1 files changed, 34 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-this-15.js b/js/src/jit-test/tests/debug/Frame-this-15.js
new file mode 100644
index 0000000000..350fa508a9
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-this-15.js
@@ -0,0 +1,34 @@
+// Test that Debugger.Frame.prototype.this works on a suspended async
+// function.
+
+load(libdir + "asserts.js");
+
+const g = newGlobal({ newCompartment: true });
+const dbg = new Debugger();
+const gDO = dbg.addDebuggee(g);
+
+g.eval(`
+var context = {};
+var f = async function() {
+  await Promise.resolve();
+  return this;
+}.bind(context);
+`);
+
+let frame;
+dbg.onEnterFrame = f => {
+  frame = f;
+  assertEq(frame.this, gDO.makeDebuggeeValue(g.context));
+  dbg.onEnterFrame = undefined;
+};
+
+(async () => {
+  const promise = g.f();
+
+  assertEq(!!frame, true);
+  assertEq(frame.this, gDO.makeDebuggeeValue(g.context));
+
+  await promise;
+
+  assertThrowsInstanceOf(() => frame.this, Error);
+})();