async {
await globals.localFileSystem.dispose();
});
return body();
},
skip: skip,
tags: tags,
onPlatform: onPlatform,
retry: retry,
testOn: testOn,
// We don't support "timeout"; see ../../dart_test.yaml which
// configures all tests to have a 15 minute timeout which should
// definitely be enough.
);
}
/// Executes a test body in zone that does not allow context-based injection.
///
/// For classes which have been refactored to exclude context-based injection
/// or globals like [fs] or [platform], prefer using this test method as it
/// will prevent accidentally including these context getters in future code
/// changes.
///
/// For more information, see https://github.com/flutter/flutter/issues/47161
@isTest
void testWithoutContext(String description, FutureOr<void> Function() body, {
String? testOn,
dynamic skip,
List<String>? tags,
Map<String, dynamic>? onPlatform,
int? retry,
}) {
return test(
description, () async {
return runZoned(body, zoneValues: <Object, Object>{
contextKey: const _NoContext(),
});
},
skip: skip,
tags: tags,
onPlatform: onPlatform,
retry: retry,
testOn: testOn,
// We don't support "timeout"; see ../../dart_test.yaml which
// configures all tests to have a 15 minute timeout which should
// definitely be enough.
);
}
/// An implementation of [AppContext] that throws if context.get is called in the test.
///
/// The intention of the class is to ensure we do not accidentally regress when
/// moving towards more explicit dependency injection by accidentally using
/// a Zone value in place of a constructor parameter.
class _NoContext implements AppContext {
const _NoContext();
@override
T get<T>() {
throw UnsupportedError(
'context.get<$T> is not supported in test methods. '
'Use Testbed or testUsingContext if accessing Zone injected '
'values.'
);
}
@override
String get name => 'No Context';
@override
Future<V> run<V>({
required FutureOr<V> Function() body,
String? name,
Map<Type, Generator>? overrides,
Map<Type, Generator>? fallbacks,
ZoneSpecification? zoneSpecification,
}) async {
return body();
}
}
/// Allows inserting file system exceptions into certain
/// [MemoryFileSystem] operations by tagging path/op combinations.
///
/// Example use:
///
/// ```
/// void main() {
/// var handler = FileExceptionHandler();
/// var fs = MemoryFileSystem(opHandle: handler.opHandle);
///
/// var file = fs.file('foo')..createSync();
/// handler.addError(file, FileSystemOp.read, FileSystemException('Error Reading foo'));
///
/// expect(() => file.writeAsStringSync('A'), throwsA(isA<FileSystemException>()));
/// }
/// ```
class FileExceptionHandler {
final Map<String, Map<FileSystemOp, FileSystemException>> _contextErrors = <String, Map<FileSystemOp, FileSystemException>>{};
final Map<FileSystemOp, FileSystemException> _tempErrors = <FileSystemOp, FileSystemException>{};
static final RegExp _tempDirectoryEnd = RegExp('rand[0-9]+');
/// Add an exception that will be thrown whenever the file system attached to this
/// handler performs the [operation] on the [entity].
void addError(FileSystemEntity entity, FileSystemOp operation, FileSystemException exception) {
final String path = entity.path;
_contextErrors[path] ??= <FileSystemOp, FileSystemException>{};
_contextErrors[path]![operation] = exception;
}
void addTempError(FileSystemOp operation, FileSystemException exception) {
_tempErrors[operation] = exception;
}
/// Tear-off this method and pass it to the memory filesystem `opHandle` parameter.
void opHandle(String path, FileSystemOp operation) {
if (path.startsWith('.tmp_') || _tempDirectoryEnd.firstMatch(path) != null) {
final FileSystemException? exception = _tempErrors[operation];
if (exception != null) {
throw exception;
}
}
final Map<FileSystemOp, FileSystemException>? exceptions = _contextErrors[path];
if (exceptions == null) {
return;
}
final FileSystemException? exception = exceptions[operation];
if (exception == null) {
return;
}
throw exception;
}
}