Sharing metatest logic between unittest and scheduled_test

pkg/metatest/lib/src/utils.dart

Index: pkg/metatest/lib/src/utils.dart
diff --git a/pkg/metatest/lib/src/utils.dart b/pkg/metatest/lib/src/utils.dart
new file mode 100644
index 0000000000000000000000000000000000000000..542f28944f6c3bd6cf106fdc62483309a8a209ff
--- /dev/null
+++ b/pkg/metatest/lib/src/utils.dart
@@ -0,0 +1,19 @@
+// Copyright (c) 2014, 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 metatest.utils;
+
+/// Prepends each line in [text] with [prefix]. If [firstPrefix] is passed, the
+/// first line is prefixed with that instead.
+String prefixLines(String text, {String prefix: '| ', String firstPrefix}) {
+  var lines = text.split('\n');
+  if (firstPrefix == null) {
+    return lines.map((line) => '$prefix$line').join('\n');
+  }
+
+  var firstLine = "$firstPrefix${lines.first}";
+  lines = lines.skip(1).map((line) => '$prefix$line').toList();
+  lines.insert(0, firstLine);
+  return lines.join('\n');
+}