Use the stack_trace library in scheduled_test.

pkg/scheduled_test/lib/src/schedule_error.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library schedule_error;
 
 import 'dart:async';
 
+import 'package:stack_trace/stack_trace.dart';
+
 import 'schedule.dart';
 import 'task.dart';
 import 'utils.dart';
 
 /// A wrapper for errors that occur during a scheduled test.
 class ScheduleError extends AsyncError {
   /// The schedule during which this error occurred.
   final Schedule schedule;
 
   /// The task that was running when this error occurred. This may be `null` if
@@ skipping 10 matching lines @@
 
   /// The state of the schedule at the time the error was detected.
   final ScheduleState _stateWhenDetected;
 
   int get hashCode => schedule.hashCode ^ task.hashCode ^ queue.hashCode ^
       _stateWhenDetected.hashCode ^ error.hashCode ^ stackTrace.hashCode ^
       cause.hashCode;
 
   /// Creates a new [ScheduleError] wrapping [error]. The metadata in
   /// [AsyncError]s and [ScheduleError]s will be preserved.
-  factory ScheduleError.from(Schedule schedule, error, {stackTrace,
+  factory ScheduleError.from(Schedule schedule, error, {StackTrace stackTrace,
       AsyncError cause}) {
     if (error is ScheduleError) return error;
 
     if (error is AsyncError) {
       // Overwrite the explicit stack trace, because it probably came from a
       // rethrow in the first place.
       stackTrace = error.stackTrace;
       if (cause == null) cause = error.cause;
       error = error.error;
     }
 
     if (stackTrace == null) {
       try {
         throw '';
       } catch (_, thrownStackTrace) {
         stackTrace = thrownStackTrace;
       }
     }
 
     return new ScheduleError(schedule, error, stackTrace, cause);
   }
 
-  ScheduleError(Schedule schedule, error, stackTrace, AsyncError cause)
+  ScheduleError(Schedule schedule, error, StackTrace stackTrace,
+      AsyncError cause)
       : super.withCause(error, stackTrace, cause),
         schedule = schedule,
         task = schedule.currentTask,
         queue = schedule.currentQueue,
         pendingCallbacks = schedule.currentQueue == null ? <String>[]
             : schedule.currentQueue.pendingCallbacks.toList(),
         _stateWhenDetected = schedule.state;
 
   bool operator ==(other) => other is ScheduleError && task == other.task &&
       queue == other.queue && _stateWhenDetected == other._stateWhenDetected &&
       error == other.error && stackTrace == other.stackTrace &&
       cause == other.cause;
 
   String toString() {
     var result = new StringBuffer();
 
     var errorString = error.toString();
     if (errorString.contains("\n")) {
       result.write('ScheduleError:\n');
       result.write(prefixLines(errorString.trim()));
       result.write("\n\n");
     } else {
       result.write('ScheduleError: "$errorString"\n');
     }
 
     result.write('Stack trace:\n');
-    result.write(prefixLines(stackTrace.toString().trim()));
+    result.write(prefixLines(terseTraceString(stackTrace)));
     result.write("\n\n");
 
     if (task != null) {
       result.write('Error detected during task in queue "$queue":\n');
       result.write(task.generateTree());
     } else if (_stateWhenDetected == ScheduleState.DONE) {
       result.write('Error detected after all tasks in the schedule had '
           'finished.');
     } else if (_stateWhenDetected == ScheduleState.RUNNING) {
       result.write('Error detected when waiting for out-of-band callbacks in '
           'queue "$queue".');
     } else { // _stateWhenDetected == ScheduleState.SET_UP
       result.write('Error detected before the schedule started running.');
     }
 
     if (!pendingCallbacks.isEmpty) {
       result.write("\n\n");
       result.writeln("Pending out-of-band callbacks:");
       for (var callback in pendingCallbacks) {
-        result.writeln("* $callback");
+        result.writeln(prefixLines(callback, firstPrefix: "* "));
       }
     }
 
     return result.toString().trim();
   }
 }