Better enum support in @testdox

[OskarStark]

While its more and more common to use native PHP enums in data providers, it would be nice if the @testdox annotation not just print the class, but the value.

Lets use the following example:

    /**
     * @test
     *
     * @dataProvider colorProvider
     * 
     * @testdox Color by string "$string" is $expected 
     */
    public function color(Color $expected, string $string): void
    {
        self::assertSame($expected, Color::byString($string);
    }

    public function colorProvider(): iterable
    {
        yield 'red' => [Color::RED, 'red'];
        yield 'blue' => [Color::RED, 'blue'];
    }

with the following enum:

namespace App\Enum;

enum Color: string
{
    case RED = 'red';
    case RED = 'blue';

    public function byString(string $string): self
    {    
        return match($string) {
            'red' => self::RED,
            'blue' => self::BLUE,
        };
    }
}

Right now the output of the @testdox annotation is:
Color by string "red" is App\Enum\Color

in case of a \BackedEnum, the following output would be more helpful:

- Color by string "red" is App\Enum\Color
+ Color by string "red" is App\Enum\Color::RED

I am willing to provide a PR if you can point me in the right direction

cc @localheinz as we talked about this already

[OskarStark]

Thank you very much @sebastianbergmann 🙏

That was fast 🥰

[rcsofttech85]

@OskarStark enum Color is invalid .