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Allow debugDefaultTargetPlatformOverride to be resetted with addTearDown #110488
Description
Activity
@passsy: Thanks for filing the issue. This issue is reproducible on the latest
stableandmasterchannels with provided sample code.console error logs
00:02 +0: reset debugDefaultTargetPlatformOverride with tearDown ══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════ The following assertion was thrown running a test: The value of a foundation debug variable was changed by the test. When the exception was thrown, this was the stack: #0 debugAssertAllFoundationVarsUnset.<anonymous closure> (package:flutter/src/foundation/debug.dart:34:7) #1 debugAssertAllFoundationVarsUnset (package:flutter/src/foundation/debug.dart:37:4) #2 TestWidgetsFlutterBinding._verifyInvariants (package:flutter_test/src/binding.dart:888:12) #3 AutomatedTestWidgetsFlutterBinding._verifyInvariants (package:flutter_test/src/binding.dart:1335:11) #4 TestWidgetsFlutterBinding._runTestBody (package:flutter_test/src/binding.dart:875:7) <asynchronous suspension> The test description was: reset debugDefaultTargetPlatformOverride with tearDown ════════════════════════════════════════════════════════════════════════════════════════════════════ 00:02 +0 -1: reset debugDefaultTargetPlatformOverride with tearDown [E] Test failed. See exception logs above. The test description was: reset debugDefaultTargetPlatformOverride with tearDown
flutter doctor -v
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[✓] Xcode - develop for iOS and macOS (Xcode 13.3) • Xcode at /Applications/Xcode.app/Contents/Developer • Build 13E113 • CocoaPods version 1.11.3 [✓] Chrome - develop for the web • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome [✓] Android Studio (version 2021.2) • Android Studio at /Applications/Android Studio.app/Contents • Flutter plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/6351-dart • Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840) [✓] IntelliJ IDEA Community Edition (version 2020.3.3) • IntelliJ at /Applications/IntelliJ IDEA CE.app • Flutter plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/6351-dart [✓] IntelliJ IDEA Community Edition (version 2022.1.1) • IntelliJ at /Users/huynq/Library/Application Support/JetBrains/Toolbox/apps/IDEA-C/ch-0/221.5591.52/IntelliJ IDEA CE.app • Flutter plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/6351-dart [✓] VS Code (version 1.70.2) • VS Code at /Applications/Visual Studio Code.app/Contents • Flutter extension version 3.46.0 [✓] Connected device (3 available) • SM T225 (mobile) • R9JT3004VRJ • android-arm64 • Android 12 (API 31) • macOS (desktop) • macos • darwin-x64 • macOS 12.5 21G72 darwin-x64 • Chrome (web) • chrome • web-javascript • Google Chrome 104.0.5112.101 [✓] HTTP Host Availability • All required HTTP hosts are available • No issues found!- added and removed
on Aug 30, 2022 My current workaround is a custom
addFlutterTearDownwhich only works with my customtestWidgets2method/// A special version of [addTearDown] that is executed before [testWidgets] completes. /// /// Only to be used in conjunction with [robotTest]. /// /// It is required for configurations that need to be reset before the flutter test finishes, like: /// /// - [debugDefaultTargetPlatformOverride] /// - [debugImageOverheadAllowance] /// - [debugInvertOversizedImages] /// - [debugOnPaintImage] /// - [debugNetworkImageHttpClientProvider] void addFlutterTearDown(dynamic Function() callback) { if (Invoker.current == null) { throw StateError('addFlutterTearDown() may only be called within a test.'); } final list = Zone.current[#flutter_test.teardowns] as List?; if (list == null) { throw StateError('addFlutterTearDown() may only be called within using testWidgets2'); } list.add(callback); }
import 'package:test_api/src/backend/invoker.dart'; @isTest void testWidgets2( String description, WidgetTesterCallback callback, { bool? skip, Timeout? timeout, bool semanticsEnabled = true, dynamic tags, }) { final List<dynamic Function()> flutterTearDowns = []; try { testWidgets( description, (tester) async { return runZoned( () async { try { await callback(tester); } finally { await Invoker.current!.runTearDowns(flutterTearDowns); flutterTearDowns.clear(); } }, zoneValues: { #flutter_test.teardowns: flutterTearDowns, }, ); }, skip: skip, timeout: timeout, semanticsEnabled: semanticsEnabled, tags: tags, ); } finally { flutterTearDowns.clear(); } }
So I guess P3 means 3 years later at least?
Is so counterintuitive for overriding
debugDefaultTargetPlatformOverride- added a commit that references this issue
on Sep 26, 2026 - added 4 commits that reference this issue
on Sep 28, 2026 This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.- locked as resolved and limited conversation to collaborators
on Oct 9, 2026
produces
I was expecting
addTearDownto be the correct solution because setting the override tonullmight not be executed at the end of the test when the test fails.In fact - without
addTearDown- all remaining tests will fail with the exception above when this test fails, because it never executesdebugDefaultTargetPlatformOverride = null;.How to fix
_verifyInvariantsshould be called after executing alladdTearDown.