mock.property(object, propertyName[, value])
-
object
<Object> 正在模拟其值的对象。¥
object
<Object> The object whose value is being mocked. -
propertyName
<string> | <symbol>object
上要模拟的属性的标识符。¥
propertyName
<string> | <symbol> The identifier of the property onobject
to mock. -
value
<any> 用作object[propertyName]
模拟值的可选值。默认值:原始属性值。¥
value
<any> An optional value used as the mock value forobject[propertyName]
. Default: The original property value. -
返回:<Proxy> 模拟对象的代理。被模拟的对象包含一个特殊的
mock
属性,它是MockPropertyContext
的一个实例,可用于检查和更改被模拟属性的行为。¥Returns: <Proxy> A proxy to the mocked object. The mocked object contains a special
mock
property, which is an instance ofMockPropertyContext
, and can be used for inspecting and changing the behavior of the mocked property.
为对象的属性值创建一个模拟。这允许你跟踪和控制对特定属性的访问,包括读取(getter)或写入(setter)的次数,以及在模拟后恢复原始值。
¥Creates a mock for a property value on an object. This allows you to track and control access to a specific property, including how many times it is read (getter) or written (setter), and to restore the original value after mocking.
test('mocks a property value', (t) => {
const obj = { foo: 42 };
const prop = t.mock.property(obj, 'foo', 100);
assert.strictEqual(obj.foo, 100);
assert.strictEqual(prop.mock.accessCount(), 1);
assert.strictEqual(prop.mock.accesses[0].type, 'get');
assert.strictEqual(prop.mock.accesses[0].value, 100);
obj.foo = 200;
assert.strictEqual(prop.mock.accessCount(), 2);
assert.strictEqual(prop.mock.accesses[1].type, 'set');
assert.strictEqual(prop.mock.accesses[1].value, 200);
prop.mock.restore();
assert.strictEqual(obj.foo, 42);
});