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看下面的代码,我需要在逻辑测试中做mock,难点是[UIApplication sharedApplication]总是返回nil,各位聪明人是怎么解决这个问题的呢?谢谢你。

    UIWindow* root = [UIApplication sharedApplication].delegate.window;
    UIWebView *aWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
    [aWebView setDelegate:tracker];
    [aWebView loadRequest:request];
    [root addSubview:aWebView];
    [aWebView release], aWebView = nil;
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