如何测试所需的 init(coder:)? [英] How to test required init(coder:)?

问题描述

在我的自定义类 WLNetworkClient 中，我必须实现这样的方法:

In my custom class WLNetworkClient I had to implement such method:

required init(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

我不需要使用它，但我想测试它以实现 100% 的代码覆盖率.您知道如何实现这一目标吗?

I do not need to use that, but I would like to test this to make 100% code coverage. Do you know how to achieve this?

我尝试了以下方法但没有成功:

I tried following way with no success:

let nc = WLNetworkClient(coder: NSCoder())
XCTAssertNotNil(nc)

推荐答案

生产代码:

required init?(coder: NSCoder) {
    return nil
}

测试:

func testInitWithCoder() {
    let archiverData = NSMutableData()
    let archiver = NSKeyedArchiver(forWritingWithMutableData: archiverData)
    let someView = SomeView(coder: archiver)
    XCTAssertNil(someView)
}

由于所需的初始化器返回nil并且没有使用编码器，所以上面的代码可以简化为:

Since the required initializer returns nil and does not use the coder, the above code can be simplified to:

func testInitWithCoder() {
    let someView = SomeView(coder: NSCoder())
    XCTAssertNil(someView)
}

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