[add] unit_test for base engine
[add] unit_test for base engine

misnyo/searx,asciimoo/searx,asciimoo/searx,jcherqui/searx,dalf/searx,misnyo/searx,dalf/searx,asciimoo/searx,misnyo/searx,jcherqui/searx,dalf/searx,dalf/searx,jcherqui/searx,asciimoo/searx,misnyo/searx,jcherqui/searx