Allow Suites to be added to an Engine over time.

lib/src/utils.dart

Index: lib/src/utils.dart
diff --git a/lib/src/utils.dart b/lib/src/utils.dart
index c5fd4333bc038e0042833562112b64a3147c1f9c..07d7df5dbb058d61ece4d91241c7d007f1183f4c 100644
--- a/lib/src/utils.dart
+++ b/lib/src/utils.dart
@@ -5,6 +5,7 @@
 library test.utils;
 
 import 'dart:async';
+import 'dart:convert';
 import 'dart:math' as math;
 
 import 'package:crypto/crypto.dart';
@@ -23,6 +24,9 @@ typedef AsyncFunction();
 /// A typedef for a zero-argument callback function.
 typedef void Callback();
 
+/// A converter that decodes bytes using UTF-8 and splits them on newlines.
+final lineSplitter = UTF8.decoder.fuse(const LineSplitter());
+
 /// A regular expression to match the exception prefix that some exceptions'
 /// [Object.toString] values contain.
 final _exceptionPrefix = new RegExp(r'^([A-Z][a-zA-Z]*)?(Exception|Error): ');