[SOLVED] Verify function pointer equality with Cmockery

Verify function pointer equality with Cmockery

I am writing Unit test and wondering how would I test function pointers with Cmockery.

A.c

void (*FunctionPtr)(void) = &funcA;

void funcA()
{
  // calls func B 
  funcB();
}

TestA.c

void Test_A( void ** state )
{
   // test for FunA; working as expected
}

void Test_FunctionPtr( void** state )
{
  // how to check here that FunctionPtr holds memory location of funcA?
  // I tried something like below:
  assert_memory_equal( FunctionPtr, funcA(), sizeof( funcA() ) );
}

During runtime I am getting error and I have no clue how to resolve that. May be I using wrong API to assert but don't know which one to call.

Below is my error:

error during runtime:      
Test_FunctionPtr: Starting test
No entries for symbol funcB.

Solution

funcA() calls the function. You want a pointer to the function, which is funcA or &funcA (does not make a difference which one you use: read here).

Also you want to compare the value saved in FunctionPtr with the address of funcA. You do not want to compare the memory where FunctionPtr points to with the function.

So instead of assert_memory_equal( FunctionPtr, funcA(), sizeof( funcA() ) ); I would use assert(FunctionPtr == funcA);

You wrote in your comment that you are using assert_int_equal now. Note that both values are not int, so if the macro uses printf with %d (or similar) in an error case you are invoking undefined behaviour.