Replace the existing unittest APIs with the new runner infrastructure.

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 unittest.utils;
 
 import 'dart:async';
 
 import 'package:stack_trace/stack_trace.dart';
 
@@ skipping 10 matching lines @@
 ///
 /// Many exceptions include the exception class name at the beginning of their
 /// [toString], so we remove that if it exists.
 String getErrorMessage(error) =>
   error.toString().replaceFirst(_exceptionPrefix, '');
 
 /// Indent each line in [str] by two spaces.
 String indent(String str) =>
     str.replaceAll(new RegExp("^", multiLine: true), "  ");
 
-/// A pair of values.
-class Pair<E, F> {
-  final E first;
-  final F last;
-
-  Pair(this.first, this.last);
-
-  String toString() => '($first, $last)';
-
-  bool operator ==(other) {
-    if (other is! Pair) return false;
-    return other.first == first && other.last == last;
-  }
-
-  int get hashCode => first.hashCode ^ last.hashCode;
-}
-
 /// A regular expression matching the path to a temporary file used to start an
 /// isolate.
 ///
 /// These paths aren't relevant and are removed from stack traces.
 final _isolatePath =
     new RegExp(r"/unittest_[A-Za-z0-9]{6}/runInIsolate\.dart$");
 
 /// Returns [stackTrace] converted to a [Chain] with all irrelevant frames
 /// folded together.
 Chain terseChain(StackTrace stackTrace) {
   return new Chain.forTrace(stackTrace).foldFrames((frame) {
     if (frame.package == 'unittest') 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);
 }
 
-/// Returns a Trace object from a StackTrace object or a String, or the
-/// unchanged input if formatStacks is false;
-Trace getTrace(stack, bool formatStacks, bool filterStacks) {
-  Trace trace;
-  if (stack == null || !formatStacks) return null;
-  if (stack is String) {
-    trace = new Trace.parse(stack);
-  } else if (stack is StackTrace) {
-    trace = new Trace.from(stack);
-  } else {
-    throw new Exception('Invalid stack type ${stack.runtimeType} for $stack.');
-  }
-
-  if (!filterStacks) return trace;
-
-  // Format the stack trace by removing everything above TestCase._runTest,
-  // which is usually going to be irrelevant. Also fold together unittest and
-  // core library calls so only the function the user called is visible.
-  return new Trace(trace.frames.takeWhile((frame) {
-    return frame.package != 'unittest' || frame.member != 'TestCase._runTest';
-  })).terse.foldFrames((frame) => frame.package == 'unittest' || frame.isCore);
-}
-
 /// Flattens nested [Iterable]s inside an [Iterable] into a single [List]
 /// containing only non-[Iterable] elements.
 List flatten(Iterable nested) {
   var result = [];
   helper(iter) {
     for (var element in iter) {
       if (element is Iterable) {
         helper(element);
       } else {
         result.add(element);
       }
     }
   }
   helper(nested);
   return result;
 }