C++ function call unit testing: verification of correctness of parameter passing and return value

When verifying C function calls in unit testing, the following two points need to be verified: Parameter passing: Use assertions to check whether the actual parameters match the expected values. Return value: Use assertions to check if the actual return value is equal to the expected value.

C Function call unit testing: verify parameter passing and return value

Introduction

Unit testing is crucial to ensure the correctness and reliability of software. When testing function calls in C, it is crucial to verify that the parameters passed and the expected return values ​​are correct. This article describes how to write unit tests to verify these aspects using the Catch2 testing framework.

Parameter passing

To test parameter passing, provide the function’s expected parameter values ​​as input to the test case. Use Catch2's REQUIRE assertion to check whether the parameters of the actual function call match the expected values:

TEST_CASE("Function with Int Argument") {
  int expected = 42;
  int actual = my_function(expected);

  REQUIRE(actual == expected);
}

Return value

To test the return value, Please use the REQUIRE assertion to check whether the actual value returned by the function call is equal to the expected value:

TEST_CASE("Function with Boolean Return Value") {
  bool expected = true;
  bool actual = my_function();

  REQUIRE(actual == expected);
}

Practical case

Suppose we have a add Function that accepts two integer values ​​and returns their sum:

int add(int a, int b) {
  return a + b;
}

The following test can be written using Catch2:

TEST_CASE("Add Function") {
  int a = 10;
  int b = 20;
  int expected = 30;
  int actual = add(a, b);

  REQUIRE(actual == expected);
}

When this test is run, it will assertactual is equal to expected, indicating that the function correctly sums the arguments and returns the result.

Conclusion

By using the Catch2 testing framework, you can easily write unit tests to verify the correctness of parameter passing and return values ​​of C function calls. This is essential to ensure the reliability of your code and prevent errors.

The above is the detailed content of C++ function call unit testing: verification of correctness of parameter passing and return value. For more information, please follow other related articles on the PHP Chinese website!