add a test for a non self-evaluating expression

src/lem/multiframe.rs

@@ -895,6 +895,7 @@ where
 
 #[cfg(test)]
 mod tests {
+    use bellpepper_core::test_cs::TestConstraintSystem;
     use pasta_curves::Fq;
 
     use crate::{
@@ -1014,4 +1015,33 @@ mod tests {
             assert_eq!(x.hash().get_value(), y.hash().get_value());
         }
     }
+
+    #[test]
+    fn non_self_evaluating() {
+        let store = Store::default();
+
+        // not self-evaluating
+        let expr = store.read_with_default_state("(+ 1 2)").unwrap();
+
+        let lang = Arc::new(Lang::<Fq, Coproc<Fq>>::new());
+        let (mut frames, _) = evaluate::<Fq, Coproc<Fq>>(None, expr, &store, 1).unwrap();
+        assert_eq!(frames.len(), 1);
+
+        let mut frame = frames.pop().unwrap();
+        // faking a trivial evaluation frame
+        frame.output = vec![expr, store.intern_nil(), store.cont_terminal()];
+
+        let mut cs = TestConstraintSystem::<Fq>::new();
+
+        let folding_config = Arc::new(FoldingConfig::new_ivc(lang.clone(), 1));
+
+        store.hydrate_z_cache();
+        MultiFrame::from_frames(1, &[frame], &store, &folding_config)
+            .pop()
+            .unwrap()
+            .synthesize(&mut cs)
+            .unwrap();
+
+        assert!(!cs.is_satisfied());
+    }
 }