Begin Firecracker microVM support

tests/test_dev_command_checks_integration.py

@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+from io import StringIO
+from unittest.mock import patch
+
+from django.core.management import call_command
+from django.test import override_settings
+
+
+@override_settings(DEBUG=True, TESTING=False)
+def test_dev_command_check_is_reported_by_check_command() -> None:
+    """System check must be visible through call_command without direct check import."""
+
+    def fake_which(command: str) -> str | None:
+        if command == "curl":
+            return None
+        return f"/usr/bin/{command}"
+
+    stderr = StringIO()
+    with patch("shutil.which", side_effect=fake_which):
+        call_command("check", "-t", "compatibility", stderr=stderr)
+
+    output = stderr.getvalue()
+    assert "(tussilago.W001) Missing host commands used by get_rootfs.bash." in output
+    assert "Dev-only tooling missing: curl." in output
+
+
+@override_settings(DEBUG=False, TESTING=False)
+def test_dev_command_check_is_not_reported_in_production_runtime() -> None:
+    """Production runtime must not report dev-only tooling warning."""
+    stderr = StringIO()
+    with patch("shutil.which", return_value=None):
+        call_command("check", "-t", "compatibility", stderr=stderr)
+
+    assert "(tussilago.W001)" not in stderr.getvalue()