Getting started with Catch2

Catch2 is a multiparadigm testing framework for C++ and Objective-C. The name Catch2 follows on from Catch, the first version of the framework, which stands for C++ Automated Test Cases in Headers. It enables developers to write tests using either the traditional style of test functions grouped in test cases or the behavior-driven development (BDD) style with given-when-then sections. Tests are self-registered and the framework provides several assertion macros; out of these, two are used the most: one fatal (namely, REQUIRE) and one non-fatal (namely, CHECK). They perform expression decomposition of both the left-hand and right-hand side values, which are logged in case of failure. Unlike its first version, Catch2 no longer supports C++03. The current version of Catch2 is v3, which has some significant changes when compared to Catch2 v2, such as the library is no longer a single-header library but works as a regular library (that needs to be compiled)...