Tests: expose `exist` function to specs
Tests: expose `exist` function to specs

luarocks/luarocks,tarantool/luarocks,keplerproject/luarocks,tarantool/luarocks,tarantool/luarocks,keplerproject/luarocks,keplerproject/luarocks,keplerproject/luarocks,luarocks/luarocks,luarocks/luarocks