1 files changed, 100 insertions, 0 deletions
diff --git a/tvix/eval/src/value/attrs/tests.rs b/tvix/eval/src/value/attrs/tests.rs
new file mode 100644
index 000000000000..d7e2f113ebdf
--- /dev/null
+++ b/tvix/eval/src/value/attrs/tests.rs
@@ -0,0 +1,100 @@
+use bstr::B;
+
+use super::*;
+
+#[test]
+fn test_empty_attrs() {
+    let attrs = NixAttrs::construct(0, vec![]).expect("empty attr construction should succeed");
+
+    assert!(
+        matches!(attrs, NixAttrs(AttrsRep::Empty)),
+        "empty attribute set should use optimised representation"
+    );
+}
+
+#[test]
+fn test_simple_attrs() {
+    let attrs = NixAttrs::construct(1, vec![Value::from("key"), Value::from("value")])
+        .expect("simple attr construction should succeed");
+
+    assert!(
+        matches!(attrs, NixAttrs(AttrsRep::Im(_))),
+        "simple attribute set should use map representation",
+    )
+}
+
+#[test]
+fn test_kv_attrs() {
+    let name_val = Value::from("name");
+    let value_val = Value::from("value");
+    let meaning_val = Value::from("meaning");
+    let forty_two_val = Value::Integer(42);
+
+    let kv_attrs = NixAttrs::construct(
+        2,
+        vec![
+            value_val,
+            forty_two_val.clone(),
+            name_val,
+            meaning_val.clone(),
+        ],
+    )
+    .expect("constructing K/V pair attrs should succeed");
+
+    match kv_attrs {
+        NixAttrs(AttrsRep::KV { name, value })
+            if name.to_str().unwrap() == meaning_val.to_str().unwrap()
+                || value.to_str().unwrap() == forty_two_val.to_str().unwrap() => {}
+
+        _ => panic!(
+            "K/V attribute set should use optimised representation, but got {:?}",
+            kv_attrs
+        ),
+    }
+}
+
+#[test]
+fn test_empty_attrs_iter() {
+    let attrs = NixAttrs::construct(0, vec![]).unwrap();
+    assert!(attrs.iter().next().is_none());
+}
+
+#[test]
+fn test_kv_attrs_iter() {
+    let name_val = Value::from("name");
+    let value_val = Value::from("value");
+    let meaning_val = Value::from("meaning");
+    let forty_two_val = Value::Integer(42);
+
+    let kv_attrs = NixAttrs::construct(
+        2,
+        vec![
+            value_val,
+            forty_two_val.clone(),
+            name_val,
+            meaning_val.clone(),
+        ],
+    )
+    .expect("constructing K/V pair attrs should succeed");
+
+    let mut iter = kv_attrs.iter().collect::<Vec<_>>().into_iter();
+    let (k, v) = iter.next().unwrap();
+    assert!(k == *NAME_REF);
+    assert!(v.to_str().unwrap() == meaning_val.to_str().unwrap());
+    let (k, v) = iter.next().unwrap();
+    assert!(k == *VALUE_REF);
+    assert!(v.as_int().unwrap() == forty_two_val.as_int().unwrap());
+    assert!(iter.next().is_none());
+}
+
+#[test]
+fn test_map_attrs_iter() {
+    let attrs = NixAttrs::construct(1, vec![Value::from("key"), Value::from("value")])
+        .expect("simple attr construction should succeed");
+
+    let mut iter = attrs.iter().collect::<Vec<_>>().into_iter();
+    let (k, v) = iter.next().unwrap();
+    assert!(k == &NixString::from("key"));
+    assert_eq!(v.to_str().unwrap(), B("value"));
+    assert!(iter.next().is_none());
+}