Add testing infrastructure and test for shapes example (#14)

Add a basic byte-checked test for examples.

.github/workflows/run_tests.yaml

@@ -0,0 +1,23 @@
+name: "Run Tests"
+
+on:
+- workflow_dispatch
+- pull_request
+
+jobs:
+  run-tests:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python 3.11
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.11'
+    - name: Install dependencies and local packages
+      run: python -m pip install mpremote click
+    - name: Install MicroPython
+      uses: BrianPugh/install-micropython@v2
+    - name: Install Micropython dependencies
+      run: micropython -m mip install unittest
+    - name: Run tests
+      run: python -m ci.test

ci/rgb565_to_png.py

@@ -0,0 +1,38 @@
+import array
+from pathlib import Path
+
+from PIL import Image
+
+def read_rgb565(path):
+    with open(path, 'rb') as fp:
+        buffer = fp.read()
+
+    rgb565 = array.array('H', buffer)
+    rgb565.byteswap()
+    return rgb565
+
+def rgb565_to_rgb24(rgb565):
+    rgb24 = array.array('B', bytearray(3*len(rgb565)))
+    for i, pixel in enumerate(rgb565):
+        r = (pixel & 0b1111100000000000) >> 11
+        g = (pixel & 0b0000011111100000) >> 5
+        b = (pixel & 0b0000000000011111)
+        rgb24[3 * i] = int((r / 31) * 255)
+        rgb24[3 * i + 1] = int(round((g / 63) * 255))
+        rgb24[3 * i + 2] = int(round((b / 31) * 255))
+    return rgb24
+
+
+def rgb565_to_png(size, in_path, out_path=None):
+    if out_path is None:
+        out_path = Path(in_path.stem + '.png')
+
+    rgb565 = read_rgb565(in_path)
+    rgb24 = rgb565_to_rgb24(rgb565)
+    image = Image.frombuffer("RGB", size, rgb24)
+    image.save(out_path)
+
+if __name__ == "__main__":
+    import sys
+
+    rgb565_to_png((320, 240), Path(sys.argv[1]))

ci/test.py

@@ -0,0 +1,53 @@
+# SPDX-FileCopyrightText: 2024-present Unital Software <[email protected]>
+#
+# SPDX-License-Identifier: MIT
+
+from pathlib import Path
+import os
+import subprocess
+import sys
+
+import click
+
+
+
+@click.command()
+def test():
+    """Run unit tests in micropython"""
+    print("Running Tests")
+    failures = []
+    test_dir = Path("tests/tempe")
+    os.environ["MICROPYPATH"] = "src:" + os.environ.get('MICROPYPATH', ":.frozen:~/.micropython/lib:/usr/lib/micropython")
+    for path in sorted(test_dir.glob("*.py")):
+        print(path.name, "... ", end="", flush=True)
+        result = run_test(path)
+        if result:
+            failures.append(result)
+            print('FAILED')
+        else:
+            print('OK')
+    print()
+
+    for path, stdout, stderr in failures:
+        print("FAILURE: ", path.name)
+        print("STDOUT ", "="*70)
+        print(stdout.decode('utf-8'))
+        print()
+        print("STDERR ", "="*70)
+        print(stderr.decode('utf-8'))
+        print()
+
+    if failures:
+        sys.exit(1)
+    else:
+        print("PASSED")
+
+
+def run_test(path):
+    try:
+        result = subprocess.run(["micropython", path], capture_output=True, check=True)
+    except subprocess.CalledProcessError as exc:
+        return (path, exc.stdout, exc.stderr)
+
+if __name__ == "__main__":
+    test()