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function assert_prop_desc_equals(object, property_key, expected) {
let actual = Object.getOwnPropertyDescriptor(object, property_key);
if (expected === undefined) {
assert_equals(
actual, undefined,
"(assert_prop_desc_equals: no property descriptor expected)");
return;
}
for (p in actual) {
assert_true(
expected.hasOwnProperty(p),
"(assert_prop_desc_equals: property '" + p + "' is not expected)");
assert_equals(
actual[p], expected[p],
"(assert_prop_desc_equals: property '" + p + "')");
}
for (p in expected) {
assert_true(
actual.hasOwnProperty(p),
"(assert_prop_desc_equals: expected property '" + p + "' missing)");
}
}