CppUTest

Test plugins let you add a preaction and a post action to each test case. Plugin examples:

• Memory leak detector (provided)
• Pointer restore mechanism (provided) - helpful when tests overwrite a pointer that must be restored to its original value after the test. This is especially helpful when a pointer to a function is modified for test purposes.
• All Mutex's released - you could write a plugin that checks that any Mutexs or other shared resource is released before the test exists.

Example of a main with a SetPointerPlugin:

int main(int ac, char** av)
{
    TestRegistry* r = TestRegistry::getCurrentRegistry();
    SetPointerPlugin ps("PointerStore");
    r->installPlugin(&ps);
    return CommandLineTestRunner::RunAllTests(ac, av);
}

TEST_GROUP(HelloWorld)
{ 
	static int output_method(const char* output, ...)
	{
		va_list arguments;
		va_start(arguments, output);
		cpputest_snprintf(buffer, BUFFER_SIZE, output, arguments);
		va_end(arguments);
		return 1;
	}
	void setup()
  	{
            //overwrite the production function pointer witha an output method that captures 
            //output in a buffer.
	    UT_PTR_SET(helloWorldApiInstance.printHelloWorld_output, &output_method);
  	}
  	void teardown()
  	{
  	}
};


TEST(HelloWorld, PrintOk) 
{
	printHelloWorld();
	STRCMP_EQUAL("Hello World!\n", buffer);	
}

//Hello.h
#ifndef HELLO_H_
#define HELLO_H_

extern void printHelloWorld();

struct helloWorldApi {
	int (*printHelloWorld_output) (const char*, ...);
};

#endif /*HELLO_H_*/

//Hello.c

#include 
#include "hello.h"

//in production, print with printf.
struct helloWorldApi helloWorldApiInstance = {
	&printf
};

void printHelloWorld()
{
	helloWorldApiInstance.printHelloWorld_output("Hello World!\n");
}