1 files changed, 22 insertions, 0 deletions
diff --git a/devtools/shared/heapsnapshot/tests/xpcshell/test_DominatorTree_03.js b/devtools/shared/heapsnapshot/tests/xpcshell/test_DominatorTree_03.js
new file mode 100644
index 0000000000..d304845328
--- /dev/null
+++ b/devtools/shared/heapsnapshot/tests/xpcshell/test_DominatorTree_03.js
@@ -0,0 +1,22 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+// Test that we can get the root of dominator trees.
+
+function run_test() {
+  const dominatorTree = saveHeapSnapshotAndComputeDominatorTree();
+  equal(typeof dominatorTree.root, "number", "root should be a number");
+  equal(
+    Math.floor(dominatorTree.root),
+    dominatorTree.root,
+    "root should be an integer"
+  );
+  Assert.greaterOrEqual(dominatorTree.root, 0, "root should be positive");
+  Assert.lessOrEqual(
+    dominatorTree.root,
+    Math.pow(2, 48),
+    "root should be less than or equal to 2^48"
+  );
+  do_test_finished();
+}