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# C/C++ Programming ## Labo 8 --- ```mermaid kanban column1[Unit tests] task1[Introduction] task2[Catch2 test framework] task3[Testing in vscode] column2[Exercises] task4[Labo 8 Devcontainer] task5[Project structure] task6[Exercises] ``` --- ## Unit tests --- Unit testing is a form of software testing by which isolated source code is tested to validate expected behavior. --- ### Why? ---  --- Tests... * Catch bugs early before they become hard to find. * Pinpoint where to look for a bug. <!-- .element: class="fragment" data-fragment-index="1" --> * Facilitate refactoring by preventing regressions. <!-- .element: class="fragment" data-fragment-index="2" --> * Encourage writing testable code, improving quality. <!-- .element: class="fragment" data-fragment-index="3" --> * Serve as documentation. <!-- .element: class="fragment" data-fragment-index="4" --> * Support implementing CI/CD pipelines. <!-- .element: class="fragment" data-fragment-index="5" --> --- Testing is a small upfront investment that saves a lot of time in the long run. --- ### Testing in C++ ---  --- ```c++ #include <catch.hpp> ``` ```c++ import fibonacci; ``` ```c++ TEST_CASE("compute fibonacci numbers", "[fibonacci][labo_7]") { REQUIRE(fibonacci(3) == 2); REQUIRE(fibonacci(4) == 3); REQUIRE(fibonacci(5) == 5); REQUIRE(fibonacci(6) == 8); REQUIRE(fibonacci(7) == 13); REQUIRE(fibonacci(8) == 21); REQUIRE(fibonacci(9) == 34); } ``` --- ### Read the documentation * <https://github.com/catchorg/Catch2/blob/devel/docs/tutorial.md> * <https://github.com/catchorg/Catch2/blob/devel/docs/assertions.md> --- ### Testing in vscode --- <video controls width="800"> <source src="/cpp-programming-slides/slides/session_08_labo/assets/vscode_unit_tests.mp4" type="video/mp4"> <img src="/cpp-programming-slides/slides/session_08_labo/assets/vscode_unit_tests.png" alt="vscode unit testing"> </video> --- ## Exercises --- ### Devcontainer <https://gitlab.apstudent.be/cpp-programming/devcontainer-labo-8> --- * Extends labo 4 devcontainer. * Add second configuration for `Release` builds. * Add `vcpkg` package manager. * Add unittest framework `Catch2`. * Add `cpprog_add_test` function. * See [README.md](https://gitlab.apstudent.be/cpp-programming/devcontainer-labo-8/-/blob/main/README.md) file in git repository. --- ```cmake # ./src/ex_1/CMakeLists.txt ``` ```cmake cpprog_add_library( TARGET ex_1_lib # library will be called ex_1_lib CXX_MODULES # module source files here "my_module_1.cpp" "my_module_2.cpp" ) ``` ```cmake cpprog_add_executable( TARGET ex_1 # executable will be called ex_1 CXX_SOURCES # old-style source files here "ex_1.cpp" DEPENDENCIES # libraries on which it depends ex_1_lib ) ``` Split exercises into a library and an executable with only the main function. Note: * This makes it possible to create unit tests that depend on the library. --- ```cmake # ./test/CMakeLists.txt ``` ```cmake cpprog_add_test( TARGET test_ex_1 # test will be called test_ex_1 CXX_SOURCES # unittest source files "my_module_1.test.cpp" DEPENDENCIES # libraries on which it depends ex_1_lib ) ``` Tests depend on the library. --- Test code depends heavily on macros and often contains a lot of magic numbers. Clang-tidy is disabled for unit tests. --- ### Exercises See digitap.