In C++, TDD test cases are written using testing frameworks such as CppUnit, gtest, and so on, which require a technical background to understand them and hence, are generally used only by developers.

In C++, BDD test cases are written using a popular test framework called cucumber-cpp. The cucumber-cpp framework expects that the test cases are written in the Gherkin language, while the actual test case implementations can be done with any test framework, such as gtest or CppUnit.

However, in this book, we will be using cucumber-cpp with the gtest framework.