fix: Boolean 构造器对象臂按 B.3.4 特判 DDA 宿主对象为 falsy

crates/oxide_builtins/tests/boolean_tests.rs

@@ -0,0 +1,32 @@
+use std::sync::Arc;
+
+use oxide_compiler::compiler::Compiler;
+use oxide_types::value::JsValue;
+use oxide_vm::vm::Vm;
+
+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 error: {:?}", e))?;
+    let module = Compiler::new().compile(&program).map_err(|e| format!("Compile error: {}", e))?;
+    let mut vm = Vm::new();
+    vm.run(&Arc::new(module))
+}
+
+/// 求值一个应得布尔结果的表达式并断言其类型。
+fn eval_bool(source: &str) -> bool {
+    let result = eval(source).expect("eval should succeed");
+    assert!(result.is_bool(), "expected boolean result, got {result:?}");
+    result.as_bool()
+}
+
+/// [[IsHTMLDDA]] 宿主对象按 undefined 处理（B.3.4），Boolean() 应返 false。
+#[test]
+fn boolean_html_dda_is_falsy() {
+    assert!(!eval_bool("Boolean($262.IsHTMLDDA)"));
+}
+
+/// 普通对象在 ToBoolean 下保持 truthy。
+#[test]
+fn boolean_plain_object_is_truthy() {
+    assert!(eval_bool("Boolean({})"));
+}