Exception: NoSuchMethodError: The method 'pathFromUri' was called on null.

[ncb000gt]

I'm running into issues running flutter test- sometimes it's successful and other times it's not. I'm wondering if anyone has any ideas as to whether this is an issue on my end or not. Thanks.

---

This is an example of the output.

Shell: [ERROR:flutter/shell/testing/tester_main.cc(302)] Unhandled exception
Shell: Exception: NoSuchMethodError: The method 'pathFromUri' was called on null.
Shell: Receiver: null
Shell: Tried calling: pathFromUri(Instance of '_SimpleUri')
Shell: Stack trace: #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
Shell: #1      Context.fromUri (package:path/src/context.dart:1006:19)
Shell: #2      Context.prettyUri (package:path/src/context.dart:1068:28)
Shell: #3      prettyUri (package:path/path.dart:458:34)
Shell: #4      Frame.library (package:stack_trace/src/frame.dart:105:12)
Shell: #5      Frame.location (package:stack_trace/src/frame.dart:119:14)
Shell: #6      Chain.toString.<anonymous closure>.<anonymous closure> (package:stack_trace/src/chain.dart:256:33)
Shell: #7      MappedListIterable.elementAt (dart:_internal/iterable.dart:417:31)
Shell: #8      ListIterable.fold (dart:_internal/iterable.dart:195:30)
Shell: #9      Chain.toString.<anonymous closure> (package:stack_trace/src/chain.dart:257:12)
Shell: #10     MappedListIterable.elementAt (dart:_internal/iterable.dart:417:31)
Shell: #11     ListIterable.fold (dart:_internal/iterable.dart:195:30)
Shell: #12     Chain.toString (package:stack_trace/src/chain.dart:258:8)
Shell: #13     LazyChain.toString (package:stack_trace/src/lazy_chain.dart:32:31)
Shell: #14     RemoteException.serialize (package:test_api/src/util/remote_exception.dart:51:48)
Shell: #15     RemoteListener._sendError (package:test_api/src/remote_listener.dart:158:32)
Shell: #16     RemoteListener.start.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test_api/src/remote_listener.dart:130:11)
Shell: #17     _rootRunBinary (dart:async/zone.dart:1222:13)
Shell: #18     _CustomZone.runBinary (dart:async/zone.dart:1107:19)
Shell: #19     runZonedGuarded.<anonymous closure> (dart:async/zone.dart:1601:18)
Shell: #20     _CustomZone.handleUncaughtError (dart:async/zone.dart:1076:19)
Shell: #21     Future._propagateToListeners (dart:async/future_impl.dart:610:16)
Shell: #22     Future._completeError (dart:async/future_impl.dart:537:5)
Shell: #23     Future._asyncCompleteError.<anonymous closure> (dart:async/future_impl.dart:593:7)
Shell: #24     _rootRun (dart:async/zone.dart:1190:13)
Shell: #25     _CustomZone.run (dart:async/zone.dart:1093:19)
Shell: #26     _CustomZone.runGuarded (dart:async/zone.dart:997:7)
Shell: #27     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1037:23)
Shell: #28     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
Shell: #29     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
Shell:

I have put some logging in place and noticed that style is sometimes null during the execution, but not always which you can see below:
style.pathFromUri(_parseUri(uri))

flutter test test/integration-tests

00:02 +0: loading <path>/test/integration-tests/ui/apps/forgot_password_test.dart                                                                                                                                                                                         
STYLE: posix
00:03 +0: loading <path>/test/integration-tests/ui/apps/settings_test.dart                                                                                                                                                                                                
STYLE: posix
Shell: STYLE: null
Shell: [ERROR:flutter/shell/testing/tester_main.cc(302)] Unhandled exception
Shell: Exception: NoSuchMethodError: The method 'pathFromUri' was called on null.
Shell: Receiver: null
Shell: Tried calling: pathFromUri(Instance of '_SimpleUri')
Shell: Stack trace: #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
Shell: #1      Context.fromUri (package:path/src/context.dart:1006:19)
Shell: #2      Context.prettyUri (package:path/src/context.dart:1068:28)
Shell: #3      prettyUri (package:path/path.dart:458:34)
Shell: #4      Frame.library (package:stack_trace/src/frame.dart:105:12)
Shell: #5      Frame.location (package:stack_trace/src/frame.dart:119:14)
Shell: #6      Chain.toString.<anonymous closure>.<anonymous closure> (package:stack_trace/src/chain.dart:256:33)
Shell: #7      MappedListIterable.elementAt (dart:_internal/iterable.dart:417:31)
Shell: #8      ListIterable.fold (dart:_internal/iterable.dart:195:30)
Shell: #9      Chain.toString.<anonymous closure> (package:stack_trace/src/chain.dart:257:12)
Shell: #10     MappedListIterable.elementAt (dart:_internal/iterable.dart:417:31)
Shell: #11     ListIterable.fold (dart:_internal/iterable.dart:195:30)
Shell: #12     Chain.toString (package:stack_trace/src/chain.dart:258:8)
Shell: #13     LazyChain.toString (package:stack_trace/src/lazy_chain.dart:32:31)
Shell: #14     RemoteException.serialize (package:test_api/src/util/remote_exception.dart:51:48)
Shell: #15     RemoteListener._sendError (package:test_api/src/remote_listener.dart:158:32)
Shell: #16     RemoteListener.start.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test_api/src/remote_listener.dart:130:11)
Shell: #17     _rootRunBinary (dart:async/zone.dart:1222:13)
Shell: #18     _CustomZone.runBinary (dart:async/zone.dart:1107:19)
Shell: #19     runZonedGuarded.<anonymous closure> (dart:async/zone.dart:1601:18)
Shell: #20     _CustomZone.handleUncaughtError (dart:async/zone.dart:1076:19)
Shell: #21     Future._propagateToListeners (dart:async/future_impl.dart:610:16)
Shell: #22     Future._completeError (dart:async/future_impl.dart:537:5)
Shell: #23     Future._asyncCompleteError.<anonymous closure> (dart:async/future_impl.dart:593:7)
Shell: #24     _rootRun (dart:async/zone.dart:1190:13)
Shell: #25     _CustomZone.run (dart:async/zone.dart:1093:19)
Shell: #26     _CustomZone.runGuarded (dart:async/zone.dart:997:7)
Shell: #27     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1037:23)
Shell: #28     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
Shell: #29     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
Shell: 

Some additional info:
flutter doctor -v

flutter doctor -v
[✓] Flutter (Channel stable, 1.22.5, on macOS 11.1 20C69 darwin-x64, locale en-US)
    • Flutter version 1.22.5 at /Users/nick/Code/flutter
    • Framework revision 7891006299 (3 weeks ago), 2020-12-10 11:54:40 -0800
    • Engine revision ae90085a84
    • Dart version 2.10.4

 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/nick/Library/Android/sdk
    • Platform android-29, build-tools 29.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 12.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.3, Build version 12C33
    • CocoaPods version 1.9.3

[✓] Android Studio (version 3.5)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 42.1.1
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)

[✓] VS Code (version 1.52.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.18.0

 
[!] Connected device                          
    ! No devices available

! Doctor found issues in 1 category.

[natebosch]

Do you have a minimal reproduction case? What version of the package are you using, can you try updating?

I'm unable to see a code path where style could be null here.

[ncb000gt]

@natebosch path is on ^1.7.0. I can try 1.8.0 but it looks like it's a pre-release. I don't have a specific reproduction case. Sometimes I don't run into this issue, most of the time I do when running flutter test.

I didn't see anything obvious either about style being null or getting cleared which was why I opened the issue. Thanks for taking a look. I'll post more if I find more. Let me know if you notice anything else. Thanks

[natebosch]

I'm stumped.

The field is final.

path/lib/src/context.dart

Line 55 in 10c778c

final InternalStyle style;

The only 2 places which assign the field either have a null fallback, or assign directly to Style.platform.

path/lib/src/context.dart

Lines 37 to 38 in 10c778c

	if (style == null) {
	style = Style.platform;

path/lib/src/context.dart

Line 49 in 10c778c

: style = Style.platform as InternalStyle,

Style.platform can only hold a few values:

path/lib/src/style.dart

Lines 33 to 45 in 10c778c

	static final Style platform = _getPlatformStyle();
	/// Gets the type of the host platform.
	static Style _getPlatformStyle() {
	// If we're running a Dart file in the browser from a `file:` URI,
	// [Uri.base] will point to a file. If we're running on the standalone,
	// it will point to a directory. We can use that fact to determine which
	// style to use.
	if (Uri.base.scheme != 'file') return Style.url;
	if (!Uri.base.path.endsWith('/')) return Style.url;
	if (Uri(path: 'a/b').toFilePath() == 'a\\b') return Style.windows;
	return Style.posix;
	}

And all of those values posix, url, and windows are non-null because they are static final fields assigned with a call to a generative constructor.

Have you made any local modifications to the package before this started happening?

[ncb000gt]

Yea. It seemed really odd. I hadn't made any changes to the package prior to debugging, and even debugging was just logging out.

…

On Mon, Feb 8, 2021, 7:33 PM Nate Bosch ***@***.***> wrote: I'm stumped. The field is final. https://github.com/dart-lang/path/blob/10c778c799b2fc06036cbd0aa0e399ad4eb1ff5b/lib/src/context.dart#L55 The only 2 places which assign the field either have a null fallback, or assign directly to Style.platform. https://github.com/dart-lang/path/blob/10c778c799b2fc06036cbd0aa0e399ad4eb1ff5b/lib/src/context.dart#L37-L38 https://github.com/dart-lang/path/blob/10c778c799b2fc06036cbd0aa0e399ad4eb1ff5b/lib/src/context.dart#L49 Style.platform can only hold a few values: https://github.com/dart-lang/path/blob/10c778c799b2fc06036cbd0aa0e399ad4eb1ff5b/lib/src/style.dart#L33-L45 And all of those values posix, url, and windows are non-null because they are static final fields assigned with a call to a generative constructor. Have you made any local modifications to the package before this started happening? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#103 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAPJF3Z463JELXDQDUZLLLS6B7F5ANCNFSM4VRSHFJQ> .