Initial pve cloud backup app

backend/tests/test_jobs.py

@@ -0,0 +1,21 @@
+from datetime import datetime, timezone
+
+import pytest
+
+from app.jobs import next_run, validate_cron
+
+
+def test_cron_validation_accepts_standard_expression():
+    validate_cron("0 2 * * *")
+    assert next_run("0 2 * * *")
+
+
+def test_cron_validation_rejects_invalid_expression():
+    with pytest.raises(ValueError):
+        validate_cron("not a cron")
+
+
+def test_next_run_interprets_cron_in_configured_timezone():
+    base = datetime(2026, 1, 1, 0, 0, tzinfo=timezone.utc)
+
+    assert next_run("0 2 * * *", base=base, timezone_name="Europe/Berlin") == "2026-01-01T01:00:00+00:00"