在C＃中使用setter作为参数？ （也许与代表？）

Question

We're working on an API for some hardware and I'm trying to write some tests for it in C#. try-catch blocks for repetitive tasks were making my code bloated and repetitive so for getters I was able to wrap like this:

TestGetter(Func<int> method, double expectedVal)
{
    int testMe = 0;
    try
    {
        testMe = method();
        PassIfTrue(testMe == expectedVal);
    }
    catch (Exception e)
    {
         Fail(e.Message);
    }
}

So I query the hardware for some known value and compare. I can call with:

TestGetter( () => myAPI.Firmware.Version, 24); //Or whatever.

Which works quite well. But I'm not sure how to do the same with setters. Ie to ensure that the API actually set a value (and doesn't timeout or whatever when I try to set). I'd like to pass the setter to the test method and invoke it in there.

Bonus question: Is there a way to do this with a generic type? There are some custom types defined in the API and I'm not sure of a good way to write these test wrappers for them without writing a new overloaded method for every type. Thanks for any and all help!

Answer 1

You could pass the getter and the setter to the function:

void TestSetter<T>(Func<T> getter, Action<T> setter, T value)
{
    try
    {
        setter(value);
        PassIfTrue(EqualityComparer<T>.Default.Equals(getter(), value));
    }
    catch (Exception e)
    {
         Fail(e.Message);
    }       
}

This sets the value, then gets it and compares to the value passed to the setter.

You'd have to call it like:

TestSetter(() => myAPI.Firmware.Version, v => myAPI.Firmware.Version = v, 24);

Answer 2

You can make them generic like Reeds, but you need to use different comparison methods:

    public static void TestGetter<T>(Func<T> method, T expectedVal)
    {       
        try
        {
            T actual = method();
            PassIfTrue(expectedVal.Equals(actual));
        }
        catch (Exception ex)
        {
            Fail(ex.Message);
        }
    }

    public static void TestSetter<T>(Action setMethod, Func<T> getMethod, T expectedVal)
    {
        try
        {
            setMethod();
            T actual = getMethod();
            PassIfTrue(expectedVal.Equals(actual));
        }
        catch (Exception ex)
        {
            Fail(ex.Message);
        }
    }

You could also pass in a Comparer action to test them if you don't think the Equals method would work for the expected types.