1 files changed, 54 insertions, 0 deletions
diff --git a/devtools/shared/heapsnapshot/tests/xpcshell/dominator-tree-worker.js b/devtools/shared/heapsnapshot/tests/xpcshell/dominator-tree-worker.js
new file mode 100644
index 0000000000..c636226101
--- /dev/null
+++ b/devtools/shared/heapsnapshot/tests/xpcshell/dominator-tree-worker.js
@@ -0,0 +1,54 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* eslint-env worker */
+
+"use strict";
+
+console.log("Initializing worker.");
+
+self.onmessage = e => {
+  console.log("Starting test.");
+  try {
+    const path = ChromeUtils.saveHeapSnapshot({ runtime: true });
+    const snapshot = ChromeUtils.readHeapSnapshot(path);
+
+    const dominatorTree = snapshot.computeDominatorTree();
+    ok(dominatorTree);
+    ok(DominatorTree.isInstance(dominatorTree));
+
+    let threw = false;
+    try {
+      new DominatorTree();
+    } catch (excp) {
+      threw = true;
+    }
+    ok(threw, "Constructor shouldn't be usable");
+  } catch (ex) {
+    ok(
+      false,
+      "Unexpected error inside worker:\n" + ex.toString() + "\n" + ex.stack
+    );
+  } finally {
+    done();
+  }
+};
+
+// Proxy assertions to the main thread.
+function ok(val, msg) {
+  console.log("ok(" + !!val + ', "' + msg + '")');
+  self.postMessage({
+    type: "assertion",
+    passed: !!val,
+    msg,
+    stack: Error().stack,
+  });
+}
+
+// Tell the main thread we are done with the tests.
+function done() {
+  console.log("done()");
+  self.postMessage({
+    type: "done",
+  });
+}