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Input to mock functions

As described in section [*] the test can give the return value by the use of the macro SIMULATE, if the default value of zero used by EXPECT is not adequate.

There is also an equivalent EXPECT_SIMULATE macro, that is used by the test to indicate that a mock function should be used to validate the parameters.

The simulate value given to EXPECT_SIMULATE can be read from within the mock function using the macro SIMULATE_VALUE. This can be used to pass parameters between tests and mock functions as shown in sample8 below2.1 

  void test_addition(void) {
    EXPECT  ( invalid );
    EXPECT  ( invalid );
    EXPECT_SIMULATE ( add, check_add , EXPECTED_SUM);
    VALIDATE(calculate(3,7,'+'), EXPECTED_SUM);
    }

If the test is constructed as shown above, the value EXPECTED_SUM can be extracted and returned from the mock like this: 

  int check_add(int left_operand, int right_operand) {
    VALIDATE(left_operand,3);
    VALIDATE(right_operand,7);
    return SIMULATE_VALUE;
    }

The same thing can be achived by having several different mocks each returning their own unique value, but, by the use of SIMULATE_VALUE, the same mock can be shared between several tests.


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