1 files changed, 53 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-older-generators-01.js b/js/src/jit-test/tests/debug/Frame-older-generators-01.js
new file mode 100644
index 0000000000..f79f485faf
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-older-generators-01.js
@@ -0,0 +1,53 @@
+// Generator/async frames can be created by following .older.
+//
+// The goal here is to get some test coverage creating generator Frame objects
+// at some time other than when firing onEnterFrame. Here they're created after
+// the initial yield.
+
+let g = newGlobal({newCompartment: true});
+g.eval(`
+    function f() {
+        debugger;
+    }
+    function* gen() {
+        f();
+        yield 1;
+        f();
+    }
+    function* genDefaults(x=f()) {
+        f();
+    }
+    async function af() {
+        f();
+        await 1;
+        f();
+    }
+    async function afDefaults(x=f()) {
+        await 1;
+        f();
+    }
+`);
+
+function test(expected, code) {
+    let dbg = Debugger(g);
+    let hits = 0;
+    let genFrame = null;
+    dbg.onDebuggerStatement = frame => {
+        hits++;
+        assertEq(frame.callee.name, "f");
+        if (genFrame === null) {
+            genFrame = frame.older;
+        } else {
+            assertEq(frame.older, genFrame);
+        }
+        assertEq(genFrame.callee.name, expected);
+    };
+    g.eval(code);
+    assertEq(hits, 2);
+    dbg.removeDebuggee(g);
+}
+
+test("gen", "for (var x of gen()) {}");
+test("genDefaults", "for (var x of genDefaults()) {}");
+test("af", "af(); drainJobQueue();");
+test("afDefaults", "afDefaults(); drainJobQueue();")