feat: 支持 to_string 与错误栈

crates/oxide_vm/tests/builtins_error_tests.rs

@@ -1,3 +1,5 @@
+use oxide_compiler::compiler::Compiler;
+use oxide_types::value::JsValue;
 use oxide_vm::builtins::error;
 use oxide_vm::vm::Vm;
 
@@ -5,6 +7,14 @@ fn make_vm() -> Vm {
     Vm::new()
 }
 
+fn eval(source: &str) -> Result<JsValue, String> {
+    let allocator = oxide_parser::Allocator::default();
+    let program = oxide_parser::parse(&allocator, source).map_err(|e| format!("Parse: {}", e))?;
+    let module = Compiler::new().compile(&program).map_err(|e| format!("Compile: {}", e))?;
+    let mut vm = make_vm();
+    vm.run(&module)
+}
+
 #[test]
 fn error_constructor_creates_object() {
     let mut vm = make_vm();
@@ -107,3 +117,21 @@ fn error_name_is_string_property() {
     let n = obj.prop_count();
     assert!(n >= 2);
 }
+
+#[test]
+fn error_to_string_returns_string() {
+    let result = eval("new Error('test').toString()").unwrap();
+    assert!(result.is_string());
+}
+
+#[test]
+fn type_error_is_defined() {
+    let result = eval("typeof TypeError").unwrap();
+    assert!(result.is_string());
+}
+
+#[test]
+fn reference_error_is_defined() {
+    let result = eval("typeof ReferenceError").unwrap();
+    assert!(result.is_string());
+}