Incoming references service request and UI.

runtime/bin/vmservice/observatory/test/inbound_references_test.dart

Index: runtime/bin/vmservice/observatory/test/inbound_references_test.dart
diff --git a/runtime/bin/vmservice/observatory/test/inbound_references_test.dart b/runtime/bin/vmservice/observatory/test/inbound_references_test.dart
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index 0000000000000000000000000000000000000000..1d1f460ac99e90211d9c96df721544722fe2657f
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+++ b/runtime/bin/vmservice/observatory/test/inbound_references_test.dart
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+// 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 inbound_references_test;
+
+import 'dart:async' show Future;
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+import 'test_helper.dart';
+
+class Node {
+  var edge;
+}
+
+class Edge { }
+
+var n, e, array;
+
+void script() {
+  n = new Node();
+  e = new Edge();
+  n.edge = e;
+  array = new List(2);
+  array[0] = n;
+  array[1] = e;
+}
+
+var tests = [
+
+(Isolate isolate) =>
+  isolate.rootLib.load().then((Library lib) {
+    ServiceMap e = lib.variables.where((v) => v.name == 'e').single['value'];
+    var id = e['id'];
+    return isolate.get('/$id/inbound_references?limit=100').then(
+        (ServiceMap response) {
+          List references = response['references'];
+          hasReferenceSuchThat(predicate) {
+            expect(references.any(predicate), isTrue);
+          }
+
+          // Assert e is referenced by at least n, array, and the top-level
+          // field e.
+          hasReferenceSuchThat((r) => r['slot'] is Map &&
+                                      r['slot']['type']=='@Field' &&
+                                      r['slot']['name']=='edge' &&
+                                      r['source']['type']=='@Instance' &&
+                                      r['source']['class'].name=='Node');
+          hasReferenceSuchThat((r) => r['slot']==1 &&
+                                      r['source']['type']=='@Array');
+          hasReferenceSuchThat((r) => r['slot']=='<unknown>' &&
+                                      r['source']['type']=='@Field');
+    });
+}),
+
+];
+
+main(args) => runIsolateTests(args, tests, testeeBefore: script);