Learn Testing Libraries with Unit Tests | Distribution and Real Usage

Unit testing is an essential part of developing robust C++ libraries. By writing unit tests, you ensure that each function in your library behaves as expected under various conditions. Automated tests help you catch regressions early, simplify future refactoring, and give users confidence in your library's reliability. Among the many testing frameworks available for C++, Catch2 stands out for its simplicity, modern syntax, and ease of integration. Catch2 allows you to write readable test cases that are easy to maintain and execute as part of your build process. With Catch2, you can organize your library's tests in separate files, group related tests, and use expressive assertions to check for correct behavior.

simple_math.cpp

simple_math.h

test_simple_math.cpp


              123456
            
#include "simple_math.h"

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

Note

While Catch2 is a popular choice for C++ unit testing, you might also consider frameworks like Google Test (gtest), Boost.Test, doctest, or CppUTest. Each has its own strengths:

Google Test is widely used in large projects;
Boost.Test integrates well with the Boost ecosystem;
doctest offers fast compile times and a lightweight footprint;
CppUTest is suited for embedded systems.
Choose a framework based on project requirements, team familiarity, and integration needs.

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Section 3. Chapter 4

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