feat: 搭建原生函数基础设施

crates/oxide_vm/tests/builtins_globals_tests.rs

@@ -0,0 +1,39 @@
+use oxide_compiler::compiler::Compiler;
+use oxide_parser::Allocator;
+use oxide_vm::vm::Vm;
+
+fn eval(source: &str) -> Result<oxide_types::value::JsValue, String> {
+    let allocator = 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(&module)
+}
+
+#[test]
+fn eval_nan_returns_nan() {
+    let result = eval("NaN").unwrap();
+    assert!(result.is_double());
+    assert!(result.as_double().is_nan());
+}
+
+#[test]
+fn eval_undefined_returns_undefined() {
+    let result = eval("undefined").unwrap();
+    assert!(result.is_undefined());
+}
+
+#[test]
+fn typeof_nan_is_number() {
+    let result = eval("typeof NaN").unwrap();
+    assert!(result.is_string());
+}
+
+#[test]
+fn typeof_undefined_is_undefined() {
+    let result = eval("typeof undefined").unwrap();
+    assert!(result.is_string());
+}