Testing conditions that exit the test

问题

I have to test several routines/functions that have several if statements that leads to a terminate() or exit() statement that stops the test execution.

I was wondering what's the best/correct approach in testing functions like this?

For example, if I had something like the following:

void function foo(void) 
{
     if(conditionA) 
     {
        Terminate( //include infinite while loop resulting in timeout); 
    } 
    if(conditionB) 
    {
        Terminate( //includes infinite white loop resulting in timeout);
    }
}

How do I hit conditionB when I have a test case that is true for conditionA?

I think I would have to create a separate test case for conditionB to be true (and condition A to be false). However, the test still executes conditionA because I have two test cases run. Test Case #1, will enter conditionA and exit the test. Withby Test Case #2, will not run because of Test Case #1.

So, how should I structure the flow of my testing paradigm?

Currently, I have a test suite for each function that contains several test cases.

回答1:

Using exit outside of main is usually a bad idea; callers are offered little opportunity to clean up any resources sanely prior to the process terminating.

Think about it... What happens when fopen fails? What about fgets, malloc, pthread_create, socket? Do any of those call exit? Don't you think it'd be sensible to design your failure modes to be as consistent as possible with the rest of the world?

Use a return value and let the caller decide whether to terminate or not... Then you can construct separate testcases for each function and... viola! Your problem has disappeared...

回答2:

You have 2 options:
1 Run the test in separate processes - a framework like check can do that easily for you.

Check is a unit testing framework for C. It features a simple interface for defining unit tests, putting little in the way of the developer. Tests are run in a separate address space, so both assertion failures and code errors that cause segmentation faults or other signals can be caught

2 Stub the offending function - either by linking your own version of terminate() function or by using a macro to redefine terminate to your own version. i.e.
#define terminate(_dummy_) my_terminate(_dummy_)

回答3:

Simple:

void function foo(void) 
{
     if(conditionA) 
     {
        if(conditionB) 
        exit(0); 
    } 
    else if(conditionB) 
    {
        exit(0);
    }
}

来源：https://stackoverflow.com/questions/32131027/testing-conditions-that-exit-the-test