Support nested matchers in deep equality matching.

pkg/unittest/lib/src/pretty_print.dart

Index: pkg/unittest/lib/src/pretty_print.dart
diff --git a/pkg/unittest/lib/src/pretty_print.dart b/pkg/unittest/lib/src/pretty_print.dart
index 14a0bb1f44c1f03d9847ddc88fcb2caa7fb6da82..a748ec356a7028b0e24288285ea75d4079a66eb7 100644
--- a/pkg/unittest/lib/src/pretty_print.dart
+++ b/pkg/unittest/lib/src/pretty_print.dart
@@ -4,6 +4,7 @@
 
 library unittest.pretty_print;
 
+import '../matcher.dart';

[Siggi Cherem (dart-lang), 2014/02/28 02:41:04]

use package: ?

[Bob Nystrom, 2014/02/28 17:31:24]

Do you think that's better? It seems a bit weird to do that when the next line
doesn't.

[Siggi Cherem (dart-lang), 2014/02/28 17:37:19]

Not really.

I think in general is a bad idea to use '../'. I feel that generally people have
a good understanding of what's deeper inside a package, but not so much of
what's above it.

 import 'utils.dart';
 
 /**
@@ -19,6 +20,13 @@ import 'utils.dart';
  */
 String prettyPrint(object, {int maxLineLength, int maxItems}) {
   String _prettyPrint(object, int indent, Set seen, bool top) {
+    // If the object is a matcher, use its description.
+    if (object is Matcher) {
+      var description = new StringDescription();
+      object.describe(description);
+      return "<$description>";
+    }
+
     // Avoid looping infinitely on recursively-nested data structures.
     if (seen.contains(object)) return "(recursive)";
     seen = seen.union(new Set.from([object]));