How to test function store with PhpSpec

I have just studied phpSpec, I have a function store with validate and saving on database. But I don't know how to test it. Can you help to write test it with PhpSpec? Thanks alot Here is my function:

public function store(Request $request)
 {
       $validator = Validator::make($request->all(), [
            'name'        => 'required',
            'alias'       => 'regex:/^[a-z0-9\-]+/|unique:article_categories',
            'image'       => 'string',
            'description' => 'string',
            'parent_id'   => 'numeric',
            'order'       => 'numeric',
            'status'      => 'numeric',
        ]);
        if ($validator->fails()) {
            return response()->json($validator->errors());
        }
        $category = Category::create($request->all());
        return response()->json($category);
    }