Unit Testing: Logging and Dependency Injection

Question

So regards logging from SO and other sites on the Internet the best response seems to be:

void DoSomething() {
    Logger.Log(\"Doing something!\");
    // Code.         


        

Answer 1

Although I agree with others that I wouldn't apply TDD to logging, I would try to ensure that unit testing covers all code paths that contain logging statements. And importantly ensure that the highest verbosity level is configured while running the unit tests, so that all logging statements are executed.

For example, the following code has a bug which will throw a FormatException only if if Debug level tracing is enabled.

if (logger.IsDebugEnabled)
{
    string message = String.Format(CultureInfo.CurrentCulture, 
          "... {1} ...", someValue);
    logger.Debug(message);
}