Add tests for yaml module registration and functions

Co-authored-by: Tcode-Motion <188012755+Tcode-Motion@users.noreply.github.com>

Author: google-labs-jules[bot]

stdlib/src/yaml.rs

@@ -66,3 +66,70 @@ impl StdlibRegistry {
         );
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::cell::RefCell;
+    use std::rc::Rc;
+    use techscript_runtime::RuntimeContext;
+    use indexmap::IndexMap;
+
+    #[test]
+    fn test_register_yaml() {
+        let mut registry = StdlibRegistry {
+            modules: std::collections::HashMap::new(),
+        };
+        registry.register_yaml();
+        assert!(registry.has_module("std.yaml"));
+    }
+
+    #[test]
+    fn test_yaml_parse() {
+        let mut registry = StdlibRegistry {
+            modules: std::collections::HashMap::new(),
+        };
+        registry.register_yaml();
+        let module = registry.get_module("std.yaml").unwrap();
+        let parse_func = module.exports.get("parse").unwrap();
+
+        let mut ctx = RuntimeContext::new(techscript_runtime::RuntimeConfig::default());
+        let yaml_str = RuntimeValue::Str("key1: value1\n# comment\nkey2: value2".to_string());
+
+        let result = parse_func.call(&mut ctx, vec![yaml_str]).unwrap();
+
+        if let RuntimeValue::Map { entries, .. } = result {
+            let entries = entries.borrow();
+            assert_eq!(entries.len(), 2);
+            assert_eq!(entries.get("key1").unwrap().try_into_string().unwrap(), "value1");
+            assert_eq!(entries.get("key2").unwrap().try_into_string().unwrap(), "value2");
+        } else {
+            panic!("Expected Map");
+        }
+    }
+
+    #[test]
+    fn test_yaml_stringify() {
+        let mut registry = StdlibRegistry {
+            modules: std::collections::HashMap::new(),
+        };
+        registry.register_yaml();
+        let module = registry.get_module("std.yaml").unwrap();
+        let stringify_func = module.exports.get("stringify").unwrap();
+
+        let mut ctx = RuntimeContext::new(techscript_runtime::RuntimeConfig::default());
+
+        let mut map = IndexMap::new();
+        map.insert("key1".to_string(), RuntimeValue::Str("value1".to_string()));
+        map.insert("key2".to_string(), RuntimeValue::Str("value2".to_string()));
+
+        let map_val = RuntimeValue::Map {
+            entries: Rc::new(RefCell::new(map)),
+            is_const: false,
+        };
+
+        let result = stringify_func.call(&mut ctx, vec![map_val]).unwrap();
+
+        assert_eq!(result.try_into_string().unwrap(), "key1: value1\nkey2: value2\n");
+    }
+}