1 files changed, 100 insertions, 0 deletions
diff --git a/dom/heapsnapshot/tests/gtest/DeserializedNodeUbiNodes.cpp b/dom/heapsnapshot/tests/gtest/DeserializedNodeUbiNodes.cpp
new file mode 100644
index 000000000..e236a0acf
--- /dev/null
+++ b/dom/heapsnapshot/tests/gtest/DeserializedNodeUbiNodes.cpp
@@ -0,0 +1,100 @@
+/* -*-  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.
+    }
+  });