1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Object-getOwnPropertyNamesLength.js b/js/src/jit-test/tests/debug/Object-getOwnPropertyNamesLength.js
new file mode 100644
index 0000000000..0fe3ced1ba
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Object-getOwnPropertyNamesLength.js
@@ -0,0 +1,41 @@
+// Basic getOwnPropertyNamesLength tests.
+
+var g = newGlobal({ newCompartment: true });
+var dbg = Debugger();
+var gobj = dbg.addDebuggee(g);
+
+function testGetOwnPropertyLength(code) {
+  code = `(${code});`;
+  const expected = Object.getOwnPropertyNames(eval(code)).length;
+  g.eval(`obj =  ${code}`);
+  const length = gobj
+    .getOwnPropertyDescriptor("obj")
+    .value.getOwnPropertyNamesLength();
+  assertEq(length, expected, `Expected result for: ${code}`);
+}
+
+testGetOwnPropertyLength("{}");
+testGetOwnPropertyLength("{a: 0, b: 1}");
+testGetOwnPropertyLength("{'name with space': 0}");
+testGetOwnPropertyLength("{get x() {}, set y(v) {}}");
+testGetOwnPropertyLength("{get x() { throw 'fit'; }}");
+testGetOwnPropertyLength("Object.create({a: 1})");
+testGetOwnPropertyLength("Object.create({get a() {}, set a(v) {}})");
+testGetOwnPropertyLength(
+  "(function () { var x = {a: 0, b: 1}; delete a; return x; })()"
+);
+testGetOwnPropertyLength("Object.create(null, {x: {value: 0}})");
+testGetOwnPropertyLength("[]");
+testGetOwnPropertyLength("[0, 1, 2]");
+testGetOwnPropertyLength("[,,,,,]");
+testGetOwnPropertyLength("/a*a/");
+testGetOwnPropertyLength("function () {}");
+testGetOwnPropertyLength(
+  `(function () {
+      var x = {};
+      x[Symbol()] = 1; 
+      x[Symbol.for('moon')] = 2; 
+      x[Symbol.iterator] = 3;
+      return x;
+    })()`
+);