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: 2026-05-13T16:03:36Z
+Generated: 2026-05-14T05:05:17Z
 
 ## Summary
 
-- **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%)
+- **Total FFI functions:** 1791
+- **Covered by TypeScript fixtures:** 1791 (100.0%)
+- **Covered by Rust tests:** 1438 (80.3%)
+- **Covered by either TS or Rust:** 1791 (100.0%)
 - **Uncovered by either TS or Rust:** 0
 
 ## Coverage by File
@@ -41,7 +41,7 @@ Generated: 2026-05-13T16:03:36Z
 | `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` | 80 | 80 | 80 | 80 | 100% | 100% |
+| `crates/perry-runtime/src/object.rs` | 81 | 81 | 81 | 81 | 100% | 100% |
 | `crates/perry-runtime/src/os.rs` | 29 | 29 | 29 | 29 | 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% |

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: 360 unique FFI names, 379 declarations.
+// Inventory entries: 359 unique FFI names, 378 declarations.
 
 const testFfiSurfaceRuntimeCoreVersion = 1;
 if (testFfiSurfaceRuntimeCoreVersion !== 1) {
@@ -39,7 +39,6 @@ crates/perry-runtime/src/buffer.rs:
   - js_buffer_fill_random
   - js_buffer_print
 crates/perry-runtime/src/builtins.rs:
-  - js_add
   - js_array_print
   - js_console_assert
   - js_console_assert_spread
@@ -88,7 +87,6 @@ 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
@@ -228,6 +226,7 @@ crates/perry-runtime/src/node_stream.rs:
   - js_node_stream_transform_new
   - js_node_stream_writable_new
 crates/perry-runtime/src/object.rs:
+  - js_create_namespace
   - js_unresolved_default_call
 crates/perry-runtime/src/os.rs:
   - js_os_arch

test-files/test_ffi_surface_stdlib_core.ts

@@ -6,7 +6,7 @@
 // inventory into behavioral tests as each area gets deeper compatibility
 // coverage.
 //
-// Inventory entries: 313 unique FFI names, 316 declarations.
+// Inventory entries: 84 unique FFI names, 85 declarations.
 
 const testFfiSurfaceStdlibCoreVersion = 1;
 if (testFfiSurfaceStdlibCoreVersion !== 1) {
@@ -16,13 +16,6 @@ console.log("test_ffi_surface_stdlib_core: ok");
 
 /*
 @covers
-crates/perry-stdlib/src/async_local_storage.rs:
-  - js_async_local_storage_disable
-  - js_async_local_storage_enter_with
-  - js_async_local_storage_exit
-  - js_async_local_storage_get_store
-  - js_async_local_storage_new
-  - js_async_local_storage_run
 crates/perry-stdlib/src/axios.rs:
   - js_axios_delete
   - js_axios_get
@@ -32,135 +25,12 @@ crates/perry-stdlib/src/axios.rs:
   - js_axios_response_data
   - js_axios_response_status
   - js_axios_response_status_text
-crates/perry-stdlib/src/commander.rs:
-  - js_commander_action
-  - js_commander_args_count
-  - js_commander_command
-  - js_commander_description
-  - js_commander_get_arg
-  - js_commander_get_option
-  - js_commander_get_option_bool
-  - js_commander_get_option_number
-  - js_commander_name
-  - js_commander_new
-  - js_commander_option
-  - js_commander_opts
-  - js_commander_parse
-  - js_commander_required_option
-  - js_commander_version
 crates/perry-stdlib/src/common/dispatch.rs:
   - js_handle_method_dispatch
   - js_handle_property_set_dispatch
   - js_stdlib_init_dispatch
 crates/perry-stdlib/src/common/handle.rs:
   - js_handle_count
-crates/perry-stdlib/src/cron.rs:
-  - js_cron_clear_interval
-  - js_cron_clear_timeout
-  - js_cron_describe
-  - js_cron_job_is_running
-  - js_cron_job_start
-  - js_cron_job_stop
-  - js_cron_next_date
-  - js_cron_next_dates
-  - js_cron_schedule
-  - js_cron_set_interval
-  - js_cron_set_timeout
-  - js_cron_timer_has_pending
-  - js_cron_timer_tick
-  - js_cron_validate
-crates/perry-stdlib/src/dayjs.rs:
-  - js_datefns_add_days
-  - js_datefns_add_months
-  - js_datefns_add_years
-  - js_datefns_difference_in_days
-  - js_datefns_difference_in_hours
-  - js_datefns_difference_in_minutes
-  - js_datefns_end_of_day
-  - js_datefns_format
-  - js_datefns_is_after
-  - js_datefns_is_before
-  - js_datefns_parse_iso
-  - js_datefns_start_of_day
-  - js_dayjs_add
-  - js_dayjs_date
-  - js_dayjs_day
-  - js_dayjs_diff
-  - js_dayjs_end_of
-  - js_dayjs_format
-  - js_dayjs_from_timestamp
-  - js_dayjs_hour
-  - js_dayjs_is_after
-  - js_dayjs_is_before
-  - js_dayjs_is_same
-  - js_dayjs_is_valid
-  - js_dayjs_millisecond
-  - js_dayjs_minute
-  - js_dayjs_month
-  - js_dayjs_now
-  - js_dayjs_parse
-  - js_dayjs_second
-  - js_dayjs_start_of
-  - js_dayjs_subtract
-  - js_dayjs_to_iso_string
-  - js_dayjs_unix
-  - js_dayjs_value_of
-  - js_dayjs_year
-crates/perry-stdlib/src/decimal.rs:
-  - js_decimal_abs
-  - js_decimal_ceil
-  - js_decimal_cmp
-  - js_decimal_cmp_value
-  - js_decimal_coerce_to_handle
-  - js_decimal_div
-  - js_decimal_div_number
-  - js_decimal_div_value
-  - js_decimal_eq
-  - js_decimal_eq_value
-  - js_decimal_floor
-  - js_decimal_from_number
-  - js_decimal_from_string
-  - js_decimal_gt
-  - js_decimal_gt_value
-  - js_decimal_gte
-  - js_decimal_gte_value
-  - js_decimal_is_negative
-  - js_decimal_is_positive
-  - js_decimal_is_zero
-  - js_decimal_lt
-  - js_decimal_lt_value
-  - js_decimal_lte
-  - js_decimal_lte_value
-  - js_decimal_minus
-  - js_decimal_minus_number
-  - js_decimal_minus_value
-  - js_decimal_mod
-  - js_decimal_mod_value
-  - js_decimal_neg
-  - js_decimal_plus
-  - js_decimal_plus_number
-  - js_decimal_plus_value
-  - js_decimal_pow
-  - js_decimal_round
-  - js_decimal_sqrt
-  - js_decimal_times
-  - js_decimal_times_number
-  - js_decimal_times_value
-  - js_decimal_to_fixed
-  - js_decimal_to_number
-  - js_decimal_to_string
-crates/perry-stdlib/src/dotenv.rs:
-  - js_dotenv_config
-  - js_dotenv_config_path
-  - js_dotenv_parse
-crates/perry-stdlib/src/events.rs:
-  - js_event_emitter_emit
-  - js_event_emitter_emit0
-  - js_event_emitter_listener_count
-  - js_event_emitter_new
-  - js_event_emitter_on
-  - js_event_emitter_remove_all_listeners
-  - js_event_emitter_remove_listener
 crates/perry-stdlib/src/exponential_backoff.rs:
   - backOff
   - js_backoff_simple
@@ -203,90 +73,6 @@ crates/perry-stdlib/src/fastify/context.rs:
 crates/perry-stdlib/src/fastify/server.rs:
   - js_fastify_close
   - js_fastify_listen
-crates/perry-stdlib/src/lib.rs:
-  - js_cron_timer_has_pending
-  - js_cron_timer_tick
-crates/perry-stdlib/src/lodash.rs:
-  - js_lodash_camel_case
-  - js_lodash_capitalize
-  - js_lodash_chunk
-  - js_lodash_clamp
-  - js_lodash_compact
-  - js_lodash_concat
-  - js_lodash_difference
-  - js_lodash_drop
-  - js_lodash_drop_right
-  - js_lodash_fill
-  - js_lodash_first
-  - js_lodash_flatten
-  - js_lodash_in_range
-  - js_lodash_initial
-  - js_lodash_is_empty
-  - js_lodash_is_nil
-  - js_lodash_kebab_case
-  - js_lodash_last
-  - js_lodash_lower_case
-  - js_lodash_pad
-  - js_lodash_pad_end
-  - js_lodash_pad_start
-  - js_lodash_random
-  - js_lodash_range
-  - js_lodash_repeat
-  - js_lodash_reverse
-  - js_lodash_size
-  - js_lodash_snake_case
-  - js_lodash_tail
-  - js_lodash_take
-  - js_lodash_take_right
-  - js_lodash_times
-  - js_lodash_trim
-  - js_lodash_trim_end
-  - js_lodash_trim_start
-  - js_lodash_truncate
-  - js_lodash_uniq
-  - js_lodash_upper_case
-crates/perry-stdlib/src/lru_cache.rs:
-  - js_lru_cache_clear
-  - js_lru_cache_delete
-  - js_lru_cache_get
-  - js_lru_cache_has
-  - js_lru_cache_new
-  - js_lru_cache_peek
-  - js_lru_cache_set
-  - js_lru_cache_size
-crates/perry-stdlib/src/moment.rs:
-  - js_moment_add
-  - js_moment_clone
-  - js_moment_date
-  - js_moment_day
-  - js_moment_diff
-  - js_moment_end_of
-  - js_moment_format
-  - js_moment_from_now
-  - js_moment_from_timestamp
-  - js_moment_hour
-  - js_moment_is_after
-  - js_moment_is_before
-  - js_moment_is_between
-  - js_moment_is_same
-  - js_moment_is_valid
-  - js_moment_millisecond
-  - js_moment_minute
-  - js_moment_month
-  - js_moment_now
-  - js_moment_parse
-  - js_moment_second
-  - js_moment_start_of
-  - js_moment_subtract
-  - js_moment_to_date
-  - js_moment_to_iso_string
-  - js_moment_unix
-  - js_moment_value_of
-  - js_moment_year
-crates/perry-stdlib/src/nanoid.rs:
-  - js_nanoid
-  - js_nanoid_custom
-  - js_nanoid_sized
 crates/perry-stdlib/src/perry_ffi_async.rs:
   - perry_ffi_promise_new
   - perry_ffi_promise_reject_bits
@@ -325,36 +111,4 @@ crates/perry-stdlib/src/sqlite.rs:
   - js_sqlite_stmt_raw
   - js_sqlite_stmt_run
   - js_sqlite_transaction
-crates/perry-stdlib/src/uuid.rs:
-  - js_uuid_nil
-  - js_uuid_v1
-  - js_uuid_v4
-  - js_uuid_v7
-  - js_uuid_validate
-  - js_uuid_version
-crates/perry-stdlib/src/validator.rs:
-  - js_validator_contains
-  - js_validator_equals
-  - js_validator_is_alpha
-  - js_validator_is_alphanumeric
-  - js_validator_is_email
-  - js_validator_is_empty
-  - js_validator_is_float
-  - js_validator_is_hexadecimal
-  - js_validator_is_int
-  - js_validator_is_json
-  - js_validator_is_length
-  - js_validator_is_length_min
-  - js_validator_is_lowercase
-  - js_validator_is_numeric
-  - js_validator_is_uppercase
-  - js_validator_is_url
-  - js_validator_is_uuid
-crates/perry-stdlib/src/zlib.rs:
-  - js_zlib_deflate_sync
-  - js_zlib_gunzip
-  - js_zlib_gunzip_sync
-  - js_zlib_gzip
-  - js_zlib_gzip_sync
-  - js_zlib_inflate_sync
 */