51 lines
1.3 KiB
TypeScript
51 lines
1.3 KiB
TypeScript
|
// Copyright 2020 Signal Messenger, LLC
|
||
|
|
// SPDX-License-Identifier: AGPL-3.0-only
|
||
|
|
|
||
|
|
import { assert } from 'chai';
|
||
|
|
|
||
|
|
import { getOwn } from '../../util/getOwn';
|
||
|
|
|
||
|
|
describe('getOwn', () => {
|
||
|
|
class Person {
|
||
|
|
public birthYear: number;
|
||
|
|
|
||
|
|
constructor(birthYear: number) {
|
||
|
|
this.birthYear = birthYear;
|
||
|
|
}
|
||
|
|
|
||
|
|
getAge() {
|
||
|
|
return new Date().getFullYear() - this.birthYear;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
it('returns undefined when asking for a non-existent property', () => {
|
||
|
|
const obj: Record<string, number> = { bar: 123 };
|
||
|
|
assert.isUndefined(getOwn(obj, 'foo'));
|
||
|
|
});
|
||
|
|
|
||
|
|
it('returns undefined when asking for a non-own property', () => {
|
||
|
|
const obj: Record<string, number> = { bar: 123 };
|
||
|
|
assert.isUndefined(getOwn(obj, 'hasOwnProperty'));
|
||
|
|
|
||
|
|
const person = new Person(1880);
|
||
|
|
assert.isUndefined(getOwn(person, 'getAge'));
|
||
|
|
});
|
||
|
|
|
||
|
|
it('returns own properties', () => {
|
||
|
|
const obj: Record<string, number> = { foo: 123 };
|
||
|
|
assert.strictEqual(getOwn(obj, 'foo'), 123);
|
||
|
|
|
||
|
|
const person = new Person(1880);
|
||
|
|
assert.strictEqual(getOwn(person, 'birthYear'), 1880);
|
||
|
|
});
|
||
|
|
|
||
|
|
it('works even if `hasOwnProperty` has been overridden for the object', () => {
|
||
|
|
const obj: Record<string, unknown> = {
|
||
|
|
foo: 123,
|
||
|
|
hasOwnProperty: () => true,
|
||
|
|
};
|
||
|
|
assert.strictEqual(getOwn(obj, 'foo'), 123);
|
||
|
|
assert.isUndefined(getOwn(obj, 'bar'));
|
||
|
|
});
|
||
|
|
});
|