Input to mock functions

As described in section [*] the test can provide the return value by the use of the optional return value parameter to the macro EXPECT, if the default value of zero is not adequate.

There is also an optional parameter to the EXPECT_MOCK macro. This parameter can be used by the test to pass information to the mock function.

The parameter given to EXPECT_MOCK can be read from within the mock function using the macro MOCK_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_MOCK ( 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 MOCK_VALUE;
  }

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



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