fix: 修复不符合 JS 语义约束的错误行为测试

crates/oxide_vm/tests/builtins_object_tests.rs

@@ -166,7 +166,8 @@ fn object_proto_has_own_property_call_works() {
 #[test]
 fn object_proto_property_is_enumerable_call_works() {
     let (_vm, result) = eval("Object.prototype.propertyIsEnumerable.call(Object, 'assign')").unwrap();
-    assert_eq!(result, JsValue::bool(true));
+    // Built-in methods are non-enumerable per the ES spec.
+    assert_eq!(result, JsValue::bool(false));
 }
 
 #[test]

crates/oxide_vm/tests/control_flow_tests.rs

@@ -159,12 +159,12 @@ fn eval_do_while_continue() {
 
 #[test]
 fn eval_for_in_enumerates_keys() {
-    assert_eq!(eval("var n=0; for (k in {a:1,b:2}) { n=n+1; } n"), "3");
+    assert_eq!(eval("var n=0; for (k in {a:1,b:2}) { n=n+1; } n"), "2");
 }
 
 #[test]
 fn eval_for_in_empty_object() {
-    assert_eq!(eval("var r=0; for (k in {}) { r=1; } r"), "1");
+    assert_eq!(eval("var r=0; for (k in {}) { r=1; } r"), "0");
 }
 
 #[test]
@@ -175,7 +175,7 @@ fn eval_for_in_non_object_throws() {
 
 #[test]
 fn eval_for_in_nested() {
-    assert_eq!(eval("var r=0; for (k in {a:{x:1}}) { for (j in {y:2}) { r=r+1; } } r"), "2");
+    assert_eq!(eval("var r=0; for (k in {a:{x:1}}) { for (j in {y:2}) { r=r+1; } } r"), "1");
 }
 
 #[test]
@@ -185,7 +185,7 @@ fn eval_for_in_break() {
 
 #[test]
 fn eval_for_in_continue() {
-    assert_eq!(eval("var r=0; for (k in {a:1,b:2}) { if (k=='a') continue; r=r+1; } r"), "2");
+    assert_eq!(eval("var r=0; for (k in {a:1,b:2}) { if (k=='a') continue; r=r+1; } r"), "1");
 }
 
 #[test]

crates/oxide_vm/tests/regression_tests.rs

@@ -104,8 +104,8 @@ fn regression_throw_statement_preserves_syntax_error_kind() {
 fn regression_for_in_prototype_chain() {
     assert_eq!(
         eval("var c=0;for(var k in {a:1}){c=c+1;}c"),
-        "2",
-        "for-in should include inherited constructor from prototype"
+        "1",
+        "for-in must not include non-enumerable prototype properties like constructor"
     );
 }