1 files changed, 49 insertions, 0 deletions
diff --git a/devtools/shared/tests/xpcshell/test_stack.js b/devtools/shared/tests/xpcshell/test_stack.js
new file mode 100644
index 0000000000..a95d28c57d
--- /dev/null
+++ b/devtools/shared/tests/xpcshell/test_stack.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test stack.js.
+
+function run_test() {
+  const loader = new DevToolsLoader();
+  const require = loader.require;
+
+  const {
+    StackFrameCache,
+  } = require("resource://devtools/server/actors/utils/stack.js");
+
+  const cache = new StackFrameCache();
+  cache.initFrames();
+  const baseFrame = {
+    line: 23,
+    column: 77,
+    source: "nowhere",
+    functionDisplayName: "nobody",
+    parent: null,
+    asyncParent: null,
+    asyncCause: null,
+  };
+  cache.addFrame(baseFrame);
+
+  let event = cache.makeEvent();
+  Assert.equal(event[0], null);
+  Assert.equal(event[1].functionDisplayName, "nobody");
+  Assert.equal(event.length, 2);
+
+  cache.addFrame({
+    line: 24,
+    column: 78,
+    source: "nowhere",
+    functionDisplayName: "still nobody",
+    parent: null,
+    asyncParent: baseFrame,
+    asyncCause: "async",
+  });
+
+  event = cache.makeEvent();
+  Assert.equal(event[0].functionDisplayName, "still nobody");
+  Assert.equal(event[0].parent, 0);
+  Assert.equal(event[0].asyncParent, 1);
+  Assert.equal(event.length, 1);
+}