Add a flag controlling how verbose stack traces are.

lib/src/utils.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 test.utils;
 
 import 'dart:async';
 import 'dart:math' as math;
 
 import 'package:crypto/crypto.dart';
@@ skipping 70 matching lines @@
 
 /// A regular expression matching the path to a temporary file used to start an
 /// isolate.
 ///
 /// These paths aren't relevant and are removed from stack traces.
 final _isolatePath =
     new RegExp(r"/test_[A-Za-z0-9]{6}/runInIsolate\.dart$");
 
 /// Returns [stackTrace] converted to a [Chain] with all irrelevant frames
 /// folded together.
-Chain terseChain(StackTrace stackTrace) {
+///
+/// If [verbose] is `true`, returns the chain for [stackTrace] unmodified.
+Chain terseChain(StackTrace stackTrace, {bool verbose: false}) {
+  if (verbose) return new Chain.forTrace(stackTrace);
   return new Chain.forTrace(stackTrace).foldFrames((frame) {
     if (frame.package == 'test') return true;
 
     // Filter out frames from our isolate bootstrap as well.
     if (frame.uri.scheme != 'file') return false;
     return frame.uri.path.contains(_isolatePath);
   }, terse: true);
 }
 
 /// Flattens nested [Iterable]s inside an [Iterable] into a single [List]
@@ skipping 212 matching lines @@
   }
 }
 
 /// Returns middleware that nests all requests beneath the URL prefix [beneath].
 shelf.Middleware nestingMiddleware(String beneath) {
   return (handler) {
     var pathHandler = new PathHandler()..add(beneath, handler);
     return pathHandler.handler;
   };
 }