stages(kickstart): add test for schema validation

stages/test/test_kickstart.py

@@ -4,6 +4,7 @@
 
 import pytest
 
+import osbuild.meta
 from osbuild.testutil.imports import import_module_from_path
 
 
@@ -30,3 +31,32 @@ def test_kickstart(tmp_path, test_input, expected):
     with open(os.path.join(tmp_path, ks_path), encoding="utf-8") as fp:
         ks_content = fp.read()
     assert ks_content == expected + "\n"
+
+
+@pytest.mark.parametrize("test_user,expected_err", [
+    ("user;invalid", "'user;invalid' does not match any of the regexes:"),
+])
+def test_schema_validation_regression_user(test_user, expected_err):
+    name = "org.osbuild.kickstart"
+    root = os.path.join(os.path.dirname(__file__), "../..")
+    mod_info = osbuild.meta.ModuleInfo.load(root, "Stage", name)
+    schema = osbuild.meta.Schema(mod_info.get_schema(), name)
+
+    test_input = {
+        "name": "org.osbuild.kickstart",
+        "options": {
+            "path": "some-path",
+            "users": {
+                test_user: {
+                    "uid": 1000,
+                }
+            }
+        }
+    }
+    res = schema.validate(test_input)
+
+    assert res.valid == False
+    assert len(res.errors) == 1
+    err_msgs = [e.as_dict()["message"] for e in res.errors]
+    assert expected_err in err_msgs[0]
+