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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /html/browsers/the-window-object/proxy-getOwnPropertyDescriptor.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>getOwnPropertyDescriptor() is correct for Proxy with host object target</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
'use strict';
const assert_accessor_descriptor_equals = (actual, expected) => {
assert_equals(actual.get, expected.get, 'get');
assert_equals(actual.set, expected.set, 'set');
assert_equals(actual.enumerable, expected.enumerable, 'enumerable');
assert_equals(actual.configurable, expected.configurable, 'configurable');
};
const assert_data_descriptor_equals = (actual, expected) => {
assert_equals(actual.value, expected.value, 'value');
assert_equals(actual.writable, expected.writable, 'writable');
assert_equals(actual.enumerable, expected.enumerable, 'enumerable');
assert_equals(actual.configurable, expected.configurable, 'configurable');
};
test(() => {
const windowProxy = new Proxy(window, {});
name = 'old_name';
const descriptor = Object.getOwnPropertyDescriptor(windowProxy, 'name');
assert_equals(descriptor.get.call(window), 'old_name');
descriptor.set.call(window, 'new_name');
assert_equals(name, 'new_name');
assert_true(descriptor.enumerable);
assert_true(descriptor.configurable);
}, 'Window target, no trap, "name" attribute');
test(() => {
let trapCalls = 0;
const windowProxy = new Proxy(window, {
getOwnPropertyDescriptor(...args) {
trapCalls++;
return Reflect.getOwnPropertyDescriptor(...args);
},
});
assert_accessor_descriptor_equals(
Object.getOwnPropertyDescriptor(windowProxy, 'document'),
Object.getOwnPropertyDescriptor(window, 'document')
);
assert_equals(trapCalls, 1);
}, 'Window target, forwarding trap, [LegacyUnforgeable] "document" attribute');
test(() => {
const trapResult = {get() {}, set(_val) {}, enumerable: false, configurable: true};
const windowProxy = new Proxy(new Proxy(window, {}), {
getOwnPropertyDescriptor: () => trapResult,
});
assert_accessor_descriptor_equals(
Object.getOwnPropertyDescriptor(windowProxy, 'onclick'),
trapResult
);
}, 'Window proxy target, custom trap, "onclick" event handler attribute');
test(() => {
let trapCalls = 0;
const documentProxy = new Proxy(document, {
getOwnPropertyDescriptor(...args) {
trapCalls++;
return Reflect.getOwnPropertyDescriptor(...args);
},
});
assert_accessor_descriptor_equals(
Object.getOwnPropertyDescriptor(documentProxy, 'location'),
Object.getOwnPropertyDescriptor(document, 'location')
);
assert_equals(trapCalls, 1);
}, 'Document target, forwarding trap, [LegacyUnforgeable] "location" attribute');
test(() => {
const trapResult = {value: 4, writable: false, enumerable: true, configurable: true};
const documentProxy = new Proxy(new Proxy(document, {}), {
getOwnPropertyDescriptor: () => trapResult,
});
assert_data_descriptor_equals(
Object.getOwnPropertyDescriptor(documentProxy, 'foo'),
trapResult
);
}, 'Document proxy target, custom trap, non-existent value attribute');
test(() => {
const locationProxy = new Proxy(location, {});
location.hash = '#old';
const descriptor = Object.getOwnPropertyDescriptor(locationProxy, 'hash');
assert_equals(descriptor.get.call(location), '#old');
descriptor.set.call(location, '#new');
assert_equals(location.hash, '#new');
assert_true(descriptor.enumerable);
assert_false(descriptor.configurable);
}, 'Location target, no trap, [LegacyUnforgeable] "hash" attribute');
test(() => {
let trapCalls = 0;
const locationProxy = new Proxy(new Proxy(location, {}), {
getOwnPropertyDescriptor(...args) {
trapCalls++;
return Reflect.getOwnPropertyDescriptor(...args);
},
});
assert_data_descriptor_equals(
Object.getOwnPropertyDescriptor(locationProxy, 'reload'),
Object.getOwnPropertyDescriptor(location, 'reload')
);
assert_equals(trapCalls, 1);
}, 'Location proxy target, forwarding trap, [LegacyUnforgeable] "reload" method');
</script>
</body>
</html>