03-oct: superguardado automático

tests/test_lock.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+"""Tests de `monitor_estado.lock` — instancia unica (RF-22)."""
+
+import json
+
+import monitor_estado.lock as lock
+
+
+def test_lock_impide_segunda_instancia(tmp_path, monkeypatch):
+    """Una segunda adquisicion con la primera viva debe fallar (RF-22)."""
+    monkeypatch.setattr(lock, "LOCK_PATH", tmp_path / ".lock")
+
+    assert lock.adquirir() is True
+    # Misma PID viva -> la segunda instancia no arranca.
+    assert lock.adquirir() is False
+
+    lock.liberar()
+    assert not (tmp_path / ".lock").exists()
+    assert lock.adquirir() is True
+    lock.liberar()
+
+
+def test_lock_recupera_lock_caducado(tmp_path, monkeypatch):
+    """Un lock de un PID muerto no debe bloquear (se recupera)."""
+    ruta = tmp_path / ".lock"
+    monkeypatch.setattr(lock, "LOCK_PATH", ruta)
+    ruta.write_text(json.dumps({"pid": 999999, "arranque": "2026-01-01T00:00:00"}), encoding="utf-8")
+
+    assert lock.adquirir() is True
+    lock.liberar()
+
+
+def test_lock_liberar_no_borra_lock_ajeno(tmp_path, monkeypatch):
+    """`liberar` solo elimina el lock si es de nuestro propio PID."""
+    ruta = tmp_path / ".lock"
+    monkeypatch.setattr(lock, "LOCK_PATH", ruta)
+    ruta.write_text(json.dumps({"pid": 999999, "arranque": "x"}), encoding="utf-8")
+
+    lock.liberar()
+    assert ruta.exists()  # no era nuestro -> se respeta