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diff --git a/dom/heapsnapshot/tests/gtest/DeserializedNodeUbiNodes.cpp b/dom/heapsnapshot/tests/gtest/DeserializedNodeUbiNodes.cpp
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+++ b/dom/heapsnapshot/tests/gtest/DeserializedNodeUbiNodes.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Test that the `JS::ubi::Node`s we create from
+// `mozilla::devtools::DeserializedNode` instances look and behave as we would
+// like.
+
+#include "DevTools.h"
+#include "js/TypeDecls.h"
+#include "mozilla/devtools/DeserializedNode.h"
+
+using testing::Field;
+using testing::ReturnRef;
+
+// A mock DeserializedNode for testing.
+struct MockDeserializedNode : public DeserializedNode
+{
+ MockDeserializedNode(NodeId id, const char16_t* typeName, uint64_t size)
+ : DeserializedNode(id, typeName, size)
+ { }
+
+ bool addEdge(DeserializedEdge&& edge)
+ {
+ return edges.append(Move(edge));
+ }
+
+ MOCK_METHOD1(getEdgeReferent, JS::ubi::Node(const DeserializedEdge&));
+};
+
+size_t fakeMallocSizeOf(const void*) {
+ EXPECT_TRUE(false);
+ MOZ_ASSERT_UNREACHABLE("fakeMallocSizeOf should never be called because "
+ "DeserializedNodes report the deserialized size.");
+ return 0;
+}
+
+DEF_TEST(DeserializedNodeUbiNodes, {
+ const char16_t* typeName = u"TestTypeName";
+ const char* className = "MyObjectClassName";
+ const char* filename = "my-cool-filename.js";
+
+ NodeId id = uint64_t(1) << 33;
+ uint64_t size = uint64_t(1) << 60;
+ MockDeserializedNode mocked(id, typeName, size);
+ mocked.coarseType = JS::ubi::CoarseType::Script;
+ mocked.jsObjectClassName = className;
+ mocked.scriptFilename = filename;
+
+ DeserializedNode& deserialized = mocked;
+ JS::ubi::Node ubi(&deserialized);
+
+ // Test the ubi::Node accessors.
+
+ EXPECT_EQ(size, ubi.size(fakeMallocSizeOf));
+ EXPECT_EQ(typeName, ubi.typeName());
+ EXPECT_EQ(JS::ubi::CoarseType::Script, ubi.coarseType());
+ EXPECT_EQ(id, ubi.identifier());
+ EXPECT_FALSE(ubi.isLive());
+ EXPECT_EQ(ubi.jsObjectClassName(), className);
+ EXPECT_EQ(ubi.scriptFilename(), filename);
+
+ // Test the ubi::Node's edges.
+
+ UniquePtr<DeserializedNode> referent1(new MockDeserializedNode(1,
+ nullptr,
+ 10));
+ DeserializedEdge edge1(referent1->id);
+ mocked.addEdge(Move(edge1));
+ EXPECT_CALL(mocked, getEdgeReferent(EdgeTo(referent1->id)))
+ .Times(1)
+ .WillOnce(Return(JS::ubi::Node(referent1.get())));
+
+ UniquePtr<DeserializedNode> referent2(new MockDeserializedNode(2,
+ nullptr,
+ 20));
+ DeserializedEdge edge2(referent2->id);
+ mocked.addEdge(Move(edge2));
+ EXPECT_CALL(mocked, getEdgeReferent(EdgeTo(referent2->id)))
+ .Times(1)
+ .WillOnce(Return(JS::ubi::Node(referent2.get())));
+
+ UniquePtr<DeserializedNode> referent3(new MockDeserializedNode(3,
+ nullptr,
+ 30));
+ DeserializedEdge edge3(referent3->id);
+ mocked.addEdge(Move(edge3));
+ EXPECT_CALL(mocked, getEdgeReferent(EdgeTo(referent3->id)))
+ .Times(1)
+ .WillOnce(Return(JS::ubi::Node(referent3.get())));
+
+ auto range = ubi.edges(cx);
+ ASSERT_TRUE(!!range);
+
+ for ( ; !range->empty(); range->popFront()) {
+ // Nothing to do here. This loop ensures that we get each edge referent
+ // that we expect above.
+ }
+ });