Question

I have a function that calls a test on each object. I want to be able to retest if the current test fails.

        foreach (TestObject test in Tests)
        {
              test.RunTest()
        }
        //This is in the TestObject class
        RunTest()
        {
             if (failure)
             {
                 //Want to be able to run RunTest() again without interrupting the foreach loop.
             }
        }

Answer 1

For both answers above, the solutions will result in RunTest() running forever if the failure is legitimate (i.e. not a transient failure, which I can only guess is what you’re hitting). You may consider doing one of the loops above, but instead keep a count of how many failures and bail out once that threshold is reached. Something like:

int FailureThreshold = 3;
foreach (TestObject test in Tests) 
{
    int failCount = 0;

    while (failCount < FailureThreshold)
    {
        if (test.RunTest())
        {
            break;
        }
        else
        {
            failCount++;
        }
    }
}

You should also consider keeping statistics for how many times you need to loop in order to pass. This could be a great indicator of test stability.