What are the steps and process of C++ function unit testing?

C Unit testing steps: Write the code to be tested and separate the test function and test code. Set up the test environment, including header files and calling RUN_ALL_TESTS(). Create test cases, using the TEST() macro to define the test case and the ASSERT_*() macros to verify the results. Write test cases for each feature. Compile the test files and run the executable to execute the tests. Check the test results to verify that all tests passed.

C Unit Testing: Steps and Process

Step 1: Write the code to be tested

Create a separate file to place the code to be tested. Make sure to separate the functionality being tested from the test code.

Step 2: Set up the test environment

Include the necessary header files in the test file, such as gtest/gtest.h. Create a main() function to call RUN_ALL_TESTS(), which will run all tests.

Step 3: Create a test case

Create a TEST() macro to define the test case. Each test case contains an ASSERT_*() macro to check the results of execution.

Step 4: Write Test Cases

Write a test case for each feature being tested. Use the ASSERT_*() macros to verify that expected results match actual results.

Practical case

The following is a C unit test case:

// my_function.h
int my_function(int a, int b);

// my_function_test.cpp
#include "gtest/gtest.h"

TEST(MyFunctionTest, PositiveNumbers) {
  ASSERT_EQ(my_function(2, 3), 5);
}

TEST(MyFunctionTest, NegativeNumbers) {
  ASSERT_EQ(my_function(-2, -3), -5);
}

Step 5: Run the test

Compile the test file using the g compiler and the -lgtest linker flag. Then run the executable to perform the tests.

Step 6: Check the results

After the test runs, it will output information about the test results. Verify that all tests passed with success or failure messages.

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