1 files changed, 24 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Object-isArrowFunction.js b/js/src/jit-test/tests/debug/Object-isArrowFunction.js
new file mode 100644
index 0000000000..6d7bd531b6
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Object-isArrowFunction.js
@@ -0,0 +1,24 @@
+// Debugger.Object.prototype.isArrowFunction recognizes arrow functions.
+
+var g = newGlobal({newCompartment: true});
+var dbg = new Debugger;
+var gDO = dbg.addDebuggee(g);
+var hits = 0;
+
+function checkIsArrow(shouldBe, expr) {
+  print(expr);
+  assertEq(gDO.executeInGlobal(expr).return.isArrowFunction, shouldBe);
+}
+
+checkIsArrow(true, '() => { }');
+checkIsArrow(true, '(a) => { bleh; }');
+checkIsArrow(false, 'Object.getPrototypeOf(() => { })');
+checkIsArrow(false, '(function () { })');
+checkIsArrow(false, 'function f() { } f');
+checkIsArrow((void 0), '({})');
+checkIsArrow(false, 'Math.atan2');
+checkIsArrow(false, 'Function.prototype');
+checkIsArrow(false, 'Function("")');
+checkIsArrow(false, 'new Function("")');
+checkIsArrow(false, '(async function f () {})');
+checkIsArrow(true,  '(async () => { })');