1 files changed, 45 insertions, 0 deletions
diff --git a/tvix/eval/builtin-macros/tests/tests.rs b/tvix/eval/builtin-macros/tests/tests.rs
new file mode 100644
index 000000000000..288b6670e119
--- /dev/null
+++ b/tvix/eval/builtin-macros/tests/tests.rs
@@ -0,0 +1,45 @@
+pub use tvix_eval::{Builtin, Value};
+use tvix_eval_builtin_macros::builtins;
+
+#[builtins]
+mod builtins {
+    use tvix_eval::generators::{Gen, GenCo};
+    use tvix_eval::{ErrorKind, Value};
+
+    /// Test docstring.
+    ///
+    /// It has multiple lines!
+    #[builtin("identity")]
+    pub async fn builtin_identity(co: GenCo, x: Value) -> Result<Value, ErrorKind> {
+        Ok(x)
+    }
+
+    #[builtin("tryEval")]
+    pub async fn builtin_try_eval(_co: GenCo, #[lazy] _x: Value) -> Result<Value, ErrorKind> {
+        unimplemented!("builtin is never called")
+    }
+}
+
+#[test]
+fn builtins() {
+    let builtins = builtins::builtins();
+    assert_eq!(builtins.len(), 2);
+
+    let (_, identity) = builtins
+        .iter()
+        .find(|(name, _)| *name == "identity")
+        .unwrap();
+
+    match identity {
+        Value::Builtin(identity) => assert_eq!(
+            identity.documentation(),
+            Some(
+                r#" Test docstring.
+
+ It has multiple lines!"#
+            )
+        ),
+
+        _ => panic!("builtin was not a builtin"),
+    }
+}