Random errors on run flutter test with --coverage #35907
Description
Steps to Reproduce
Run flutter test --coverage on Flutter version > v1.5.3.
On every run, the errors below occur in a different test. We have more than 1,000 tests and the Flutter v1.5.3 runs without a problem.
If we run flutter test without the --coverage there is no problem.
MacBook Pro (Retina, 15-inch, Mid 2015)
2,2 GHz Intel Core i7
16 GB 1600 MHz DDR3
ProductName: Mac OS X (Mojave)
ProductVersion: 10.14.5
BuildVersion: 18F132
Logs
NoSuchMethodError: The getter 'iterator' was called on null.
Receiver: null
Tried calling: iterator
dart:core-patch/object_patch.dart 50:5 Object.noSuchMethod
package:flutter_tools/src/test/coverage_collector.dart 181:51 _getAllCoverage
===== asynchronous gap ===========================
dart:async/future_impl.dart 22:43 _Completer.completeError
dart:async-patch/async_patch.dart 40:18 _AsyncAwaitCompleter.completeError
package:flutter_tools/src/test/coverage_collector.dart _getAllCoverage
===== asynchronous gap ===========================
dart:async/zone.dart 1053:19 _CustomZone.registerUnaryCallback
dart:async-patch/async_patch.dart 77:23 _asyncThenWrapperHelper
package:flutter_tools/src/test/coverage_collector.dart _getAllCoverage
package:flutter_tools/src/test/coverage_collector.dart 165:10 collect
===== asynchronous gap ===========================
dart:async/zone.dart 1053:19 _CustomZone.registerUnaryCallback
dart:async-patch/async_patch.dart 77:23 _asyncThenWrapperHelper
package:flutter_tools/src/test/coverage_collector.dart collect
package:flutter_tools/src/test/coverage_collector.dart 61:45 CoverageCollector.collectCoverage
===== asynchronous gap ===========================
dart:async/zone.dart 1053:19 _CustomZone.registerUnaryCallback
dart:async-patch/async_patch.dart 77:23 _asyncThenWrapperHelper
package:flutter_tools/src/test/flutter_platform.dart FlutterPlatform._startTest
package:flutter_tools/src/test/flutter_platform.dart 362:36 FlutterPlatform.loadChannel
package:flutter_tools/src/test/flutter_platform.dart 315:46 FlutterPlatform.load
===== asynchronous gap ===========================
dart:async/zone.dart 1053:19 _CustomZone.registerUnaryCallback
dart:async-patch/async_patch.dart 77:23 _asyncThenWrapperHelper
package:test_core/src/runner/loader.dart Loader.loadFile.<fn>
package:test_core/src/runner/load_suite.dart 98:31 new LoadSuite.<fn>.<fn>
===== asynchronous gap ===========================
dart:async/zone.dart 1045:19 _CustomZone.registerCallback
dart:async/zone.dart 962:22 _CustomZone.bindCallbackGuarded
dart:async/timer.dart 52:45 new Timer
dart:async/timer.dart 87:9 Timer.run
dart:async/future.dart 174:11 new Future
package:test_api/src/backend/invoker.dart 399:21 Invoker._onRun.<fn>.<fn>.<fn>
or
NoSuchMethodError: The getter 'iterator' was called on null.
Receiver: null
Tried calling: iterator
dart:core-patch/object_patch.dart 50:5 Object.noSuchMethod
package:flutter_tools/src/test/coverage_collector.dart 222:52 _buildCoverageMap
package:flutter_tools/src/test/coverage_collector.dart 208:5 _getAllCoverage
===== asynchronous gap ===========================
dart:async/future_impl.dart 22:43 _Completer.completeError
dart:async-patch/async_patch.dart 40:18 _AsyncAwaitCompleter.completeError
package:flutter_tools/src/test/coverage_collector.dart _getAllCoverage
===== asynchronous gap ===========================
dart:async/zone.dart 1053:19 _CustomZone.registerUnaryCallback
dart:async-patch/async_patch.dart 77:23 _asyncThenWrapperHelper
package:flutter_tools/src/test/coverage_collector.dart _getAllCoverage
package:flutter_tools/src/test/coverage_collector.dart 165:10 collect
===== asynchronous gap ===========================
dart:async/zone.dart 1053:19 _CustomZone.registerUnaryCallback
dart:async-patch/async_patch.dart 77:23 _asyncThenWrapperHelper
package:flutter_tools/src/test/coverage_collector.dart collect
package:flutter_tools/src/test/coverage_collector.dart 61:45 CoverageCollector.collectCoverage
===== asynchronous gap ===========================
dart:async/zone.dart 1053:19 _CustomZone.registerUnaryCallback
dart:async-patch/async_patch.dart 77:23 _asyncThenWrapperHelper
package:flutter_tools/src/test/flutter_platform.dart FlutterPlatform._startTest
package:flutter_tools/src/test/flutter_platform.dart 362:36 FlutterPlatform.loadChannel
package:flutter_tools/src/test/flutter_platform.dart 315:46 FlutterPlatform.load
===== asynchronous gap ===========================
dart:async/zone.dart 1053:19 _CustomZone.registerUnaryCallback
dart:async-patch/async_patch.dart 77:23 _asyncThenWrapperHelper
package:test_core/src/runner/loader.dart Loader.loadFile.<fn>
package:test_core/src/runner/load_suite.dart 98:31 new LoadSuite.<fn>.<fn>
===== asynchronous gap ===========================
dart:async/zone.dart 1045:19 _CustomZone.registerCallback
dart:async/zone.dart 962:22 _CustomZone.bindCallbackGuarded
dart:async/timer.dart 52:45 new Timer
dart:async/timer.dart 87:9 Timer.run
dart:async/future.dart 174:11 new Future
package:test_api/src/backend/invoker.dart 399:21 Invoker._onRun.<fn>.<fn>.<fn>
flutter analyze
Analyzing blu-flutter...
No issues found! (ran in 6.5s)
flutter doctor -v
[✓] Flutter (Channel stable, v1.7.8+hotfix.3, on Mac OS X 10.14.5 18F132, locale pt-BR)
• Flutter version 1.7.8+hotfix.3 at /Users/mateus.gustavo/desenvolvimento/flutter
• Framework revision b712a172f9 (24 hours ago), 2019-07-09 13:14:38 -0700
• Engine revision 54ad777fd2
• Dart version 2.4.0
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at /Users/mateus.gustavo/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• ANDROID_HOME = /Users/mateus.gustavo/Library/Android/sdk
• ANDROID_SDK_ROOT = /usr/local/share/android-sdk
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 10.2.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 10.2.1, Build version 10E1001
• CocoaPods version 1.7.4
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• ios-deploy 1.9.4
[✓] Android Studio (version 3.4)
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• Flutter plugin version 35.1.1
• Dart plugin version 183.6270
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[✓] IntelliJ IDEA Community Edition (version 2019.1.1)
• IntelliJ at /Applications/IntelliJ IDEA CE.app
• Flutter plugin version 31.3.4
• Dart plugin version 183.4886.3
[✓] VS Code (version 1.36.1)
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[✓] Connected device (1 available)
• iPhone de Minijobs • e3c4fd5389c129ebb1ad214365a57b6a7bc67269 • ios • iOS 12.1.3
• No issues found!