Write unit tests to verify the correctness of your code using the GoogleTest framework.
Unit testing is the practice of testing individual units or components of a software to ensure they work correctly in isolation. A unit is the smallest testable part of an application, often a single function or a method of a class. The goal is to verify that each part of the code performs as expected. Writing tests helps you catch bugs early in the development process, makes your code more robust, and provides confidence when refactoring or adding new features, as you can run the tests to ensure you haven't broken existing functionality. GoogleTest is a widely-used, open-source C++ testing framework developed by Google. It provides a rich set of assertions to check for various conditions. You write tests using macros like TEST() to define a test case. Inside the test, you use assertion macros like EXPECT_EQ(expected, actual) to check if two values are equal, ASSERT_TRUE(condition) to check if a condition is true, and many others. You then compile and run your tests. The framework provides clear output, telling you which tests passed and which failed, along with detailed messages for the failures. Integrating unit testing into your development workflow is a hallmark of a professional software engineer.