Asserting with Catch2

Unlike other testing frameworks, Catch2 does not provide a large set of assertion macros. It has two main macros: REQUIRE, which produces a fatal error, stopping the execution of the test case upon failure, and CHECK, which produces a non-fatal error upon failure, continuing the execution of the test case. Several additional macros are defined; in this recipe, we will see how to put them to work.

Getting ready

You should now be familiar with writing test cases and test functions using Catch2, a topic we covered in the previous recipe, Writing and invoking tests with Catch2.

How to do it...

The following list contains the available options for asserting with the Catch2 framework:

• Use CHECK(expr) to check whether expr evaluates to true, continuing the execution in case of failure, and REQUIRE(expr) to make sure that expr evaluates to true, stopping the execution of the test in case of failure:

  int a = 42;
  CHECK(a == 42);
  REQUIRE...