kivutar / emutest

A headless libretro frontend to test libretro cores

emutest

Emutest is a simple test framework for libretro cores. It embeds a small Lua VM so tests can be written in Lua. It is a Lua scriptable headless libretro frontend.

Emutest is not a unit test framework. It is more like an end to end test utility that you can use in combination with test ROMs like the z80 Master System test ROM, or the Genesis VDP test ROM. It does a good job at testing the integration of your emulator with a libretro frontend.

Features:

• Lua scriptable
• Load core using dlopen
• Load games
• Run core
• Dump video framebuffer
• Get a checksum of the video framebuffer
• Dump video geometry and pitch
• Dump SRAM
• Load SRAM
• Dump Savestate
• Load Savestate
• Set core options
• Set inputs for any player at any frame
• Record and filter core logs
• Screenshots
• Reset
• Unload

Not yet implemented:

• Harware accelerated cores
• Analog inputs
• Libretro Subsystems
• Concurrent libretro cores loaded in the single test file

Known limitations:

• Cores using libco will crash because of Go

Setup

go install github.com/kivutar/emutest@latest

Usage:

Example:

emutest -t path/to/random_test.lua

You can also pass the core and rom like this:

emutest -L path/to/core_libretro.so -r path/to/rom.bin -t path/to/test.lua

This is an example test file:

set_options_string("mesen-s_hle_coprocessor = \"enabled\"")
load_core("../mesens/Libretro/mesens_libretro.so")
load_game("../roms/Nintendo - Super Nintendo Entertainment System/Super Mario Kart (Europe).zip")

local logs = get_logs()

if not string.find(logs, "Coprocessor: DSP1B") then
	error("missing dsp log")
end

for i=1,20 do run() end
local _, _, _, frame1 = get_video()
for i=1,500 do run() end
local _, _, _, frame2 = get_video()
if frame1 == frame2 then
	error("hle coproc not working")
end

local state = get_state()
if string.len(state) ~= 542720 then
	error("wrong savestate size")
end

screenshot("../mkart.png")

set_inputs(0, "0001000000000000") -- press start for player 1

for i=1,60 do run() end

screenshot("../mkart2.png")

local crc = get_fb_crc()

print(crc)

You can find more test examples in the examples folder.

To run the same test on a full set of ROMs in parallel:

find "./nesroms" -type f -name '*.zip' | \
parallel -j 8 ./emutest -L ~/mesen/Libretro/mesen_libretro.dylib -r {} -t boot200.lua