test(stdlib): #696 — behavioral parity tests for stdlib core utilities

Convert the stdlib-core FFI inventory entries listed in #696 into focused
behavioral parity fixtures and absorb the corresponding FFI symbols via
@Covers blocks so regen_ts_surface_inventory.py removes them from the
inventory.

New fixtures (test-files/test_parity_*.ts):
  lodash, dotenv, validator, uuid, nanoid, decimal, dayjs, moment,
  date_fns, lru_cache, commander, cron, async_local_storage

Existing fixtures extended with @Covers blocks:
  test_parity_events.ts, test_parity_zlib.ts

Non-deterministic surfaces (uuid v4/v7, nanoid, dayjs.now, fromNow) use
shape checks; everything else uses fixed inputs and anchored timestamps
so the printed output is byte-deterministic.

After regen, test_ffi_surface_stdlib_core.ts drops from 313 → 84 unique
FFI names (all areas listed in #696 are converted). ./test-coverage/
audit.sh --markdown still reports 1790/1790 (100.0%) TS coverage.

Author: TheHypnoo

test-coverage/COVERAGE.md

@@ -1,13 +1,13 @@
 # Perry FFI Test Coverage
 
-Generated: 2026-05-11T17:05:37Z
+Generated: 2026-05-13T15:52:20Z
 
 ## Summary
 
-- **Total FFI functions:** 1771
-- **Covered by TypeScript fixtures:** 1771 (100.0%)
-- **Covered by Rust tests:** 1430 (80.7%)
-- **Covered by either TS or Rust:** 1771 (100.0%)
+- **Total FFI functions:** 1790
+- **Covered by TypeScript fixtures:** 1790 (100.0%)
+- **Covered by Rust tests:** 1437 (80.3%)
+- **Covered by either TS or Rust:** 1790 (100.0%)
 - **Uncovered by either TS or Rust:** 0
 
 ## Coverage by File
@@ -16,7 +16,7 @@ Generated: 2026-05-11T17:05:37Z
 |------|-------|------------|--------------|----------|-------------|-------------------|
 | `crates/perry-runtime/src/arena.rs` | 4 | 4 | 4 | 4 | 100% | 100% |
 | `crates/perry-runtime/src/arkts_callbacks.rs` | 8 | 8 | 3 | 8 | 100% | 100% |
-| `crates/perry-runtime/src/array.rs` | 74 | 74 | 74 | 74 | 100% | 100% |
+| `crates/perry-runtime/src/array.rs` | 77 | 77 | 77 | 77 | 100% | 100% |
 | `crates/perry-runtime/src/bigint.rs` | 28 | 28 | 28 | 28 | 100% | 100% |
 | `crates/perry-runtime/src/box.rs` | 3 | 3 | 0 | 3 | 100% | 100% |
 | `crates/perry-runtime/src/buffer.rs` | 77 | 77 | 77 | 77 | 100% | 100% |
@@ -41,12 +41,12 @@ Generated: 2026-05-11T17:05:37Z
 | `crates/perry-runtime/src/media_playback.rs` | 15 | 15 | 0 | 15 | 100% | 100% |
 | `crates/perry-runtime/src/net.rs` | 11 | 11 | 11 | 11 | 100% | 100% |
 | `crates/perry-runtime/src/node_stream.rs` | 6 | 6 | 1 | 6 | 100% | 100% |
-| `crates/perry-runtime/src/object.rs` | 77 | 77 | 77 | 77 | 100% | 100% |
+| `crates/perry-runtime/src/object.rs` | 80 | 80 | 80 | 80 | 100% | 100% |
 | `crates/perry-runtime/src/os.rs` | 29 | 29 | 29 | 29 | 100% | 100% |
-| `crates/perry-runtime/src/path.rs` | 13 | 13 | 6 | 13 | 100% | 100% |
+| `crates/perry-runtime/src/path.rs` | 16 | 16 | 6 | 16 | 100% | 100% |
 | `crates/perry-runtime/src/plugin.rs` | 22 | 22 | 22 | 22 | 100% | 100% |
 | `crates/perry-runtime/src/process.rs` | 4 | 4 | 0 | 4 | 100% | 100% |
-| `crates/perry-runtime/src/promise.rs` | 34 | 34 | 22 | 34 | 100% | 100% |
+| `crates/perry-runtime/src/promise.rs` | 36 | 36 | 22 | 36 | 100% | 100% |
 | `crates/perry-runtime/src/proxy.rs` | 19 | 19 | 1 | 19 | 100% | 100% |
 | `crates/perry-runtime/src/regex.rs` | 19 | 19 | 19 | 19 | 100% | 100% |
 | `crates/perry-runtime/src/set.rs` | 11 | 11 | 11 | 11 | 100% | 100% |
@@ -56,7 +56,7 @@ Generated: 2026-05-11T17:05:37Z
 | `crates/perry-runtime/src/symbol.rs` | 16 | 16 | 8 | 16 | 100% | 100% |
 | `crates/perry-runtime/src/text.rs` | 4 | 4 | 0 | 4 | 100% | 100% |
 | `crates/perry-runtime/src/thread.rs` | 5 | 5 | 3 | 5 | 100% | 100% |
-| `crates/perry-runtime/src/timer.rs` | 17 | 17 | 9 | 17 | 100% | 100% |
+| `crates/perry-runtime/src/timer.rs` | 18 | 18 | 10 | 18 | 100% | 100% |
 | `crates/perry-runtime/src/tty.rs` | 8 | 8 | 8 | 8 | 100% | 100% |
 | `crates/perry-runtime/src/tui/ffi.rs` | 32 | 32 | 30 | 32 | 100% | 100% |
 | `crates/perry-runtime/src/tui/hooks.rs` | 26 | 26 | 26 | 26 | 100% | 100% |
@@ -69,6 +69,7 @@ Generated: 2026-05-11T17:05:37Z
 | `crates/perry-runtime/src/value.rs` | 54 | 54 | 54 | 54 | 100% | 100% |
 | `crates/perry-runtime/src/watchos_game_loop.rs` | 2 | 2 | 1 | 2 | 100% | 100% |
 | `crates/perry-runtime/src/weakref.rs` | 15 | 15 | 1 | 15 | 100% | 100% |
+| `crates/perry-runtime/src/webassembly.rs` | 7 | 7 | 0 | 7 | 100% | 100% |
 | `crates/perry-stdlib/src/argon2.rs` | 5 | 5 | 2 | 5 | 100% | 100% |
 | `crates/perry-stdlib/src/async_local_storage.rs` | 6 | 6 | 5 | 6 | 100% | 100% |
 | `crates/perry-stdlib/src/axios.rs` | 8 | 8 | 8 | 8 | 100% | 100% |

test-files/test_ffi_surface_runtime_core.ts

@@ -6,7 +6,7 @@
 // inventory into behavioral tests as each area gets deeper compatibility
 // coverage.
 //
-// Inventory entries: 915 unique FFI names, 934 declarations.
+// Inventory entries: 930 unique FFI names, 949 declarations.
 
 const testFfiSurfaceRuntimeCoreVersion = 1;
 if (testFfiSurfaceRuntimeCoreVersion !== 1) {
@@ -40,6 +40,7 @@ crates/perry-runtime/src/array.rs:
   - js_array_find_last_index
   - js_array_flat
   - js_array_flatMap
+  - js_array_flat_depth
   - js_array_forEach
   - js_array_from_f64
   - js_array_from_jsvalue
@@ -78,6 +79,8 @@ crates/perry-runtime/src/array.rs:
   - js_array_values
   - js_array_with
   - js_iterator_to_array
+  - js_tagged_template_register_raw
+  - js_template_raw
 crates/perry-runtime/src/bigint.rs:
   - js_bigint_add
   - js_bigint_and
@@ -189,7 +192,6 @@ crates/perry-runtime/src/buffer.rs:
   - js_uint8array_new
   - js_value_to_string_with_encoding
 crates/perry-runtime/src/builtins.rs:
-  - js_add
   - js_array_print
   - js_console_assert
   - js_console_assert_spread
@@ -239,7 +241,6 @@ crates/perry-runtime/src/builtins.rs:
   - js_queue_microtask
   - js_string_coerce
   - js_structured_clone
-  - js_sub
   - js_text_decoder_decode
   - perry_debug_trace_init
   - perry_debug_trace_init_done
@@ -573,6 +574,7 @@ crates/perry-runtime/src/object.rs:
   - js_register_handle_method_dispatch
   - js_register_handle_property_dispatch
   - js_register_handle_property_set_dispatch
+  - js_unresolved_default_call
   - js_unresolved_namespace_stub
   - js_value_to_object
   - perry_key_content_hash
@@ -613,11 +615,14 @@ crates/perry-runtime/src/path.rs:
   - js_path_format
   - js_path_is_absolute
   - js_path_join
+  - js_path_matches_glob
   - js_path_normalize
   - js_path_parse
   - js_path_relative
   - js_path_resolve
+  - js_path_resolve_join
   - js_path_sep_get
+  - js_path_to_namespaced_path
 crates/perry-runtime/src/plugin.rs:
   - perry_plugin_count
   - perry_plugin_discover
@@ -647,9 +652,11 @@ crates/perry-runtime/src/process.rs:
 crates/perry-runtime/src/promise.rs:
   - js_array_from_async
   - js_assimilate_thenable
+  - js_async_first_call
   - js_async_step_chain
   - js_async_step_done
   - js_await_any_promise
+  - js_get_current_step_closure
   - js_is_promise
   - js_iter_result_get_done
   - js_iter_result_get_value
@@ -839,6 +846,7 @@ crates/perry-runtime/src/timer.rs:
   - js_interval_timer_tick
   - js_set_timeout
   - js_set_timeout_callback
+  - js_set_timeout_callback_args
   - js_set_timeout_value
   - js_sleep_ms
   - js_timer_has_pending
@@ -974,4 +982,12 @@ crates/perry-runtime/src/weakref.rs:
   - js_weakset_delete
   - js_weakset_has
   - js_weakset_new
+crates/perry-runtime/src/webassembly.rs:
+  - js_webassembly_call_export_0
+  - js_webassembly_call_export_1
+  - js_webassembly_call_export_2
+  - js_webassembly_call_export_3
+  - js_webassembly_call_export_4
+  - js_webassembly_instantiate
+  - js_webassembly_validate
 */