stages: add test for bootc.install-to-filesystem

stages/test/test_bootc_install_to_fs.py

@@ -0,0 +1,50 @@
+#!/usr/bin/python3
+
+import os.path
+from contextlib import contextmanager
+from unittest.mock import patch
+
+from osbuild.testutil.imports import import_module_from_path
+
+
+@patch("subprocess.run")
+def test_bootc_install_to_fs(mock_run, tmp_path):
+    stage_path = os.path.join(os.path.dirname(__file__), "../org.osbuild.bootc.install-to-filesystem")
+    stage = import_module_from_path("bootc_install_to_fs_stage", stage_path)
+
+    inputs = {
+        "images": {
+            "path": "/input/images/path",
+            "data": {
+                "archives": {
+                    "/input/images/path": {
+                        "format": "oci-archive",
+                        "name": "some-img-name",
+                    },
+                },
+            },
+        },
+    }
+    mounts = {
+        "root": {
+            "path": "/path/to/root",
+        },
+    }
+
+    @contextmanager
+    def faked_tmp_dir():
+        yield tmp_path
+    with patch("tempfile.TemporaryDirectory", side_effect=faked_tmp_dir):
+        stage.main(inputs, mounts)
+
+    assert len(mock_run.call_args_list) == 1
+    args = mock_run.call_args_list[0].args
+    assert len(args) == 1
+    assert args[0] == [
+        "bootc", "install", "to-filesystem",
+        "--source-imgref", f"oci-archive:{tmp_path}/image",
+        "--skip-fetch-check", "--generic-image",
+        "/path/to/root",
+    ]
+    kwargs = mock_run.call_args_list[0].kwargs
+    assert kwargs["check"] is True