1 files changed, 85 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webidl/ecmascript-binding/global-object-implicit-this-value.any.js b/testing/web-platform/tests/webidl/ecmascript-binding/global-object-implicit-this-value.any.js
new file mode 100644
index 0000000000..4c159c6751
--- /dev/null
+++ b/testing/web-platform/tests/webidl/ecmascript-binding/global-object-implicit-this-value.any.js
@@ -0,0 +1,85 @@
+// META: global=window,worker
+
+// https://webidl.spec.whatwg.org/#dfn-attribute-getter (step 1.1.2.1)
+// https://webidl.spec.whatwg.org/#dfn-attribute-setter (step 4.5.1)
+// https://webidl.spec.whatwg.org/#dfn-create-operation-function (step 2.1.2.1)
+
+const notGlobalObject = Object.create(Object.getPrototypeOf(globalThis));
+
+test(() => {
+    assert_throws_js(TypeError, () => { Object.create(globalThis).self; });
+    assert_throws_js(TypeError, () => { getGlobalPropertyDescriptor("location").get.call(notGlobalObject); });
+    assert_throws_js(TypeError, () => { Reflect.get(globalThis, "navigator", notGlobalObject); });
+    assert_throws_js(TypeError, () => { new Proxy(globalThis, {}).onerror; });
+}, "Global object's getter throws when called on incompatible object");
+
+test(() => {
+    assert_throws_js(TypeError, () => { Object.create(globalThis).origin = origin; });
+    assert_throws_js(TypeError, () => { getGlobalPropertyDescriptor("onerror").set.call(notGlobalObject, onerror); });
+    assert_throws_js(TypeError, () => { Reflect.set(globalThis, "onoffline", onoffline, notGlobalObject); });
+    assert_throws_js(TypeError, () => { new Proxy(globalThis, {}).ononline = ononline; });
+}, "Global object's setter throws when called on incompatible object");
+
+test(() => {
+    assert_throws_js(TypeError, () => { Object.create(globalThis).setInterval(() => {}, 100); });
+    assert_throws_js(TypeError, () => { clearTimeout.call(notGlobalObject, () => {}); });
+    assert_throws_js(TypeError, () => { Reflect.apply(btoa, notGlobalObject, [""]); });
+    assert_throws_js(TypeError, () => { new Proxy(globalThis, {}).removeEventListener("foo", () => {}); });
+}, "Global object's operation throws when called on incompatible object");
+
+if (typeof document !== "undefined") {
+    test(() => {
+        assert_throws_js(TypeError, () => { Object.getOwnPropertyDescriptor(window, "document").get.call(document.all); });
+    }, "Global object's getter throws when called on incompatible object (document.all)");
+
+    test(() => {
+        assert_throws_js(TypeError, () => { Object.getOwnPropertyDescriptor(window, "name").set.call(document.all); });
+    }, "Global object's setter throws when called on incompatible object (document.all)");
+
+    test(() => {
+        assert_throws_js(TypeError, () => { focus.call(document.all); });
+    }, "Global object's operation throws when called on incompatible object (document.all)");
+}
+
+// An engine might have different code path for calling a function from outer scope to implement step 1.b.iii of https://tc39.es/ecma262/#sec-evaluatecall
+const locationGetter = getGlobalPropertyDescriptor("location").get;
+test(() => {
+    assert_equals(getGlobalPropertyDescriptor("self").get.call(null), self);
+    assert_equals((() => locationGetter())(), location);
+    assert_equals(Reflect.get(globalThis, "origin", null), origin);
+    assert_equals(Reflect.get(globalThis, "onoffline", undefined), onoffline);
+}, "Global object's getter works when called on null / undefined");
+
+test(() => {
+    const fn = () => {};
+
+    // origin is [Replaceable]
+    getGlobalPropertyDescriptor("origin").set.call(null, "foo");
+    assert_equals(origin, "foo");
+    getGlobalPropertyDescriptor("onerror").set.call(undefined, fn);
+    assert_equals(onerror, fn);
+    assert_true(Reflect.set(globalThis, "onoffline", fn, null));
+    assert_equals(onoffline, fn);
+
+    const ononlineSetter = getGlobalPropertyDescriptor("ononline").set;
+    (() => { ononlineSetter(fn); })();
+    assert_equals(ononline, fn);
+}, "Global object's setter works when called on null / undefined");
+
+// An engine might have different code path for calling a function from outer scope to implement step 1.b.iii of https://tc39.es/ecma262/#sec-evaluatecall
+const __addEventListener = addEventListener;
+test(() => {
+    assert_equals(atob.call(null, ""), "");
+    assert_equals(typeof (0, setInterval)(() => {}, 100), "number");
+
+    (() => { __addEventListener("foo", event => { event.preventDefault(); }); })();
+    const __dispatchEvent = dispatchEvent;
+    (() => { assert_false(__dispatchEvent(new Event("foo", { cancelable: true }))); })();
+}, "Global object's operation works when called on null / undefined");
+
+function getGlobalPropertyDescriptor(key) {
+    for (let obj = globalThis; obj; obj = Object.getPrototypeOf(obj)) {
+        const desc = Object.getOwnPropertyDescriptor(obj, key);
+        if (desc) return desc;
+    }
+}