Tests: add more unit tests for fun.lua
Tests: add more unit tests for fun.lua

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