diff --git a/rust/sword/src/jets/cold.rs b/rust/sword/src/jets/cold.rs
index 79033a2..2bbded5 100644
--- a/rust/sword/src/jets/cold.rs
+++ b/rust/sword/src/jets/cold.rs
@@ -1176,7 +1176,9 @@ impl Nounable for Cold {
 }
 
 #[cfg(test)]
-mod test {
+pub(crate) mod test {
+    use std::iter::FromIterator;
+
     use super::*;
     use crate::{
         hamt::Hamt,
@@ -1184,8 +1186,9 @@ mod test {
         noun::{Cell, Noun, D},
     };
 
-    fn make_test_stack() -> NockStack {
-        let size = 1 << 27;
+    /// Default stack size for tests where you aren't intending to run out of space
+    pub(crate) const DEFAULT_STACK_SIZE: usize = 1 << 27;
+    pub(crate) fn make_test_stack(size: usize) -> NockStack {
         let top_slots = 100;
         let stack = NockStack::new(size, top_slots);
         stack
@@ -1221,7 +1224,7 @@ mod test {
 
     #[test]
     fn cold_bidirectional_conversion() {
-        let mut stack = make_test_stack();
+        let mut stack = make_test_stack(DEFAULT_STACK_SIZE);
         let cold = make_cold_state(&mut stack);
         let cold_noun = cold.into_noun(&mut stack);
         let new_cold =
@@ -1311,7 +1314,7 @@ mod test {
 
     #[test]
     fn hamt_bidirectional_conversion() {
-        let mut stack = make_test_stack();
+        let mut stack = make_test_stack(DEFAULT_STACK_SIZE);
         let items = vec![(D(0), D(1)), (D(2), D(3))];
         let hamt = super::hamt_from_vec(&mut stack, items);
         let noun = hamt.into_noun(&mut stack);
@@ -1364,7 +1367,7 @@ mod test {
 
     #[test]
     fn batteries_list_bidirectional_conversion() {
-        let mut stack = make_test_stack();
+        let mut stack = make_test_stack(DEFAULT_STACK_SIZE);
         let batteries_list2 = make_batteries_list(&mut stack, &[1, 2]);
         let batteries_list_noun = batteries_list2.into_noun(&mut stack);
         let new_batteries_list2 = BatteriesList::from_noun(&mut stack, &batteries_list_noun)
@@ -1405,7 +1408,7 @@ mod test {
 
     #[test]
     fn batteries_bidirectional_conversion() {
-        let mut stack = make_test_stack();
+        let mut stack = make_test_stack(DEFAULT_STACK_SIZE);
         let batteries2 = make_batteries(&mut stack);
         let batteries_noun = batteries2.into_noun(&mut stack);
         let new_batteries = Batteries::from_noun(&mut stack, &batteries_noun)
@@ -1438,7 +1441,7 @@ mod test {
 
     #[test]
     fn tuple_bidirectional_conversion() {
-        let mut stack = make_test_stack();
+        let mut stack = make_test_stack(DEFAULT_STACK_SIZE);
         let tup = (D(1), D(2), D(3));
         let noun = tup.into_noun(&mut stack);
         let new_tup: (Noun, Noun, Noun) =
@@ -1461,14 +1464,15 @@ mod test {
         );
     }
 
-    fn make_noun_list(stack: &mut NockStack, v: &[u64]) -> NounList {
+    pub(crate) fn make_noun_list(stack: &mut NockStack, v: &[u64]) -> NounList {
         let mut noun_list = NOUN_LIST_NIL;
-        for &item in v.iter().rev() {
+        // let mut prev = noun_list;
+        for &item in v.iter() {
             let noun_list_mem: *mut NounListMem = unsafe { stack.alloc_struct(1) };
             unsafe {
                 noun_list_mem.write(NounListMem {
                     element: D(item),
-                    next: NOUN_LIST_NIL,
+                    next: noun_list,
                 });
             }
             noun_list = NounList(noun_list_mem);
@@ -1478,16 +1482,21 @@ mod test {
 
     #[test]
     fn noun_list_bidirectional_conversion() {
-        let mut stack = make_test_stack();
-        let items = vec![D(1), D(2)];
-        let noun_list = make_noun_list(&mut stack, &[1, 2]);
+        let mut stack = make_test_stack(DEFAULT_STACK_SIZE);
+        const ITEM_COUNT: u64 = 2;
+        let vec = Vec::from_iter(1..=ITEM_COUNT);
+        let items = vec.iter().map(|&x| D(x)).collect::<Vec<Noun>>();
+        let slice = vec.as_slice();
+        let noun_list = make_noun_list(&mut stack, slice);
         let noun = noun_list.into_noun(&mut stack);
         let new_noun_list: NounList =
             <NounList as Nounable>::from_noun::<NockStack>(&mut stack, &noun).unwrap();
+        let mut item_count = 0;
         for (a, b) in new_noun_list.zip(items.iter()) {
             let a_ptr = a;
             let b_ptr = &mut b.clone() as *mut Noun;
             let a_val = unsafe { *a_ptr };
+            item_count += 1;
             assert!(
                 unsafe { unifying_equality(&mut stack, a_ptr, b_ptr) },
                 "Items don't match: {:?} {:?}",
@@ -1495,11 +1504,12 @@ mod test {
                 b
             );
         }
+        assert_eq!(item_count, ITEM_COUNT as usize);
     }
 
     #[test]
     fn how_to_noun() {
-        let mut stack = make_test_stack();
+        let mut stack = make_test_stack(DEFAULT_STACK_SIZE);
         let tup: &[Noun] = &[D(0), D(1)];
         let cell = Cell::new_tuple(&mut stack, tup);
         let noun: Noun = cell.as_noun();
@@ -1511,7 +1521,7 @@ mod test {
 
     #[test]
     fn how_to_noun_but_listy() {
-        let mut stack = make_test_stack();
+        let mut stack = make_test_stack(DEFAULT_STACK_SIZE);
         let tup: &[Noun] = &[D(0), D(1)];
         let cell = Cell::new_tuple(&mut stack, tup);
         let noun: Noun = cell.as_noun();