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test: 对象模块内联测试整块迁入兄弟测试文件

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彭俊皓
2026-09-15 18:05:00 +00:00
parent 66ad14159d
commit 875f6dac60
2 changed files with 311 additions and 312 deletions
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crates/oxide_types/src/object.rs
+1 -312
View File
@@ -2133,315 +2133,4 @@ impl JsObject {
}
#[cfg(test)]
mod tests {
use super::*;
use crate::shape::EMPTY_SHAPE_ID;
#[test]
fn object_size_bounds() {
let sz = std::mem::size_of::<JsObject>();
assert!(sz <= 256, "JsObject grew unexpectedly: {sz}B");
}
#[test]
fn js_string_cons_basic() {
// 左右子 Flat 构造 Cons：utf16_len/is_empty/文本视图全部按拼接语义。
let left = Box::new(JsString::new("ab".to_string()));
let right = Box::new(JsString::new("cd".to_string()));
let cons = Box::new(unsafe { JsString::new_cons(&*left, &*right) });
assert_eq!(cons.utf16_len(), 4);
assert!(!cons.is_empty());
assert_eq!(cons.as_lossy_str(), "abcd");
assert_eq!(cons.to_owned_string(), "abcd");
assert!(cons.is_cons());
// 扁平化产物缓存命中：内容仍一致（units 视图同样走缓存）。
assert_eq!(cons.as_lossy_str(), "abcd");
assert_eq!(cons.units().as_ref(), &['a' as u16, 'b' as u16, 'c' as u16, 'd' as u16]);
}
#[test]
fn js_string_layout_anchor_and_tags() {
// 32B 锚 + 三形态 tag/utf16_len 预写口径（布局变更先同步头注释再改断言）。
let flat = JsString::new("ab".to_string());
assert_eq!(std::mem::size_of::<JsString>(), 32);
assert!(flat.is_flat() && !flat.is_cons() && !flat.is_flat_u16());
assert_eq!(flat.tag, TAG_FLAT);
assert_eq!(flat.utf16_len(), 2);
assert_eq!(flat.payload_bytes(), 2);
let u16 = JsString::new_flat_u16(vec![0xD800, 0xDC00]);
assert!(u16.is_flat_u16());
assert_eq!(u16.tag, TAG_FLAT_U16);
assert_eq!(u16.utf16_len(), 2);
assert_eq!(u16.payload_bytes(), 4);
assert_eq!(u16.units_borrowed(), Some(&[0xD800, 0xDC00][..]));
// 代理对 well-formed：smart 路由落 Flat 且内容等价。
let smart = JsString::from_units(vec![0xD800, 0xDC00]);
assert!(smart.is_flat());
assert_eq!(smart.as_str(), "\u{10000}");
// 孤立 surrogate：smart 路由落 FlatU16。
let lone = JsString::from_units(vec![0xD800]);
assert!(lone.is_flat_u16());
assert!(lone.has_lone_surrogate());
assert_eq!(lone.units().as_ref(), &[0xD800]);
assert_eq!(lone.as_lossy_str(), "\u{FFFD}");
let left = Box::new(JsString::new("ab".to_string()));
let right = Box::new(JsString::new("cd".to_string()));
let cons = Box::new(unsafe { JsString::new_cons(&*left, &*right) });
assert!(cons.is_cons());
assert_eq!(cons.tag, TAG_CONS);
assert_eq!(cons.utf16_len(), 4, "Cons 单元长构造期 eager 归纳");
assert_eq!(cons.payload_bytes(), 8);
assert!(!cons.has_lone_surrogate());
// Cons 扁平化产物恒 FlatU16：units 零拷贝借用来自缓存。
let u16_node = cons.units().into_owned();
assert_eq!(u16_node, vec![0x61, 0x62, 0x63, 0x64]);
assert!(!cons.flat_cache_ptr().is_null());
unsafe { JsString::drop_cons_node(cons.cons_node_ptr()) };
}
#[test]
fn js_string_cons_deep_chain_flattens_iteratively() {
// 2000 层左倾链：显式栈展开不爆栈，产物与逐段拼接一致。
let mut nodes: Vec<Box<JsString>> = Vec::new();
nodes.push(Box::new(JsString::new("x".to_string())));
for _ in 0..2000 {
nodes.push(Box::new(JsString::new("y".to_string())));
}
let mut chain_ptr = nodes[0].as_ref() as *const JsString;
for i in 1..nodes.len() {
let cons = Box::new(unsafe { JsString::new_cons(chain_ptr, nodes[i].as_ref() as *const JsString) });
chain_ptr = cons.as_ref() as *const JsString;
nodes.push(cons);
}
let text = nodes.last().unwrap().as_lossy_str();
assert_eq!(text.len(), 1 + 2000);
assert!(text.starts_with('x'));
assert!(text.ends_with('y'));
}
#[test]
fn js_string_cons_empty_parts() {
// 双空串 Cons：空判定与长度均为 0，扁平化为空文本。
let left = Box::new(JsString::new(String::new()));
let right = Box::new(JsString::new(String::new()));
let cons = Box::new(unsafe { JsString::new_cons(&*left, &*right) });
assert!(cons.is_empty());
assert_eq!(cons.utf16_len(), 0);
assert_eq!(cons.as_lossy_str(), "");
}
#[test]
fn new_empty_defaults() {
let obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert_eq!(obj.shape_id(), EMPTY_SHAPE_ID);
assert_eq!(obj.prop_count(), 0);
assert!(obj.is_extensible());
assert!(!obj.is_array());
assert!(!obj.is_function());
assert!(!obj.is_session_epoch());
assert_eq!(obj.generation(), 1);
assert!(obj.hash_props_vec().is_none());
assert!(!obj.has_prop_meta());
}
#[test]
fn session_epoch_marker_roundtrip() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert!(!obj.is_session_epoch());
obj.set_session_epoch(true);
assert!(obj.is_session_epoch());
obj.set_session_epoch(false);
assert!(!obj.is_session_epoch());
}
#[test]
fn session_epoch_marker_preserves_gc_mark_bit() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert!(!obj.is_gc_marked());
obj.set_gc_mark(true);
assert!(obj.is_gc_marked());
assert!(!obj.is_session_epoch());
obj.set_session_epoch(true);
assert!(obj.is_session_epoch());
assert!(obj.is_gc_marked());
obj.set_gc_mark(false);
assert!(!obj.is_gc_marked());
}
#[test]
fn session_epoch_marker_keeps_object_size_bound() {
let sz = std::mem::size_of::<JsObject>();
assert!(sz <= 256, "JsObject grew unexpectedly: {sz}B");
}
#[test]
fn clone_for_session_epoch_marks_clone_and_does_not_alias_hash_props() {
let mut source = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
source.set_prop_at(0, JsValue::int(1));
let mut clone = source.clone_for_session_epoch();
assert!(clone.is_session_epoch());
clone.set_prop_at(0, JsValue::int(2));
assert_eq!(source.get_prop_at(0), JsValue::int(1));
assert_eq!(clone.get_prop_at(0), JsValue::int(2));
}
#[test]
fn clone_for_session_epoch_does_not_alias_prop_meta() {
let mut source = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
source.set_prop_at(0, JsValue::undefined());
source.set_accessor_meta(0, JsValue::int(10), JsValue::int(11), PropAttributes::DEFAULT_DATA);
let mut clone = source.clone_for_session_epoch();
clone.set_accessor_meta(0, JsValue::int(20), JsValue::int(21), PropAttributes::DEFAULT_DATA);
let source_meta = source.prop_meta_at(0).expect("source meta");
let clone_meta = clone.prop_meta_at(0).expect("clone meta");
assert_eq!(source_meta.get, JsValue::int(10));
assert_eq!(source_meta.set, JsValue::int(11));
assert_eq!(clone_meta.get, JsValue::int(20));
assert_eq!(clone_meta.set, JsValue::int(21));
}
#[test]
fn shape_id_roundtrip() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
obj.set_shape_id(0x00AB_CDEF);
assert_eq!(obj.shape_id(), 0x00AB_CDEF);
}
#[test]
fn prop_count_roundtrip() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert_eq!(obj.prop_count(), 0);
obj.ensure_hash_props().push(JsValue::int(17));
assert_eq!(obj.prop_count(), 1);
}
#[test]
fn flags_individual() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert!(obj.is_extensible());
obj.set_extensible(false);
assert!(!obj.is_extensible());
}
#[test]
fn hash_prop_read_write() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
obj.set_prop_at(0, JsValue::int(42));
assert_eq!(obj.get_prop_at(0), JsValue::int(42));
}
#[test]
fn new_array_flags() {
let bump = bumpalo::Bump::new();
let obj = JsObject::new_array(5, JsValue::null(), 3, &bump);
assert!(obj.is_array());
assert_eq!(obj.shape_id(), 5);
assert_eq!(obj.prop_count(), 3);
}
#[test]
fn generation_bump() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert_eq!(obj.generation(), 1);
obj.bump_generation();
assert_eq!(obj.generation(), 2);
}
#[test]
fn hash_props_lazy_init() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert!(obj.hash_props_vec().is_none());
assert_eq!(obj.prop_count(), 0);
obj.set_prop_at(0, JsValue::int(1));
assert!(obj.hash_props_vec().is_some());
assert_eq!(obj.prop_count(), 1);
}
#[test]
fn hash_props_flat_storage_roundtrip() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
obj.set_prop_at(0, JsValue::int(100));
obj.set_prop_at(1, JsValue::int(200));
assert_eq!(obj.get_prop_at(0), JsValue::int(100));
assert_eq!(obj.get_prop_at(1), JsValue::int(200));
}
#[test]
fn prop_meta_lazy_init() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
obj.set_prop_at(0, JsValue::int(1));
assert!(!obj.has_prop_meta());
obj.set_data_meta(0, PropAttributes::new(false, true, false));
assert!(obj.has_prop_meta());
let meta = obj.prop_meta_at(0).expect("meta");
assert!(!meta.is_accessor);
assert!(!meta.attributes.writable());
assert!(meta.attributes.enumerable());
assert!(!meta.attributes.configurable());
}
#[test]
fn accessor_meta_roundtrip_and_alignment() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
obj.set_prop_at(0, JsValue::int(1));
obj.set_accessor_meta(2, JsValue::int(10), JsValue::int(11), PropAttributes::new(false, false, true));
assert_eq!(obj.prop_count(), 3);
assert!(obj.is_accessor_meta(2));
let meta = obj.prop_meta_at(2).expect("accessor meta");
assert_eq!(meta.get, JsValue::int(10));
assert_eq!(meta.set, JsValue::int(11));
assert!(!meta.attributes.writable());
assert!(!meta.attributes.enumerable());
assert!(meta.attributes.configurable());
obj.push_prop(JsValue::int(4));
assert_eq!(obj.prop_meta_vec().expect("meta").len(), obj.prop_vec_len());
}
#[test]
fn array_element_write_preserves_props_after_element_growth() {
// 先写属性再 push 元素：元素区增长必须整体搬移属性区，不覆盖属性。
let bump = bumpalo::Bump::new();
let mut obj = JsObject::new_array(EMPTY_SHAPE_ID, JsValue::null(), 3, &bump);
obj.set_prop_shape(0, JsValue::int(99));
obj.set_prop_at(3, JsValue::int(4));
assert_eq!(obj.prop_count(), 4);
assert_eq!(obj.get_prop_at(3), JsValue::int(4));
assert_eq!(obj.get_prop_shape(0), JsValue::int(99));
}
#[test]
fn array_element_write_beyond_count_relocates_prop_zone() {
// 稀疏写入（越界索引）把属性区推到新元素之后，属性读取仍命中。
let bump = bumpalo::Bump::new();
let mut obj = JsObject::new_array(EMPTY_SHAPE_ID, JsValue::null(), 2, &bump);
obj.set_prop_shape(0, JsValue::int(7));
obj.set_prop_at(5, JsValue::int(50));
assert_eq!(obj.prop_count(), 6);
assert_eq!(obj.get_prop_at(5), JsValue::int(50));
assert_eq!(obj.get_prop_shape(0), JsValue::int(7));
}
#[test]
fn array_prop_count_truncate_keeps_prop_zone() {
// pop 截断元素区时属性区不得被删（meta 同步 insert/drain 对齐）。
let bump = bumpalo::Bump::new();
let mut obj = JsObject::new_array(EMPTY_SHAPE_ID, JsValue::null(), 3, &bump);
obj.set_prop_shape(0, JsValue::int(5));
obj.set_data_meta(3, PropAttributes::new(true, false, true));
obj.set_prop_count_fast(2);
assert_eq!(obj.prop_count(), 2);
assert_eq!(obj.get_prop_shape(0), JsValue::int(5));
assert!(obj.prop_meta_at(2).is_some());
}
}
mod tests;
crates/oxide_types/src/object/tests.rs
+310
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@@ -0,0 +1,310 @@
use super::*;
use crate::shape::EMPTY_SHAPE_ID;
#[test]
fn object_size_bounds() {
let sz = std::mem::size_of::<JsObject>();
assert!(sz <= 256, "JsObject grew unexpectedly: {sz}B");
}
#[test]
fn js_string_cons_basic() {
// 左右子 Flat 构造 Cons：utf16_len/is_empty/文本视图全部按拼接语义。
let left = Box::new(JsString::new("ab".to_string()));
let right = Box::new(JsString::new("cd".to_string()));
let cons = Box::new(unsafe { JsString::new_cons(&*left, &*right) });
assert_eq!(cons.utf16_len(), 4);
assert!(!cons.is_empty());
assert_eq!(cons.as_lossy_str(), "abcd");
assert_eq!(cons.to_owned_string(), "abcd");
assert!(cons.is_cons());
// 扁平化产物缓存命中：内容仍一致（units 视图同样走缓存）。
assert_eq!(cons.as_lossy_str(), "abcd");
assert_eq!(cons.units().as_ref(), &['a' as u16, 'b' as u16, 'c' as u16, 'd' as u16]);
}
#[test]
fn js_string_layout_anchor_and_tags() {
// 32B 锚 + 三形态 tag/utf16_len 预写口径（布局变更先同步头注释再改断言）。
let flat = JsString::new("ab".to_string());
assert_eq!(std::mem::size_of::<JsString>(), 32);
assert!(flat.is_flat() && !flat.is_cons() && !flat.is_flat_u16());
assert_eq!(flat.tag, TAG_FLAT);
assert_eq!(flat.utf16_len(), 2);
assert_eq!(flat.payload_bytes(), 2);
let u16 = JsString::new_flat_u16(vec![0xD800, 0xDC00]);
assert!(u16.is_flat_u16());
assert_eq!(u16.tag, TAG_FLAT_U16);
assert_eq!(u16.utf16_len(), 2);
assert_eq!(u16.payload_bytes(), 4);
assert_eq!(u16.units_borrowed(), Some(&[0xD800, 0xDC00][..]));
// 代理对 well-formed：smart 路由落 Flat 且内容等价。
let smart = JsString::from_units(vec![0xD800, 0xDC00]);
assert!(smart.is_flat());
assert_eq!(smart.as_str(), "\u{10000}");
// 孤立 surrogate：smart 路由落 FlatU16。
let lone = JsString::from_units(vec![0xD800]);
assert!(lone.is_flat_u16());
assert!(lone.has_lone_surrogate());
assert_eq!(lone.units().as_ref(), &[0xD800]);
assert_eq!(lone.as_lossy_str(), "\u{FFFD}");
let left = Box::new(JsString::new("ab".to_string()));
let right = Box::new(JsString::new("cd".to_string()));
let cons = Box::new(unsafe { JsString::new_cons(&*left, &*right) });
assert!(cons.is_cons());
assert_eq!(cons.tag, TAG_CONS);
assert_eq!(cons.utf16_len(), 4, "Cons 单元长构造期 eager 归纳");
assert_eq!(cons.payload_bytes(), 8);
assert!(!cons.has_lone_surrogate());
// Cons 扁平化产物恒 FlatU16：units 零拷贝借用来自缓存。
let u16_node = cons.units().into_owned();
assert_eq!(u16_node, vec![0x61, 0x62, 0x63, 0x64]);
assert!(!cons.flat_cache_ptr().is_null());
unsafe { JsString::drop_cons_node(cons.cons_node_ptr()) };
}
#[test]
fn js_string_cons_deep_chain_flattens_iteratively() {
// 2000 层左倾链：显式栈展开不爆栈，产物与逐段拼接一致。
let mut nodes: Vec<Box<JsString>> = Vec::new();
nodes.push(Box::new(JsString::new("x".to_string())));
for _ in 0..2000 {
nodes.push(Box::new(JsString::new("y".to_string())));
}
let mut chain_ptr = nodes[0].as_ref() as *const JsString;
for i in 1..nodes.len() {
let cons = Box::new(unsafe { JsString::new_cons(chain_ptr, nodes[i].as_ref() as *const JsString) });
chain_ptr = cons.as_ref() as *const JsString;
nodes.push(cons);
}
let text = nodes.last().unwrap().as_lossy_str();
assert_eq!(text.len(), 1 + 2000);
assert!(text.starts_with('x'));
assert!(text.ends_with('y'));
}
#[test]
fn js_string_cons_empty_parts() {
// 双空串 Cons：空判定与长度均为 0，扁平化为空文本。
let left = Box::new(JsString::new(String::new()));
let right = Box::new(JsString::new(String::new()));
let cons = Box::new(unsafe { JsString::new_cons(&*left, &*right) });
assert!(cons.is_empty());
assert_eq!(cons.utf16_len(), 0);
assert_eq!(cons.as_lossy_str(), "");
}
#[test]
fn new_empty_defaults() {
let obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert_eq!(obj.shape_id(), EMPTY_SHAPE_ID);
assert_eq!(obj.prop_count(), 0);
assert!(obj.is_extensible());
assert!(!obj.is_array());
assert!(!obj.is_function());
assert!(!obj.is_session_epoch());
assert_eq!(obj.generation(), 1);
assert!(obj.hash_props_vec().is_none());
assert!(!obj.has_prop_meta());
}
#[test]
fn session_epoch_marker_roundtrip() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert!(!obj.is_session_epoch());
obj.set_session_epoch(true);
assert!(obj.is_session_epoch());
obj.set_session_epoch(false);
assert!(!obj.is_session_epoch());
}
#[test]
fn session_epoch_marker_preserves_gc_mark_bit() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert!(!obj.is_gc_marked());
obj.set_gc_mark(true);
assert!(obj.is_gc_marked());
assert!(!obj.is_session_epoch());
obj.set_session_epoch(true);
assert!(obj.is_session_epoch());
assert!(obj.is_gc_marked());
obj.set_gc_mark(false);
assert!(!obj.is_gc_marked());
}
#[test]
fn session_epoch_marker_keeps_object_size_bound() {
let sz = std::mem::size_of::<JsObject>();
assert!(sz <= 256, "JsObject grew unexpectedly: {sz}B");
}
#[test]
fn clone_for_session_epoch_marks_clone_and_does_not_alias_hash_props() {
let mut source = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
source.set_prop_at(0, JsValue::int(1));
let mut clone = source.clone_for_session_epoch();
assert!(clone.is_session_epoch());
clone.set_prop_at(0, JsValue::int(2));
assert_eq!(source.get_prop_at(0), JsValue::int(1));
assert_eq!(clone.get_prop_at(0), JsValue::int(2));
}
#[test]
fn clone_for_session_epoch_does_not_alias_prop_meta() {
let mut source = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
source.set_prop_at(0, JsValue::undefined());
source.set_accessor_meta(0, JsValue::int(10), JsValue::int(11), PropAttributes::DEFAULT_DATA);
let mut clone = source.clone_for_session_epoch();
clone.set_accessor_meta(0, JsValue::int(20), JsValue::int(21), PropAttributes::DEFAULT_DATA);
let source_meta = source.prop_meta_at(0).expect("source meta");
let clone_meta = clone.prop_meta_at(0).expect("clone meta");
assert_eq!(source_meta.get, JsValue::int(10));
assert_eq!(source_meta.set, JsValue::int(11));
assert_eq!(clone_meta.get, JsValue::int(20));
assert_eq!(clone_meta.set, JsValue::int(21));
}
#[test]
fn shape_id_roundtrip() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
obj.set_shape_id(0x00AB_CDEF);
assert_eq!(obj.shape_id(), 0x00AB_CDEF);
}
#[test]
fn prop_count_roundtrip() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert_eq!(obj.prop_count(), 0);
obj.ensure_hash_props().push(JsValue::int(17));
assert_eq!(obj.prop_count(), 1);
}
#[test]
fn flags_individual() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert!(obj.is_extensible());
obj.set_extensible(false);
assert!(!obj.is_extensible());
}
#[test]
fn hash_prop_read_write() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
obj.set_prop_at(0, JsValue::int(42));
assert_eq!(obj.get_prop_at(0), JsValue::int(42));
}
#[test]
fn new_array_flags() {
let bump = bumpalo::Bump::new();
let obj = JsObject::new_array(5, JsValue::null(), 3, &bump);
assert!(obj.is_array());
assert_eq!(obj.shape_id(), 5);
assert_eq!(obj.prop_count(), 3);
}
#[test]
fn generation_bump() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert_eq!(obj.generation(), 1);
obj.bump_generation();
assert_eq!(obj.generation(), 2);
}
#[test]
fn hash_props_lazy_init() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
assert!(obj.hash_props_vec().is_none());
assert_eq!(obj.prop_count(), 0);
obj.set_prop_at(0, JsValue::int(1));
assert!(obj.hash_props_vec().is_some());
assert_eq!(obj.prop_count(), 1);
}
#[test]
fn hash_props_flat_storage_roundtrip() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
obj.set_prop_at(0, JsValue::int(100));
obj.set_prop_at(1, JsValue::int(200));
assert_eq!(obj.get_prop_at(0), JsValue::int(100));
assert_eq!(obj.get_prop_at(1), JsValue::int(200));
}
#[test]
fn prop_meta_lazy_init() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
obj.set_prop_at(0, JsValue::int(1));
assert!(!obj.has_prop_meta());
obj.set_data_meta(0, PropAttributes::new(false, true, false));
assert!(obj.has_prop_meta());
let meta = obj.prop_meta_at(0).expect("meta");
assert!(!meta.is_accessor);
assert!(!meta.attributes.writable());
assert!(meta.attributes.enumerable());
assert!(!meta.attributes.configurable());
}
#[test]
fn accessor_meta_roundtrip_and_alignment() {
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::null());
obj.set_prop_at(0, JsValue::int(1));
obj.set_accessor_meta(2, JsValue::int(10), JsValue::int(11), PropAttributes::new(false, false, true));
assert_eq!(obj.prop_count(), 3);
assert!(obj.is_accessor_meta(2));
let meta = obj.prop_meta_at(2).expect("accessor meta");
assert_eq!(meta.get, JsValue::int(10));
assert_eq!(meta.set, JsValue::int(11));
assert!(!meta.attributes.writable());
assert!(!meta.attributes.enumerable());
assert!(meta.attributes.configurable());
obj.push_prop(JsValue::int(4));
assert_eq!(obj.prop_meta_vec().expect("meta").len(), obj.prop_vec_len());
}
#[test]
fn array_element_write_preserves_props_after_element_growth() {
// 先写属性再 push 元素：元素区增长必须整体搬移属性区，不覆盖属性。
let bump = bumpalo::Bump::new();
let mut obj = JsObject::new_array(EMPTY_SHAPE_ID, JsValue::null(), 3, &bump);
obj.set_prop_shape(0, JsValue::int(99));
obj.set_prop_at(3, JsValue::int(4));
assert_eq!(obj.prop_count(), 4);
assert_eq!(obj.get_prop_at(3), JsValue::int(4));
assert_eq!(obj.get_prop_shape(0), JsValue::int(99));
}
#[test]
fn array_element_write_beyond_count_relocates_prop_zone() {
// 稀疏写入（越界索引）把属性区推到新元素之后，属性读取仍命中。
let bump = bumpalo::Bump::new();
let mut obj = JsObject::new_array(EMPTY_SHAPE_ID, JsValue::null(), 2, &bump);
obj.set_prop_shape(0, JsValue::int(7));
obj.set_prop_at(5, JsValue::int(50));
assert_eq!(obj.prop_count(), 6);
assert_eq!(obj.get_prop_at(5), JsValue::int(50));
assert_eq!(obj.get_prop_shape(0), JsValue::int(7));
}
#[test]
fn array_prop_count_truncate_keeps_prop_zone() {
// pop 截断元素区时属性区不得被删（meta 同步 insert/drain 对齐）。
let bump = bumpalo::Bump::new();
let mut obj = JsObject::new_array(EMPTY_SHAPE_ID, JsValue::null(), 3, &bump);
obj.set_prop_shape(0, JsValue::int(5));
obj.set_data_meta(3, PropAttributes::new(true, false, true));
obj.set_prop_count_fast(2);
assert_eq!(obj.prop_count(), 2);
assert_eq!(obj.get_prop_shape(0), JsValue::int(5));
assert!(obj.prop_meta_at(2).is_some());
}