How to reach full CodeCoverage? Free Blocks through Exception

Question

I've got a little Problem.(at unittesting) - I unittest a class where methods raises exceptions. The structure is:

    public bool DoA()
    {
        ThrowException();
        return true;
    }

    public void DoB()
    {
        ThrowException();
    }

    private static void ThrowException()
    {
        throw new NotSupportedException();
    }

The result from the CodeCoverage is not 100% - the return statement and the closing curly bracket from DoA() and the closing curly bracket from Do()B are not under the codeCoverage(because they not reached). I know, thats not really important for the unittest because i still checked the functionality but just for me - its possible and how i reach the full CodeCoverage? Maybe through exclude? (possible change the testcode / program code)

The code is unreachable, because 100% of the time you throw an exception - how do you expect to get 100% code completion when you do this? You simply can't. — Moo-Juice, May 08 '13 at 11:22

score 6 · Answer 1 · edited May 08 '13 at 11:36

6

You can't reach the return true part of you code, so you can remove it. It is bad to have unreachable code in your projects. Or because the function DoA() is not finished, you can use: [ExcludeFromCodeCoverage]

[ExcludeFromCodeCoverage]
public bool DoA()
{
    ThrowException();
    return true;
}

edited May 08 '13 at 11:36

Moo-Juice

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answered May 08 '13 at 11:24

Peter

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Thanks,i still know this attribut, but it just cover complete methods - not single lines ;). - looks like i must abadon the complete codeCoverage at this case. – basti May 14 '13 at 09:31

score 5 · Answer 2 · answered May 08 '13 at 11:22

5

It's impossible to get full coverage here. Everything after a throw is dead code.

Also, code (line) coverage is not the holy grail in testing. Yes, it is important, but it is not the one ultimate criterion.

answered May 08 '13 at 11:22

derabbink

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Thanks, i know thats not the holy grail - for me not but sometimes for head ;) – basti May 14 '13 at 09:35

How to reach full CodeCoverage? Free Blocks through Exception

2 Answers2