Add initial unit tests

.editorconfig

@@ -14,7 +14,6 @@ insert_final_newline = true
 [Makefile]
 indent_style = tab
 indent_size = 2
-end_of_line = lf
-charset = utf-8
-trim_trailing_whitespace = true
-insert_final_newline = true
+
+[*.py]
+generated_code = true

.github/workflows/test.yml

@@ -0,0 +1,42 @@
+name: Pytest
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.12"]
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - uses: schmiddim/action-wget-unzip@v2
+        with:
+          url: "https://github.com/gbdk-2020/gbdk-2020/releases/download/4.3.0/gbdk-linux64.tar.gz"
+          destination: gbdk
+      - uses: schmiddim/action-wget-unzip@v2
+        with:
+          url: "https://bgb.bircd.org/bgbw64.zip"
+          destination: bgb
+      - name: Install dependencies
+        run: |
+          cd tests
+          python -m pip install --upgrade pip
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+      - name: Lint with Ruff
+        run: |
+          cd tests
+          pip install ruff
+          ruff --format=github --target-version=py310 .
+        continue-on-error: true
+      - name: Test with pytest
+        run: |
+          cd tests
+          pytest -v -s

.gitignore

@@ -1,5 +1,7 @@
 .vscode/settings.json
+.venv/
 gbdk/
 Source/obj
 Source/out
 mgb.gb
+bgb

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "tests/gbdk_unit_test"]
+	path = tests/gbdk_unit_test
+	url = [email protected]:untoxa/gbdk_unit_test.git

.vscode/tasks.json

@@ -66,6 +66,16 @@
       },
       "dependsOn": "make-debug",
       "problemMatcher": []
+    },
+    {
+      "label": "make-test-roms",
+      "type": "shell",
+      "command": "make",
+      "args": [],
+      "options": {
+        "cwd": "tests/"
+      },
+      "problemMatcher": []
     }
   ]
 }

tests/.gitignore

@@ -0,0 +1,4 @@
+/build
+/unused
+__pycache__
+.pytest_cache

tests/Makefile

@@ -0,0 +1,25 @@
+MYDIR	= .
+BLDDIR	= $(MYDIR)/build
+FW	= $(MYDIR)/framework
+CC	= ../gbdk/bin/lcc -tempdir=$(BLDDIR) -Wl-j -Wl-m -Wl-w -Wl-yt2 -Wl-yo4 -Wl-ya4
+
+TESTS    		 = $(wildcard *.c)
+OBJS     		 = $(TESTS:%.c=$(BLDDIR)/%.o)
+TESTROMS     = $(TESTS:%.c=$(BLDDIR)/%.gb)
+
+
+all: clean mkdirs build-all
+
+.PHONY: clean
+clean:
+	rm -rf $(BLDDIR)
+
+.PHONY: mkdirs
+mkdirs:
+	mkdir -p $(BLDDIR)
+
+$(BLDDIR)/%.gb: $(MYDIR)/%.c mkdirs
+	$(CC) -o $@ $<
+
+.PHONY: build-all
+build-all: $(TESTROMS)

tests/bgb_get_snapshot.py

@@ -0,0 +1,141 @@
+import subprocess
+from array import array
+import os
+from pathlib import Path
+from PIL import Image, ImageChops
+
+from gbdk_unit_test.framework.BGB_toolkit import load_noi, read_bgb_snspshot
+
+base_dir = os.path.dirname(os.path.realpath(__file__))
+base_path = Path(base_dir)
+
+
+def load_rom_snapshot(rom_relative):
+
+    make_and_run(rom_relative)
+
+    snapshot_file = base_path.joinpath(rom_relative).with_suffix('.sna')
+
+    if not snapshot_file.is_file():
+        raise Exception("Cannot load snapshot: " + snapshot_file)
+
+    noi_file = base_path.joinpath(rom_relative).with_suffix('.noi')
+    if not snapshot_file.is_file():
+        raise Exception("Cannot load symbols: " + noi_file)
+
+    screenshot = base_path.joinpath(rom_relative).with_suffix('.bmp')
+
+    snapshot = read_bgb_snspshot(snapshot_file)
+    symbols = load_noi(noi_file)
+    symbols = {value: key for key, value in symbols.items()}
+
+    snapshot['symbols'] = symbols
+    snapshot['screenshot'] = screenshot
+
+    return snapshot
+
+
+def make_and_run(rom_relative):
+    make_rom(rom_relative)
+
+    rom_path_full = base_path.joinpath(rom_relative)
+    screenshot_path = rom_path_full.with_suffix('.bmp')
+
+    subprocess.run([
+        "/usr/bin/env",
+        "wine",
+        "../bgb/bgb64.exe",
+        "-set \"DebugSrcBrk=1\"",
+        "-hf",
+        "-stateonexit",
+        "-screenonexit",
+        screenshot_path,
+
+        rom_relative,
+    ],
+        cwd=base_dir,
+        # stdout=subprocess.DEVNULL,
+        # stderr=subprocess.DEVNULL,
+    )
+
+    if not rom_path_full.with_suffix(".sna").is_file():
+        raise Exception("Tried to run rom, failed " + rom_relative)
+
+
+def make_rom(rom_relative):
+    result = subprocess.call(
+        [
+            "/usr/bin/env",
+            "make",
+            rom_relative
+        ],
+        cwd=base_dir,
+        # stdout=subprocess.DEVNULL
+    )
+
+    if result != 0:
+        raise Exception("Tried to make rom, failed " + rom_relative)
+
+
+# The following code is repurposed from unit_checker.py by untoxa (MIT License)
+
+# WRAM = 49152
+mem_map = {
+    'VRAM': 0x8000,
+    'WRAM': 0xC000,
+    'OAM': 0xFE00,
+    'IO_REG': 0xFF00,
+    'HRAM': 0xFF80,
+}
+
+
+def symbol_addr(snapshot, symbol, base):
+    if type(base) is str:
+        base = mem_map[base.upper()]
+    return snapshot['symbols'].get(symbol) - base
+
+
+def get(snapshot, section, address, len=0):
+    if isinstance(address, str):
+        address = symbol_addr(snapshot, address, section)
+
+    if len > 1:
+        return snapshot[section][address:address + len]
+    else:
+        return snapshot[section][address]
+
+
+def ASCIIZ(snapshot, section, address):
+    ofs = address
+    data = snapshot[section]
+    fin = ofs
+    while data[fin] != 0:
+        fin += 1
+    return str(data[ofs:fin], 'ascii') if fin - ofs > 0 else ''
+
+
+def CHECKSCREEN(snapshot, file_name):
+    image_one = Image.open(base_path.joinpath(file_name)).convert('RGB')
+    image_two = Image.open(snapshot['screenshot']).convert('RGB')
+
+    diff = ImageChops.difference(image_one, image_two)
+
+    return (diff.getbbox() is None)
+
+
+def find(input: dict | array, val: str | int, parent_key: str | None):
+    if isinstance(input, array):
+        for i, v in enumerate(input):
+            if v == val:
+                print("found", [parent_key, i])
+                return [parent_key, i]
+            elif isinstance(v, array):
+                find(v, val, i)
+        return
+
+    for k, v in input.items():
+        if v == val:
+            print("found", [parent_key, k])
+            return [parent_key, k]
+        elif isinstance(v, array) or isinstance(v, dict):
+            find(v, val, k)

tests/conftest.py

@@ -0,0 +1,8 @@
+import pytest
+
+from bgb_get_snapshot import load_rom_snapshot
+
+
+@pytest.fixture
+def snapshot(request):
+    return load_rom_snapshot(request.param)

tests/pu1_plays_note.c

@@ -0,0 +1,35 @@
+#include <gbdk/emu_debug.h>
+#include <gbdk/platform.h>
+
+#include "../Source/io/midi.h"
+
+#include "../Source/mGB.h"
+#include "../Source/synth/common.c"
+#include "../Source/synth/pulse.c"
+#include "../Source/synth/wav.c"
+
+bool systemIdle = true;
+
+uint8_t statusByte;
+uint8_t addressByte;
+uint8_t valueByte;
+uint8_t capturedAddress;
+
+uint8_t result[2] = {0U, 0U};
+
+void main(void) {
+  rAUDENA = AUDENA_ON;
+  rAUDVOL = AUDVOL_VOL_LEFT(7U) | AUDVOL_VOL_RIGHT(7U);
+
+  setOutputPan(PU1, 64U);
+
+  addressByte = 64U; // MIDI note
+  valueByte = 127U;  // MIDI velocity
+
+  playNotePu1();
+  updatePu1();
+
+  delay(500);
+
+  EMU_BREAKPOINT;
+}

tests/pu1_test.py

@@ -0,0 +1,18 @@
+import pytest
+
+from bgb_get_snapshot import get
+
+
+def describe_pu1():
+
+    @pytest.mark.parametrize('snapshot', ['build/pu1_plays_note.gb'], indirect=True)
+    def it_plays_a_note(snapshot):
+        rAUD1LOW = get(snapshot, 'IO_REG', '_NR13_REG')
+        rAUD1HIGH = get(snapshot, 'IO_REG', '_NR14_REG')
+
+        # noteIndex = 64U - 36U == 28U
+        # f = freq[noteIndex] == 1650U == 0x0672
+
+        assert rAUD1LOW == 0x72
+        retrig = 0x80
+        assert rAUD1HIGH == 0x06 | retrig

tests/requirements.txt

@@ -0,0 +1,4 @@
+pillow ~= 10.4.0
+pytest ~= 8.3.0
+pytest-describe ~= 2.2.0
+# pytest-sugar ~= 1.0.0

tests/screens_test.py

@@ -0,0 +1,10 @@
+import pytest
+
+from bgb_get_snapshot import CHECKSCREEN
+
+
+def describe_screens():
+
+    @pytest.mark.parametrize('snapshot', ['build/splash_screen.gb'], indirect=True)
+    def it_matches_snapshot(snapshot):
+        assert CHECKSCREEN(snapshot, "splash_screen.png")

tests/splash_screen.c

@@ -0,0 +1,17 @@
+#include <gbdk/emu_debug.h>
+#include <gbdk/platform.h>
+
+#include "../Source/screen/splash.c"
+#include "../Source/screen/utils.c"
+
+uint8_t j;
+
+void main(void) {
+
+  displaySetup();
+
+  showSplashScreen();
+  delay(500);
+
+  EMU_BREAKPOINT;
+}

tests/wav_test.py

@@ -0,0 +1,30 @@
+import pytest
+from array import array
+
+from bgb_get_snapshot import get
+
+
+def describe_wav_loading():
+
+    @pytest.mark.parametrize('snapshot', ['build/wav_test_load_and_play.gb'], indirect=True)
+    def it_loads_the_correct_waveform(snapshot):
+        _AUD3WAVERAM = get(snapshot, 'IO_REG', '__AUD3WAVERAM', 16)
+
+        expected = array('B')
+        expected.frombytes(bytearray([0x22, 0x55, 0x77, 0xAA, 0xBB, 0xDD, 0xEE, 0xFF,
+                                      0xEE, 0xDD, 0xBB, 0xAA, 0x77, 0x66, 0x44, 0x00]))
+        assert _AUD3WAVERAM == expected
+
+    @pytest.mark.parametrize('snapshot', ['build/wav_test_load_and_play.gb'], indirect=True)
+    def it_plays_a_note(snapshot):
+        rAUD3LOW = get(snapshot, 'IO_REG', '_NR33_REG')
+        rAUD3HIGH = get(snapshot, 'IO_REG', '_NR34_REG')
+
+        # noteIndex = 64 - 24 == 40
+        # freq[noteIndex] == 1849U == 0x0739
+
+        retrig = 0x80
+        assert rAUD3LOW == 0x39
+        assert rAUD3HIGH == 0x07 | retrig
+
+    # TODO: check frequency, env, vol etc