Catch2

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## What is 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.
Test names do not have to be valid identifiers, assertions look like
normal C++ boolean expressions, and sections provide a nice and local way
to share set-up and tear-down code in tests.

**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]" ) {
    REQUIRE( factorial( 1) == 1 );
    REQUIRE( factorial( 2) == 2 );
    REQUIRE( factorial( 3) == 6 );
    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.