catch2/README.md

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## What is Catch2?

Catch2 is a light-weight yet powerful unit testing framework for C++14. Catch2 also contains basic micro-benchmarking features, simple BDD macros, and more.

Catch2's main advantage compared to other unit testing frameworks is its ease of use. It allows for unit tests to be created in a both a simple and natural manner. For example: Test names do not have to be valid identifiers, assertions are written similar to normal C++ boolean expressions, and sections provide a nice and local way to share set-up and tear-down code in tests. Furthermore, users can run specific tests or sets of tests conveniently through the command line

**Example unit test**
```cpp
#include <catch2/catch_test_macros.hpp>

#include <cstdint>

uint32_t factorial( uint32_t number ) {
    return number <= 1 ? number : factorial(number-1) * number;
}

TEST_CASE( "Factorials are computed", "[factorial]" ) {
    SECTION( "odd factorials are tested" )
        REQUIRE( factorial( 1) == 1 );
        REQUIRE( factorial( 3) == 6 );
    SECTION( "even factorials are tested" )
        REQUIRE( factorial( 2) == 2 );
        REQUIRE( factorial(10) == 3'628'800 );
}
```

**Example microbenchmark**
```cpp
#include <catch2/catch_test_macros.hpp>
#include <catch2/benchmark/catch_benchmark.hpp>

#include <cstdint>

uint64_t fibonacci(uint64_t number) {
    return number < 2 ? number : fibonacci(number - 1) + fibonacci(number - 2);
}

TEST_CASE("Benchmark Fibonacci", "[!benchmark]") {
    REQUIRE(fibonacci(5) == 5);

    REQUIRE(fibonacci(20) == 6'765);
    BENCHMARK("fibonacci 20") {
        return fibonacci(20);
    };

    REQUIRE(fibonacci(25) == 75'025);
    BENCHMARK("fibonacci 25") {
        return fibonacci(25);
    };
}
```

_Note that benchmarks are not run by default, so you need to run it explicitly
with the `[!benchmark]` tag._


## Catch2 v3 has been released!

You are on the `devel` branch, where the v3 version is being developed.
v3 brings a bunch of significant changes, the big one being that Catch2
is no longer a single-header library. Catch2 now behaves as a normal
library, with multiple headers and separately compiled implementation.

The documentation is slowly being updated to take these changes into
account, but this work is currently still ongoing.

For migrating from the v2 releases to v3, you should look at [our
documentation](docs/migrate-v2-to-v3.md#top). It provides a simple
guidelines on getting started, and collects most common migration
problems.

For the previous major version of Catch2 [look into the `v2.x` branch
here on GitHub](https://github.com/catchorg/Catch2/tree/v2.x).


## How to use it
This documentation comprises these three parts:

* [Why do we need yet another C++ Test Framework?](docs/why-catch.md#top)
* [Tutorial](docs/tutorial.md#top) - getting started
* [Reference section](docs/Readme.md#top) - all the details


## More
* Issues and bugs can be raised on the [Issue tracker on GitHub](https://github.com/catchorg/Catch2/issues)
* For discussion or questions please use [our Discord](https://discord.gg/4CWS9zD)
* See who else is using Catch2 in [Open Source Software](docs/opensource-users.md#top)
or [commercially](docs/commercial-users.md#top).