Backups: collection interval is actually readable

tests/test_plugins/test_backups.py

@@ -847,3 +847,18 @@ def test_retention_prunes_each_pc_separately(bk_app, bk_plugin):
         rows = _db.session.query(BackupRevision).all()
         sources = [row.sourcehostname for row in rows]
         assert 'QUIET' in sources, 'the quiet PC lost its only backup'
+
+
+def test_the_collection_interval_is_readable_without_a_login(bk_app):
+    """The collecting script reads backups_intervalhours from
+    /api/settings/public before it holds any credential, and its
+    Get-IntervalHours falls back to 24 on ANY failure - silently. Off the
+    allowlist, the setting looks configurable in the UI and is not: every PC
+    keeps using 24. The share root must NOT be public; it is internal topology.
+    """
+    from plugins.backups.plugin import BackupsPlugin
+
+    declared = {entry['key']: entry for entry in
+                BackupsPlugin().get_settings_defaults()}
+    assert declared['backups_intervalhours'].get('public') is True
+    assert not declared['backups_shareroot'].get('public')