test(eval): add test for deep force key order

This tests deep forcing happens in lexicographic key order, by comparing
the returned error from the evaluator. It's not possible to observe this
from inside nixlang, which is why we use one_offs.rs here.

Change-Id: I73085addca3a4df20bc23f9fced458758af5b391
Reviewed-on: https://cl.snix.dev/c/snix/+/30488
Reviewed-by: Bence Nemes <nemes.bence1@gmail.com>
Tested-by: besadii
Autosubmit: Florian Klink <flokli@flokli.de>

snix/Cargo.nix

@@ -14281,6 +14281,7 @@ rec {
           {
             name = "pretty_assertions";
             packageId = "pretty_assertions";
+            features = [ "unstable" ];
           }
           {
             name = "rstest";

snix/eval/Cargo.toml

@@ -41,7 +41,7 @@ thiserror.workspace = true
 criterion.workspace = true
 itertools.workspace = true
 mimalloc.workspace = true
-pretty_assertions.workspace = true
+pretty_assertions = { workspace = true, features = ["unstable"] }
 rstest.workspace = true
 tempfile.workspace = true
 

snix/eval/src/tests/one_offs.rs

@@ -1,4 +1,5 @@
 use crate::*;
+use pretty_assertions::assert_matches;
 
 #[test]
 fn test_source_builtin() {
@@ -37,3 +38,26 @@ fn skip_broken_bytecode() {
         ErrorKind::UnknownStaticVariable
     ));
 }
+
+/// Checks that deep forcing happens in lexicographic key order
+/// See https://cl.snix.dev/c/snix/+/30309/comment/a7c9c6d5_bacf7332/ for
+/// details.
+#[test]
+fn key_order_deep_force() {
+    let result = Evaluation::builder_pure().build().evaluate(
+        /* code = */
+        r#"builtins.toXML {
+          c = throw "ccc";
+          a = throw "aaa";
+          b = throw "bbb";
+          d = throw "dd";
+        }"#,
+        None,
+    );
+    assert_eq!(result.errors.len(), 1);
+
+    assert_matches!(
+        &result.errors[0].kind,
+        ErrorKind::CatchableError(CatchableErrorKind::Throw(s)) if s.as_ref() == "\"aaa\""
+    );
+}