ios - 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了问题。如何验证功能？

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

有人知道 kiwi 测试用例吗？

Answer 1

您可以直接调用该方法:

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，您需要遍历 Controller 的属性，您希望这些属性在出现内存警告时被nil-ed。

或者，您可以查看单元测试应用程序的内存使用情况，并查看模拟内存警告后内存是否减少。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 Controller 将呈现在屏幕上，或者至少让它认为它已呈现并开始构建 View /表格 View 单元格等。

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，因为这些对象将在您的 autorelease pool 时被释放 作用域结束，而不是在主 autorelease pool 耗尽时结束。
注意。我没有添加getMemUsage()的实现，你可以找到如何实现它here .