feat: add miband bot application

tests/test_lock.py

@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import subprocess
+import sys
+from pathlib import Path
+
+import pytest
+
+from miband_tracker.lock import LockUnavailable, exclusive_file_lock
+
+
+def test_exclusive_file_lock_rejects_second_process(tmp_path: Path) -> None:
+    lock_path = tmp_path / "sync.lock"
+    script = (
+        "import sys, time\n"
+        "from pathlib import Path\n"
+        "from miband_tracker.lock import exclusive_file_lock\n"
+        "with exclusive_file_lock(Path(sys.argv[1])):\n"
+        "    print('ready', flush=True)\n"
+        "    time.sleep(5)\n"
+    )
+    proc = subprocess.Popen(
+        [sys.executable, "-c", script, str(lock_path)],
+        stdout=subprocess.PIPE,
+        text=True,
+    )
+    try:
+        assert proc.stdout is not None
+        assert proc.stdout.readline().strip() == "ready"
+        with pytest.raises(LockUnavailable):
+            with exclusive_file_lock(lock_path):
+                pass
+    finally:
+        proc.terminate()
+        proc.wait(timeout=5)