chore: checkpoint before Python removal

vendor/kube-derive/tests/test_ui.rs

@@ -0,0 +1,10 @@
+// Test that `kube-derive` outputs helpful error messages.
+// If you make a change, remove `tests/ui/*.stderr` and run `cargo test`.
+// Then copy the files that appear under `wip/` if it's what you expected.
+// Alternatively, run `TRYBUILD=overwrite cargo test`.
+// See https://github.com/dtolnay/trybuild
+#[test]
+fn test_failures() {
+    let t = trybuild::TestCases::new();
+    t.compile_fail("tests/ui/*.rs");
+}