test: convert test_manifest_disk_customization_lvm to TOML

By moving the LVM disk customization test to TOML we will
catch issues with our TOML parsing early, i.e. we can
catch the regression we encountered when applying strict
TOML parsing. This is also tested in
osbuild/blueprint#12 but having
it here again for good measure is a good idea.

Author: mvo5

test/test_manifest.py

@@ -608,33 +608,23 @@ def test_manifest_disk_customization_lvm(tmp_path, build_container):
     container_ref = "quay.io/centos-bootc/centos-bootc:stream9"
     testutil.pull_container(container_ref)
 
-    config = {
-        "customizations": {
-            "disk": {
-                "partitions": [
-                    {
-                        "type": "lvm",
-                        "minsize": "10 GiB",
-                        "logical_volumes": [
-                            {
-                                "minsize": "10 GiB",
-                                "fs_type": "ext4",
-                                "mountpoint": "/",
-                            }
-                        ]
-                    }
-                ]
-            }
-        }
-    }
-    config_path = tmp_path / "config.json"
-    with config_path.open("w") as config_file:
-        json.dump(config, config_file)
+    config = textwrap.dedent("""\
+    [[customizations.disk.partitions]]
+    type = "lvm"
+    minsize = "10 GiB"
+
+    [[customizations.disk.partitions.logical_volumes]]
+    minsize = "10 GiB"
+    fs_type = "ext4"
+    mountpoint = "/"
+    """)
+    config_path = tmp_path / "config.toml"
+    config_path.write_text(config)
 
     testutil.pull_container(container_ref)
     output = subprocess.check_output([
         *testutil.podman_run_common,
-        "-v", f"{config_path}:/config.json:ro",
+        "-v", f"{config_path}:/config.toml:ro",
         build_container,
         "manifest", f"{container_ref}",
     ])