Reinhold Gschweicher 031a57e7b7
Fix Catch.cmake helper by setting variable globally
Set `_CATCH_DISCOVER_TESTS_SCRIPT` helper variable globally. Otherwise in a
scoped call (like `add_subdirectory()`) the variable gets lost. This lost
variable results in a post build error with not much information to lead to the
root of the problem.

This enables the usage of the helper script with the following example structure

- CMakeLists.txt (project root with `add_subdirectory(external/catch2)`
- external/catch2
  - CMakeLists.txt (contents listed below)
  - contrib/Catch.cmake
  - contrib/CatchAddTests.cmake
  - catch2/catch.hpp
- tests
  - CMakeLists.txt (add tests with `catch_discover_tests(${PROJECT_NAME})`)

contents of project specific helper `external/catch2/CMakeLists.txt`
```cmake
cmake_minimum_required (VERSION 3.1...${CMAKE_VERSION})
project(Catch2 LANGUAGES CXX VERSION 2.13.3)
add_library(Catch2 INTERFACE)
target_include_directories(Catch2
  INTERFACE
    $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}>
)
 # provide a namespaced alias for clients to 'link' against if catch is included as a sub-project
add_library(Catch2::Catch2 ALIAS Catch2)
include(contrib/Catch.cmake)
```
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Catch2 v3 is being developed!

You are on the devel branch, where the next major version, v3, of Catch2 is being developed. As it is a significant rework, you will find that parts of this documentation are likely still stuck on v2.

For stable (and documentation-matching) version of Catch2, go to the v2.x branch.

For migrating from the v2 releases to v3, you should look at our documentation. It provides a simple guidelines on getting started, and collects most common migration problems.

What's the Catch2?

Catch2 is mainly a unit testing framework for C++, but it also provides basic micro-benchmarking features, and simple BDD macros.

Catch2's main advantage is that using it is both simple and natural. Tests autoregister themselves and do not have to be named with valid identifiers, assertions look like normal C++ code, and sections provide a nice way to share set-up and tear-down code in tests.

How to use it

This documentation comprises these three parts:

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Description
A modern, C++-native, test framework for unit-tests, TDD and BDD - using C++14, C++17 and later (C++11 support is in v2.x branch, and C++03 on the Catch1.x branch)
Readme 62 MiB
Languages
C++ 90.1%
CMake 5.5%
Python 3.2%
Meson 0.7%
Starlark 0.3%