Refactor the pub tests.

lib/unittest/config.dart

Index: lib/unittest/config.dart
diff --git a/lib/unittest/config.dart b/lib/unittest/config.dart
index c0a2f78daddb6cc67c700d16e4233caa3121c5e7..19560de956054ed58d40b81d0e95a26b9a8998c5 100644
--- a/lib/unittest/config.dart
+++ b/lib/unittest/config.dart
@@ -46,7 +46,11 @@ class Configuration {
       print('${t.result.toUpperCase()}: ${t.description}');
 
       if (t.message != '') {
-        print('  ${t.message}');
+        print(_indent(t.message));
+      }
+
+      if (t.stackTrace != null && t.stackTrace != '') {
+        print(_indent(t.stackTrace));
       }
     }
 
@@ -71,4 +75,11 @@ class Configuration {
     // An exception is used by the test infrastructure to detect failure.
     if (!success) throw new Exception("Some tests failed.");
   }
+
+  String _indent(String str) {
+    // TODO(nweiz): Use this simpler code once issue 2980 is fixed.
+    // return str.replaceAll(const RegExp("^", multiLine: true), "  ");
+
+    return Strings.join(str.split("\n").map((line) => "  $line"), "\n");
+  }
 }