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Validating parameters to functions

As part of the function validation, it is also possible to validate the parameters passed from the unit. 

  void test_addition(void) {
    EXPECT  ( invalid );
    EXPECT  ( invalid );
    EXPECT_VALIDATE ( add, check_add );
    VALIDATE(calculate(3,7,'+'), EXPECTED_SUM);
    }
The EXPECT_VALIDATE macro shown in sample6 above2.1, instructs the framework to expect a function call to add. check_add is a reference to a mock that will verify the arguments being passed to add. This mock function must have the same prototype as the function it validates. The sample function check_add shown below has the same prototype as the function add called by calculate. 
  int check_add(int left_operand, int right_operand) {
    VALIDATE(left_operand,3);
    VALIDATE(right_operand,7);
    return 10;
    }
The function validates that each of the parameters are as expected for this test. Other tests might have other expectations to the parameters, so they will use another mock function. It is possible to have many mock functions, each of which can be used to test parameters for add in different scenarios. The output from the mock function check_add will look something like this 

 PASSED verify left_operand
   expected .......... 3 (3)
   actual ............ 3
 
 PASSED right_operand
   expected .......... 7 (7)
   actual ............ 7


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