The Compiler is broken when using mockito unit testing

[alextech]

Compiler crashes when mocking a dependency with mockito 0.11 and test 0.12.4+9 on Windows 10. Compiler executed with pub.bat run test:test -p phantomjs

Unable to figure out how to fix. Unit test files looks like this but I am not sure if I stripped too much code for this report. Constructors are just as shown. I do not know where exactly to look for the issue at this point.

import 'package:test/test.dart';
import 'package:mockito/mockito.dart';

class AReactView {
    void addEventListener(String eventName) {
        print ("event subscription suppose to occur");
    }

    void set state(Map state) {
        print("state received");
    }
}

class TestThis {
    AReactView dep;

    TestThis(AReactView dependency) {
        this.dep = dependency;
    }
}

class MockReactView extends Mock implements AReactView{
    noSuchMethod(i) => super.noSuchMethod(i);
}
void main() {
     test('Test mock methods get called', () {
         var mockReactView = new MockReactView();
         TestThis t = new TestThis(mockReactView);
});
}

Crash report:
../../../../../AROMAN~1/AppData/Local/Temp/dart_test_64e139b1-694a-11e5-9bcf-5c260a791bae/runInBrowser.dart:
Warning:
****************************************************************
* WARNING: dart:mirrors support in dart2js is experimental,
* and not recommended.
* This implementation of mirrors is incomplete,
* and often greatly increases the size of the generated
* JavaScript code.
*
* Your app imports dart:mirrors via:
* test/views/MyComponentView_test.dart => package:mockito => dart:mirrors
*
* You can disable this message by using the --enable-experimental-mirrors
* command-line flag.
*
* To learn what to do next, please visit:
* http://dartlang.org/dart2js-reflection
****************************************************************

packages/mockito/mockito.dart:215:30:
Hint: Using 'MirrorSystem.getName' may lead to unnecessarily large generated code.
Try adding '@MirrorsUsed(...)' as described at https://goo.gl/Akrrog.
      return "${MirrorSystem.getName(key)}: ${invocation.namedArguments[key]}";
                             ^^^^^^^
packages/mockito/mockito.dart:221:34:
Hint: Using 'MirrorSystem.getName' may lead to unnecessarily large generated code.
Try adding '@MirrorsUsed(...)' as described at https://goo.gl/Akrrog.
    String method = MirrorSystem.getName(invocation.memberName);
                                 ^^^^^^^
../../../../../AROMAN~1/AppData/Local/Temp/dart_test_64e139b1-694a-11e5-9bcf-5c260a791bae/runInBrowser.dart:
Internal Error: The compiler crashed when compiling this element.

The compiler is broken.

When compiling the above element, the compiler crashed. It is not
possible to tell if this is caused by a problem in your program or
not. Regardless, the compiler should not crash.

The Dart team would greatly appreciate if you would take a moment to
report this problem at http://dartbug.com/new.

Please include the following information:

* the name and version of your operating system,

* the Dart SDK build number (1.12.1), and

* the entire message you see here (including the full stack trace
  below as well as the source location above).

The compiler crashed: The null object does not have a method 'markSeen'.

NoSuchMethodError: method not found: 'markSeen'
Receiver: null
Arguments: [Instance of 'TokenCounter']
#0      Object._noSuchMethod (dart:core-patch/object_patch.dart:42)
#1      Object.noSuchMethod (dart:core-patch/object_patch.dart:45)
#2      _ForwardingMetadataEntry.markSeen (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js_emitter/metadata_collector.dart:82)
#3      TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:102)
#4      BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119)
#5      BaseVisitor.visitToken (package:js_ast/src/nodes.dart:150)
#6      BaseVisitor.visitDeferredNumber (package:js_ast/src/nodes.dart:153)
#7      DeferredNumber.accept (package:js_ast/src/nodes.dart:984)
#8      ArrayInitializer.visitChildren (package:js_ast/src/nodes.dart:1089)
#9      BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#10     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#11     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119)
#12     BaseVisitor.visitArrayInitializer (package:js_ast/src/nodes.dart:167)
#13     ArrayInitializer.accept (package:js_ast/src/nodes.dart:1086)
#14     _BoundMetadataEntry.markSeen (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js_emitter/metadata_collector.dart:47)
#15     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:102)
#16     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119)
#17     BaseVisitor.visitToken (package:js_ast/src/nodes.dart:150)
#18     BaseVisitor.visitDeferredNumber (package:js_ast/src/nodes.dart:153)
#19     DeferredNumber.accept (package:js_ast/src/nodes.dart:984)
#20     ArrayInitializer.visitChildren (package:js_ast/src/nodes.dart:1089)
#21     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#22     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#23     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119)
#24     BaseVisitor.visitArrayInitializer (package:js_ast/src/nodes.dart:167)
#25     ArrayInitializer.accept (package:js_ast/src/nodes.dart:1086)
#26     Property.visitChildren (package:js_ast/src/nodes.dart:1146)
#27     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#28     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#29     BaseVisitor.visitProperty (package:js_ast/src/nodes.dart:170)
#30     Property.accept (package:js_ast/src/nodes.dart:1142)
#31     ObjectInitializer.visitChildren (package:js_ast/src/nodes.dart:1127)
#32     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#33     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#34     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119)
#35     BaseVisitor.visitObjectInitializer (package:js_ast/src/nodes.dart:169)
#36     ObjectInitializer.accept (package:js_ast/src/nodes.dart:1124)
#37     ArrayInitializer.visitChildren (package:js_ast/src/nodes.dart:1089)
#38     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#39     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#40     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119)
#41     BaseVisitor.visitArrayInitializer (package:js_ast/src/nodes.dart:167)
#42     ArrayInitializer.accept (package:js_ast/src/nodes.dart:1086)
#43     ArrayInitializer.visitChildren (package:js_ast/src/nodes.dart:1089)
#44     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#45     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#46     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119)
#47     BaseVisitor.visitArrayInitializer (package:js_ast/src/nodes.dart:167)
#48     ArrayInitializer.accept (package:js_ast/src/nodes.dart:1086)
#49     Assignment.visitChildren (package:js_ast/src/nodes.dart:675)
#50     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#51     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#52     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119)
#53     BaseVisitor.visitAssignment (package:js_ast/src/nodes.dart:125)
#54     BaseVisitor.visitVariableInitialization (package:js_ast/src/nodes.dart:128)
#55     VariableInitialization.accept (package:js_ast/src/nodes.dart:689)
#56     VariableDeclarationList.visitChildren (package:js_ast/src/nodes.dart:648)
#57     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#58     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#59     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119)
#60     BaseVisitor.visitVariableDeclarationList (package:js_ast/src/nodes.dart:124)
#61     VariableDeclarationList.accept (package:js_ast/src/nodes.dart:644)
#62     ExpressionStatement.visitChildren (package:js_ast/src/nodes.dart:269)
#63     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#64     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#65     BaseVisitor.visitStatement (package:js_ast/src/nodes.dart:91)
#66     BaseVisitor.visitExpressionStatement (package:js_ast/src/nodes.dart:97)
#67     ExpressionStatement.accept (package:js_ast/src/nodes.dart:268)
#68     Block.visitChildren (package:js_ast/src/nodes.dart:257)
#69     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#70     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#71     BaseVisitor.visitStatement (package:js_ast/src/nodes.dart:91)
#72     BaseVisitor.visitBlock (package:js_ast/src/nodes.dart:95)
#73     Block.accept (package:js_ast/src/nodes.dart:255)
#74     Fun.visitChildren (package:js_ast/src/nodes.dart:917)
#75     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#76     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#77     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119)
#78     BaseVisitor.visitFun (package:js_ast/src/nodes.dart:148)
#79     Fun.accept (package:js_ast/src/nodes.dart:913)
#80     Call.visitChildren (package:js_ast/src/nodes.dart:727)
#81     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#82     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#83     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119)
#84     BaseVisitor.visitCall (package:js_ast/src/nodes.dart:135)
#85     Call.accept (package:js_ast/src/nodes.dart:724)
#86     ExpressionStatement.visitChildren (package:js_ast/src/nodes.dart:269)
#87     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#88     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#89     BaseVisitor.visitStatement (package:js_ast/src/nodes.dart:91)
#90     BaseVisitor.visitExpressionStatement (package:js_ast/src/nodes.dart:97)
#91     ExpressionStatement.accept (package:js_ast/src/nodes.dart:268)
#92     Program.visitChildren (package:js_ast/src/nodes.dart:241)
#93     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85)
#94     TokenCounter.visitNode (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:104)
#95     BaseVisitor.visitProgram (package:js_ast/src/nodes.dart:89)
#96     Program.accept (package:js_ast/src/nodes.dart:239)
#97     TokenCounter.countTokens (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js/js.dart:108)
#98     Emitter.finalizeTokensInAst (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart:1755)
#99     Emitter.emitProgram (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart:1791)
#100    CodeEmitterTask.assembleProgram.<anonymous closure> (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart:146)
#101    CompilerTask.measure (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/compiler.dart:2213)
#102    CodeEmitterTask.assembleProgram (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart:140)
#103    JavaScriptBackend.assembleProgram (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/js_backend/backend.dart:1490)
#104    Compiler.compileLoadedLibraries (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/compiler.dart:1685)
#105    Compiler.runCompiler.<anonymous closure> (file:///E:/b/build/slave/dart-sdk-windows-stable/build/sdk/pkg/compiler/lib/src/compiler.dart:1524)
#106    _RootZone.runUnary (dart:async/zone.dart:1166)
#107    _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:494)
#108    _Future._propagateToListeners (dart:async/future_impl.dart:577)
#109    _Future._completeWithValue (dart:async/future_impl.dart:368)
#110    _Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:422)
#111    _microtaskLoop (dart:async/schedule_microtask.dart:43)
#112    _microtaskLoopEntry (dart:async/schedule_microtask.dart:52)
#113    _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:96)
#114    _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:149)

[harryterkelsen]

I can't repro the crash with the file provided. Can you try running dart2js on the code in checked mode and sharing the results?

DART_VM_OPTIONS="--checked" dart2js <your dart file>

[alextech]

Thank you very much for the reply. Adding --checked parameter produced identical output. I was able to narrow the issue down to combination of mockito and stagexl libraries. The pubspec file is

dependencies:
   stagexl: any
dev_dependencies:
   test: "^0.12.4"
   mockito: "^0.11.0"

UnitTest file that causes the crash:

import 'package:test/test.dart';
import 'package:mockito/mockito.dart';

import 'package:stagexl/stagexl.dart';

class AReactView {
  void addEventListener(String eventName) {
    print ("event subscription suppose to occur");
  }

  void set state(Map state) {
    print("state received");
  }
}


class MockReactView extends Mock implements AReactView{

  noSuchMethod(i) => super.noSuchMethod(i);
}

class TestThis extends DisplayObjectContainer {
  AReactView dep;

  TestThis(AReactView dependency) {
    this.dep = dependency;
  }
}

void main() {
  test('Replicate compiler crash', () {

      var mockView = new MockReactView();
      mockView.addEventListener("TEST LISTENER");

      TestThis subject = new TestThis();
      subject.tabChildren = true;
      print(subject.tabChildren);


      verify(mockView.addEventListener("TEST LISTENER"));

    // sanity check
      expect(1, 1);
  });
}

In this example, instantiating a mock for AReactView or TestThis() one at a time works fine. Only when creating the two instances together does the crash occurs.

[harryterkelsen]

Thanks, I was able to repro the crash on my machine with the provided files. When I run in checked mode I get this crash:

test/test.dart:
Internal Error: The compiler crashed when compiling this element.

The compiler is broken.

When compiling the above element, the compiler crashed. It is not
possible to tell if this is caused by a problem in your program or
not. Regardless, the compiler should not crash.

The Dart team would greatly appreciate if you would take a moment to
report this problem at http://dartbug.com/new.

Please include the following information:

* the name and version of your operating system,

* the Dart SDK build number (build number could not be determined), and

* the entire message you see here (including the full stack trace
  below as well as the source location above).

The compiler crashed: 'file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js_emitter/metadata_collector.dart': Failed assertion: line 66 pos 13: 'isBound' is not true.
#0      _AssertionError._throwNew (dart:core-patch/errors_patch.dart:27)
#1      _ForwardingMetadataEntry.forwardTo (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js_emitter/metadata_collector.dart:66:13)
#2      _ForwardingMetadataEntry.markSeen (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js_emitter/metadata_collector.dart:82:42)
#3      TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:111:12)
#4      BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119:41)
#5      BaseVisitor.visitToken (package:js_ast/src/nodes.dart:150:39)
#6      BaseVisitor.visitDeferredNumber (package:js_ast/src/nodes.dart:153:49)
#7      DeferredNumber.accept (package:js_ast/src/nodes.dart:984:42)
#8      ArrayInitializer.visitChildren (package:js_ast/src/nodes.dart:1089:50)
#9      BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#10     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#11     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119:41)
#12     BaseVisitor.visitArrayInitializer (package:js_ast/src/nodes.dart:167:53)
#13     ArrayInitializer.accept (package:js_ast/src/nodes.dart:1086:42)
#14     _BoundMetadataEntry.markSeen (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js_emitter/metadata_collector.dart:47:25)
#15     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:111:12)
#16     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119:41)
#17     BaseVisitor.visitToken (package:js_ast/src/nodes.dart:150:39)
#18     BaseVisitor.visitDeferredNumber (package:js_ast/src/nodes.dart:153:49)
#19     DeferredNumber.accept (package:js_ast/src/nodes.dart:984:42)
#20     ArrayInitializer.visitChildren (package:js_ast/src/nodes.dart:1089:50)
#21     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#22     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#23     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119:41)
#24     BaseVisitor.visitArrayInitializer (package:js_ast/src/nodes.dart:167:53)
#25     ArrayInitializer.accept (package:js_ast/src/nodes.dart:1086:42)
#26     Property.visitChildren (package:js_ast/src/nodes.dart:1146:11)
#27     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#28     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#29     BaseVisitor.visitProperty (package:js_ast/src/nodes.dart:170:37)
#30     Property.accept (package:js_ast/src/nodes.dart:1142:42)
#31     ObjectInitializer.visitChildren (package:js_ast/src/nodes.dart:1127:44)
#32     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#33     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#34     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119:41)
#35     BaseVisitor.visitObjectInitializer (package:js_ast/src/nodes.dart:169:55)
#36     ObjectInitializer.accept (package:js_ast/src/nodes.dart:1124:42)
#37     ArrayInitializer.visitChildren (package:js_ast/src/nodes.dart:1089:50)
#38     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#39     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#40     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119:41)
#41     BaseVisitor.visitArrayInitializer (package:js_ast/src/nodes.dart:167:53)
#42     ArrayInitializer.accept (package:js_ast/src/nodes.dart:1086:42)
#43     ArrayInitializer.visitChildren (package:js_ast/src/nodes.dart:1089:50)
#44     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#45     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#46     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119:41)
#47     BaseVisitor.visitArrayInitializer (package:js_ast/src/nodes.dart:167:53)
#48     ArrayInitializer.accept (package:js_ast/src/nodes.dart:1086:42)
#49     Assignment.visitChildren (package:js_ast/src/nodes.dart:675:30)
#50     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#51     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#52     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119:41)
#53     BaseVisitor.visitAssignment (package:js_ast/src/nodes.dart:125:41)
#54     BaseVisitor.visitVariableInitialization (package:js_ast/src/nodes.dart:128:14)
#55     VariableInitialization.accept (package:js_ast/src/nodes.dart:689:42)
#56     VariableDeclarationList.visitChildren (package:js_ast/src/nodes.dart:648:19)
#57     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#58     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#59     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119:41)
#60     BaseVisitor.visitVariableDeclarationList (package:js_ast/src/nodes.dart:124:10)
#61     VariableDeclarationList.accept (package:js_ast/src/nodes.dart:644:42)
#62     ExpressionStatement.visitChildren (package:js_ast/src/nodes.dart:269:56)
#63     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#64     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#65     BaseVisitor.visitStatement (package:js_ast/src/nodes.dart:91:39)
#66     BaseVisitor.visitExpressionStatement (package:js_ast/src/nodes.dart:97:10)
#67     ExpressionStatement.accept (package:js_ast/src/nodes.dart:268:42)
#68     Block.visitChildren (package:js_ast/src/nodes.dart:257:55)
#69     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#70     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#71     BaseVisitor.visitStatement (package:js_ast/src/nodes.dart:91:39)
#72     BaseVisitor.visitBlock (package:js_ast/src/nodes.dart:95:31)
#73     Block.accept (package:js_ast/src/nodes.dart:255:42)
#74     Fun.visitChildren (package:js_ast/src/nodes.dart:917:10)
#75     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#76     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#77     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119:41)
#78     BaseVisitor.visitFun (package:js_ast/src/nodes.dart:148:27)
#79     Fun.accept (package:js_ast/src/nodes.dart:913:42)
#80     Call.visitChildren (package:js_ast/src/nodes.dart:727:12)
#81     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#82     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#83     BaseVisitor.visitExpression (package:js_ast/src/nodes.dart:119:41)
#84     BaseVisitor.visitCall (package:js_ast/src/nodes.dart:135:29)
#85     Call.accept (package:js_ast/src/nodes.dart:724:42)
#86     ExpressionStatement.visitChildren (package:js_ast/src/nodes.dart:269:56)
#87     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#88     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#89     BaseVisitor.visitStatement (package:js_ast/src/nodes.dart:91:39)
#90     BaseVisitor.visitExpressionStatement (package:js_ast/src/nodes.dart:97:10)
#91     ExpressionStatement.accept (package:js_ast/src/nodes.dart:268:42)
#92     Program.visitChildren (package:js_ast/src/nodes.dart:241:49)
#93     BaseVisitor.visitNode (package:js_ast/src/nodes.dart:85:10)
#94     TokenCounter.visitNode (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:113:22)
#95     BaseVisitor.visitProgram (package:js_ast/src/nodes.dart:89:35)
#96     Program.accept (package:js_ast/src/nodes.dart:239:42)
#97     TokenCounter.countTokens (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js/js.dart:117:39)
#98     Emitter.finalizeTokensInAst (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart:1768:13)
#99     Emitter.emitProgram (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart:1804:5)
#100    CodeEmitterTask.assembleProgram.<anonymous closure> (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart:146:26)
#101    CompilerTask.measure (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/common/tasks.dart:55:37)
#102    CodeEmitterTask.assembleProgram (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart:140:12)
#103    JavaScriptBackend.assembleProgram (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/js_backend/backend.dart:1570:31)
#104    Compiler.compileLoadedLibraries (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/compiler.dart:1054:31)
#105    Compiler.runCompiler.<anonymous closure> (file:///usr/local/google/home/het/code/dart/sdk/pkg/compiler/lib/src/compiler.dart:879:7)
#106    _RootZone.runUnary (dart:async/zone.dart:1149)
#107    _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:502)
#108    _Future._propagateToListeners (dart:async/future_impl.dart:585)
#109    _Future._completeWithValue (dart:async/future_impl.dart:376)
#110    _Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:430)
#111    _microtaskLoop (dart:async/schedule_microtask.dart:43)
#112    _microtaskLoopEntry (dart:async/schedule_microtask.dart:52)
#113    _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:96)
#114    _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:151)

[sigmundch]

most likely becuase mockito is marking everything as retained by mirrors, we might be hitting a corner case on the frequency namer.

@herhut-ggl - maybe you have a quick clue of what could be happening here? From what I could see this happens on a type variable for Point#T (defined both in that package under geom/point.dart and in dart:core).

@alextech - you might be able to work around this issue by using the @MirrorsUsed annotation and marking only your MockReactView class to be preserved by adding this to your test file:

@MirrorsUsed(targets: "MockReactView", override: "*")
import 'dart:mirrors';

[ghost]

I have a proposed fix in https://codereview.chromium.org/1394483002/.