Dependency on `Request` class in `Searchable::process()` makes unit testing difficult

[toh-karashi]

Seaaaaarch/src/Searchable.php

Lines 13 to 17 in 3e606d5

	public function process($builder, $query = null)
	{
	if (is_null($query)) {
	$query = Request::query();
	}

I suggest changing it to like this:

class Searchable {

    protected $params = [];
    protected $request;

    public function __construct(Request $request = null)
    {
        $this->request = $request ?? Request::instance();
    }

    public function process($builder, $query = null)
    {
        if (is_null($query)) {
            $query = $this->request->query();
        }

...

You can probably use it as before,

$users = User::query()
   ...
   ->where(...)
   ->search(new UserSearch())
   ->get();

or you can pass an instance of the Request class.

$users = User::query()
   ...
   ->where(...)
   ->search(new UserSearch($request))
   ->get();