Stage Hub full updates for next reboot

app/tests/test_hub_update_boot_staging.py

@@ -0,0 +1,40 @@
+import unittest
+from pathlib import Path
+
+
+HUB_NIX = Path(__file__).resolve().parents[2] / "modules" / "core" / "sovran-hub.nix"
+
+
+def _section(source: str, start: str, end: str) -> str:
+    start_idx = source.index(start)
+    end_idx = source.index(end, start_idx)
+    return source[start_idx:end_idx]
+
+
+class HubUpdateBootStagingTests(unittest.TestCase):
+    def setUp(self):
+        self.source = HUB_NIX.read_text()
+        self.update_section = _section(
+            self.source,
+            'update-script = pkgs.writeShellScript "sovran-hub-update.sh" \'\'',
+            "# ── Rebuild wrapper script",
+        )
+        self.rebuild_section = _section(
+            self.source,
+            'rebuild-script = pkgs.writeShellScript "sovran-hub-rebuild.sh" \'\'',
+            "# ── Brave launcher wrapper",
+        )
+
+    def test_full_update_uses_boot_not_switch(self):
+        self.assertIn("nixos-rebuild boot --flake /etc/nixos", self.update_section)
+        self.assertNotIn("nixos-rebuild switch --flake /etc/nixos", self.update_section)
+
+    def test_full_update_marks_reboot_required(self):
+        self.assertIn('echo "REBOOT_REQUIRED" > "$STATUS"', self.update_section)
+
+    def test_rebuild_path_keeps_switch_semantics(self):
+        self.assertIn("nixos-rebuild switch --flake /etc/nixos", self.rebuild_section)
+
+
+if __name__ == "__main__":
+    unittest.main()