How can I find out if code is running inside a JUnit test or not?

Question

In my code I need to do certain fixes only when it is run inside a JUnit test. How can I find out if code is running inside a JUnit test or not? Is there something like JUni

Answer 1

I can find a justification for this, which is when you want to provide code in a production class to help testing. This would be similar to the Java assert, which only applies when the debug flag is set.

Something like this:

Object debugState() {
    // This is only meant to be called when testing
    if (!JUnit.isRunning()) {
        throw new IllegalStateException("Not in a test!");
    }
    // Now compute possibly costly debug information
    // not to be used in production
    Object state = ...
}