Update test

crates/oxc_allocator/src/vec.rs

@@ -220,7 +220,7 @@ impl<'alloc, T: Hash> Hash for Vec<'alloc, T> {
 #[cfg(test)]
 mod test {
     use super::Vec;
-    use crate::Allocator;
+    use crate::{Allocator, Box};
 
     #[test]
     fn vec_with_capacity() {
@@ -256,13 +256,16 @@ mod test {
 
     #[test]
     fn test_vec_to_boxed_slice() {
-        // file: oxc_allocator/src/vec.rs
-        use crate::boxed::Box;
-
         let allocator = Allocator::default();
-        let v = Vec::from_iter_in([1, 2, 3], &allocator);
-        let b: Box<[i32]> = v.into_boxed_slice(); // <- compiler error
+        let mut v = Vec::with_capacity_in(10, &allocator);
+        v.extend([1, 2, 3]);
+
+        let b = v.into_boxed_slice();
+        // Check return value is an `oxc_allocator::Box`, not an `allocator_api2::boxed::Box`
+        let b: Box<[u8]> = b;
 
         assert_eq!(&*b, &[1, 2, 3]);
+        // Check length of slice is equal to what `v.len()` was, not `v.capacity()`
+        assert_eq!(b.len(), 3);
     }
 }