如何验证 kiwi bdd 测试用例中的 didReceiveMemoryWarning 函数？

Question

我在使用 kiwi 测试用例验证是否收到内存警告功能时遇到问题。如何验证功能？

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

有人知道 kiwi 测试用例吗？

Answer 1

直接调用方法即可：

it(@"Should cleanup when receiving a memory warning", ^{
    [controller didReceiveMemoryWarning];
    // assert here that the data that you expected was released
});

使用这种方法，您将需要遍历您希望 nil-ed 出现内存警告的控制器的属性。

或者，您可以查看单元测试应用程序的内存使用情况，看看在模拟内存警告后内存是否减少了。这不如第一种方法准确，但它可以给您一些提示。并且您还需要确保控制器将呈现在屏幕上，或者至少让它认为它已呈现并开始构建视图/table 视图单元等

it(@"Should cleanup when receiving a memory warning", ^{
    vm_size_t memoryBeforeMemWarning;
    vm_size_t memoryAfterMemWarning;
    MyController *controller = nil;

    @autoreleasepool {
        controller = ...;
        // call controller.view, or other methods that create the view
        // also call any other methods that trigger subview creation

        memoryBeforeMemWarning = getMemUsage();
        //simulate the memory warning
        [controller didReceiveMemoryWarning];
    }
    memoryAfterMemWarning = getMemUsage();

    // reference the variable here to make sure ARC doesn't
    // release it when it detects its last reference
    controller = nil;

    // now assert upon the difference between the two reported memory usages
});

您需要使用 autorelease pool 来控制使用 autorelease 创建的对象，因为当您的 autorelease pool 作用域结束时，这些对象将被释放，而不是当主要 autorelease pool 耗尽时。
注意.我没有添加getMemUsage()的实现，你可以看看如何实现here.

如何验证 kiwi bdd 测试用例中的 didReceiveMemoryWarning 函数？

How to verify didReceiveMemoryWarning function in kiwi bdd test cases?

ios

objective-c

unit-testing

kiwi