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 +31,30 @@ 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"
+
+
+def test_schema_validation():
+    ks_stage_path = os.path.join(os.path.dirname(__file__), "../org.osbuild.kickstart")
+    ks_stage = import_module_from_path("ks_stage", ks_stage_path)
+
+    name = "org.osbuild.kickstart"
+    version = "1"
+    import json
+    json_schema = json.loads("{"+ks_stage.SCHEMA+"}")
+    schema = osbuild.meta.Schema(json_schema, name)
+    print(schema)
+    test_input = {
+        "path": "some-path",
+        "users": {
+            "foo;rm -rf": {
+                "uid": 1000,
+            }
+        }
+    }
+    res = schema.validate(test_input)
+    assert res.valid == False
+    assert len(res.errors) == 1
+    for err in res.errors:
+        err_msg = err.as_dict()["message"]
+        assert "'foo;rm -rf' does not match any of the regexes:" in err_msg
+