diff --git a/executors/dart/bin/executor.dart b/executors/dart/bin/executor.dart
index 478de2f6..bef1677a 100644
--- a/executors/dart/bin/executor.dart
+++ b/executors/dart/bin/executor.dart
@@ -82,7 +82,7 @@ void printVersion() {
   final dartVersion = version.substring(0, version.indexOf(' '));
   final versionInfo = {
     'platform': 'Dart Native',
-    'icuVersion': '73', //TODO: get from ICU4X somehow
+    'icuVersion': '77', //TODO: get from ICU4X somehow
     'platformVersion': dartVersion,
     'intlVersion': intl4xVersion,
   };
diff --git a/executors/dart/lib/collator.dart b/executors/dart/lib/collator.dart
index 0d9a9f7c..84e87a57 100644
--- a/executors/dart/lib/collator.dart
+++ b/executors/dart/lib/collator.dart
@@ -6,16 +6,22 @@ import 'package:intl4x/collation.dart';
 import 'package:intl4x/intl4x.dart';
 
 String testCollation(String jsonEncoded) {
-  final json =
-      jsonDecode(jsonEncoded)
-          as Map<
-            String,
-            dynamic
-          >; // For the moment, use strings for easier interop
+  final json = jsonDecode(jsonEncoded) as Map<String, dynamic>;
   // Global default locale
-  final testLocale = json['locale'] as String? ?? 'en';
   final outputLine = <String, dynamic>{'label': json['label']};
-
+  if (json.containsKey('rules')) {
+    outputLine['error_type'] = 'unsupported';
+    outputLine['unsupported'] = 'unsupported_options';
+    outputLine['error_message'] = 'Rules are not supported';
+    return jsonEncode(outputLine);
+  }
+  final localeString = json['locale'] as String? ?? 'en';
+  if (localeString == 'root') {
+    outputLine['error_type'] = 'unsupported';
+    outputLine['unsupported'] = 'unsupported_options';
+    outputLine['error_message'] = 'Locale `root` is unsupported';
+    return jsonEncode(outputLine);
+  }
   // Set up collator object with optional locale and testOptions.
   final s1 = json['s1'];
   final s2 = json['s2'];
@@ -36,6 +42,7 @@ String testCollation(String jsonEncoded) {
           .where((value) => value.jsName == json['case_first'])
           .firstOrNull ??
       CaseFirst.localeDependent;
+  final compareType = json['compare_type'] as String?;
 
   if (s1 == null || s2 == null) {
     outputLine.addAll({
@@ -45,7 +52,7 @@ String testCollation(String jsonEncoded) {
     });
   } else {
     try {
-      final coll = Intl(locale: Locale.parse(testLocale));
+      final coll = Intl(locale: Locale.parse(localeString));
 
       final collationOptions = CollationOptions(
         ignorePunctuation: ignorePunctuation,
@@ -55,7 +62,17 @@ String testCollation(String jsonEncoded) {
       );
 
       final compared = coll.collation(collationOptions).compare(s1, s2);
-      final result = compared <= 0;
+
+      bool result;
+      if (compareType == '=') {
+        // Check for strict equality comparison
+        result = compared == 0;
+      } else if (compareType != null && compareType.startsWith('<')) {
+        // Check results with different compare types
+        result = compared < 0;
+      } else {
+        result = compared <= 0;
+      }
       outputLine['result'] = result;
 
       if (result != true) {
diff --git a/executors/dart/lib/datetime_format.dart b/executors/dart/lib/datetime_format.dart
index a32861ea..21c270f8 100644
--- a/executors/dart/lib/datetime_format.dart
+++ b/executors/dart/lib/datetime_format.dart
@@ -1,4 +1,5 @@
 import 'dart:convert';
+
 import 'package:collection/collection.dart';
 import 'package:intl4x/datetime_format.dart';
 import 'package:intl4x/intl4x.dart';
@@ -10,22 +11,21 @@ import 'package:intl4x/intl4x.dart';
 String testDateTimeFmt(String jsonEncoded) {
   final json = jsonDecode(jsonEncoded) as Map<String, dynamic>;
 
-  final label = json['label'];
   var localeString = json['locale'] as String?; // locale can be null from JSON
   if (localeString == null || localeString.isEmpty) {
     localeString = 'und'; // Default to 'und' if locale is null or empty
   }
 
+  final returnJson = <String, dynamic>{'label': json['label']};
+
   // Parse Locale string
   Locale locale;
   try {
     locale = Locale.parse(localeString.replaceAll('_', '-'));
   } catch (e) {
-    return jsonEncode({
-      'label': label,
-      'error': 'Invalid locale format: ${e.toString()}',
-      'locale': localeString,
-    });
+    returnJson['error'] = 'Invalid locale format: ${e.toString()}';
+    returnJson['locale'] = localeString;
+    return jsonEncode(returnJson);
   }
 
   var testOptionsJson = <String, dynamic>{};
@@ -33,6 +33,12 @@ String testDateTimeFmt(String jsonEncoded) {
     testOptionsJson = json['options'] as Map<String, dynamic>;
   }
 
+  if (testOptionsJson['dateTimeFormatType'] == 'atTime') {
+    returnJson['error_type'] = 'unsupported';
+    returnJson['unsupported'] = '`at` not supported';
+    return jsonEncode(returnJson);
+  }
+
   // Initialize DateTimeFormatOptions
   var dateTimeFormatOptions = DateTimeFormatOptions();
 
@@ -53,11 +59,22 @@ String testDateTimeFmt(String jsonEncoded) {
   }
 
   // ignore: unused_local_variable - to be used with the timezoneformatter
-  String? timezone;
-  if (testOptionsJson.containsKey('time_zone')) {
-    timezone = testOptionsJson['time_zone'] as String;
+  String? timeZoneName;
+  int? offsetSeconds;
+  if (testOptionsJson.containsKey('timeZone') &&
+      json.containsKey('tz_offset_secs')) {
+    timeZoneName = testOptionsJson['timeZone'] as String;
+    offsetSeconds = (json['tz_offset_secs'] as num).toInt();
   }
 
+  final semanticSkeleton = testOptionsJson['semanticSkeleton'] as String?;
+  final semanticSkeletonLength =
+      testOptionsJson['semanticSkeletonLength'] as String?;
+
+  final dateStyle = testOptionsJson['dateStyle'] as String?;
+  final timeStyle = testOptionsJson['timeStyle'] as String?;
+  final yearStyle = testOptionsJson['yearStyle'] as String?;
+
   DateTime? testDate;
   if (json['input_string'] != null) {
     final isoDateString = json['input_string'] as String;
@@ -72,34 +89,133 @@ String testDateTimeFmt(String jsonEncoded) {
     try {
       testDate = DateTime.parse(testDateString);
     } catch (e) {
-      return jsonEncode({
-        'label': label,
-        'error': 'Invalid input_string date format: ${e.toString()}',
-        'input_string': isoDateString,
-      });
+      returnJson['error'] = 'Invalid input_string date format: ${e.toString()}';
+      returnJson['input_string'] = isoDateString;
+      return jsonEncode(returnJson);
     }
   } else {
     testDate = DateTime.now();
   }
 
-  final returnJson = <String, dynamic>{'label': label};
   final dtFormatter = Intl(
     locale: locale,
   ).dateTimeFormat(dateTimeFormatOptions);
 
-  try {} catch (error) {
-    returnJson['error'] = 'DateTimeFormat Constructor: ${error.toString()}';
-    returnJson['options'] = testOptionsJson;
-    return jsonEncode(returnJson);
-  }
-
   try {
-    final formattedDt = dtFormatter.ymd(testDate);
+    final formatter = semanticSkeleton != null
+        ? getFormatterForSkeleton(
+            semanticSkeleton,
+            semanticSkeletonLength,
+            dtFormatter,
+          )
+        : getFormatterForStyle(dateStyle, timeStyle, yearStyle, dtFormatter);
+    String formattedDt;
+    if (timeStyle == 'full' && timeZoneName != null) {
+      final offset = Duration(seconds: offsetSeconds!);
+      final timeZone = TimeZone(name: timeZoneName, offset: offset);
+      final timeZoneStyle = 'long';
+      final zonedFormatter = getZonedFormatter(timeZoneStyle, formatter);
+      formattedDt = zonedFormatter.format(testDate.add(offset), timeZone);
+    } else {
+      formattedDt = formatter.format(testDate);
+    }
     returnJson['result'] = formattedDt;
-    returnJson['actual_options'] = dateTimeFormatOptions.toString();
-  } catch (error) {
-    returnJson['unsupported'] = ': ${error.toString()}';
+  } on Exception catch (e) {
+    returnJson['error_type'] = 'unsupported';
+    returnJson['unsupported'] = ': ${e.toString()}';
+    return jsonEncode(returnJson);
   }
+  returnJson['actual_options'] = dateTimeFormatOptions.humanReadable;
+  returnJson['options'] = testOptionsJson;
 
   return jsonEncode(returnJson);
 }
+
+DateTimeFormatter getFormatterForSkeleton(
+  String semanticSkeleton,
+  String? semanticSkeletonLength,
+  DateTimeFormatBuilder dtFormatter,
+) {
+  // The provided Rust code implies a more complex logic, but here we'll map the known skeletons.
+  // The Rust code's `None => None` and `None => Ok(...)` branches aren't directly translatable
+  // to a Dart function that must return a Formatter. We'll handle the valid cases and throw for others.
+
+  final semanticDateStyle = switch (semanticSkeletonLength) {
+    'short' => DateFormatStyle.short,
+    'medium' => DateFormatStyle.medium,
+    'long' => DateFormatStyle.long,
+    _ => throw Exception(),
+  };
+  return switch (semanticSkeleton) {
+    'D' || 'DT' || 'DTZ' => dtFormatter.d(),
+    'MD' => dtFormatter.md(),
+    'MDT' || 'MDTZ' => dtFormatter.mdt(dateStyle: semanticDateStyle),
+    'YMD' || 'YMDT' || 'YMDTZ' => dtFormatter.ymd(dateStyle: semanticDateStyle),
+    'YMDE' => dtFormatter.ymde(dateStyle: semanticDateStyle),
+    'YMDET' || 'YMDETZ' => dtFormatter.ymdet(dateStyle: semanticDateStyle),
+    'M' => dtFormatter.m(),
+    'Y' => dtFormatter.y(),
+    'T' || 'Z' || 'TZ' => dtFormatter.t(),
+    _ => throw Exception('Unknown skeleton: $semanticSkeleton'),
+  };
+}
+
+ZonedDateTimeFormatter getZonedFormatter(
+  String timeZoneStyle,
+  DateTimeFormatter formatter,
+) => switch (timeZoneStyle) {
+  'short' => formatter.withTimeZoneShort(),
+  'long' => formatter.withTimeZoneLong(),
+  'full' => formatter.withTimeZoneLongGeneric(),
+  String() => throw Exception('Unknown time zone style `$timeZoneStyle`'),
+};
+
+DateTimeFormatter getFormatterForStyle(
+  String? dateStyle,
+  String? timeStyle,
+  String? yearStyle,
+  DateTimeFormatBuilder dtFormatter,
+) => switch ((dateStyle, timeStyle, yearStyle)) {
+  ('medium', null, _) => dtFormatter.ymd(dateStyle: DateFormatStyle.medium),
+  (null, 'short', _) => dtFormatter.t(style: TimeFormatStyle.short),
+  ('full', 'short', null) => dtFormatter.ymdet(
+    dateStyle: DateFormatStyle.full,
+    timeStyle: TimeFormatStyle.short,
+  ),
+  ('full', 'full', null) => dtFormatter.ymdet(
+    dateStyle: DateFormatStyle.full,
+    timeStyle: TimeFormatStyle.full,
+  ),
+  ('short', 'full', null) => dtFormatter.ymdt(
+    dateStyle: DateFormatStyle.short,
+    timeStyle: TimeFormatStyle.full,
+  ),
+  ('short', 'full', 'with_era') => dtFormatter.ymdet(
+    dateStyle: DateFormatStyle.short,
+    timeStyle: TimeFormatStyle.full,
+  ),
+  (_, _, 'with_era') => dtFormatter.ymde(),
+  (_, _, _) => throw Exception(
+    'Unknown combination of date style `$dateStyle`, time style `$timeStyle`, and year style `$yearStyle`',
+  ),
+};
+
+extension on DateTimeFormatOptions {
+  String get humanReadable {
+    final fields = <String, dynamic>{
+      if (calendar != null) 'calendar': calendar,
+      if (dayPeriod != null) 'dayPeriod': dayPeriod,
+      if (numberingSystem != null) 'numberingSystem': numberingSystem,
+      if (clockstyle != null) 'clockstyle': clockstyle,
+      if (era != null) 'era': era,
+      if (timestyle != null) 'timestyle': timestyle,
+      if (fractionalSecondDigits != null)
+        'fractionalSecondDigits': fractionalSecondDigits,
+      'formatMatcher': formatMatcher,
+    };
+    final entries = fields.entries
+        .map((e) => '${e.key}: ${e.value}')
+        .join(', ');
+    return 'DateTimeFormatOptions($entries)';
+  }
+}
diff --git a/executors/dart/lib/lang_names.dart b/executors/dart/lib/lang_names.dart
index 107fbfe6..f04c2e3b 100644
--- a/executors/dart/lib/lang_names.dart
+++ b/executors/dart/lib/lang_names.dart
@@ -26,6 +26,14 @@ String testLangNames(String jsonEncoded) {
   }
 
   final languageLabel = json['language_label'] as String;
+  if (languageLabel.contains('u-kr')) {
+    outputLine.addAll({
+      'unsupported': 'u-kr extension not supported',
+      'error_retry': false, // Do not repeat
+    });
+    return jsonEncode(outputLine);
+  }
+
   Locale languageLabelLocale;
   try {
     languageLabelLocale = Locale.parse(languageLabel);
@@ -49,7 +57,6 @@ String testLangNames(String jsonEncoded) {
     outputLine['result'] = resultLangName;
   } catch (error) {
     outputLine.addAll({
-      'error_type': 'unsupported',
       'error_detail': error.toString(),
       'actual_options': options.toJson(),
       'error_retry': false, // Do not repeat
diff --git a/executors/dart/lib/numberformat.dart b/executors/dart/lib/numberformat.dart
index 7419b5cc..e2a8caf3 100644
--- a/executors/dart/lib/numberformat.dart
+++ b/executors/dart/lib/numberformat.dart
@@ -280,7 +280,8 @@ NumberFormatOptions _decimalPatternToOptions(
     );
     return numberFormatOptions.copyWith(roundingMode: roundingMode);
   } else {
-    return numberFormatOptions;
+    //TODO: remove this halfEven default override, as soon as it is always passed in the numberformat args.
+    return numberFormatOptions.copyWith(roundingMode: RoundingMode.halfEven);
   }
 }
 
@@ -324,9 +325,6 @@ NumberFormatOptions _fromJson(Map<String, dynamic> options) {
   final signDisplay = SignDisplay.values
       .where((element) => element.name == options['signDisplay'])
       .firstOrNull;
-  final localeMatcher = LocaleMatcher.values
-      .where((element) => element.jsName == options['localeMatcher'])
-      .firstOrNull;
   final useGrouping = Grouping.values
       .where((element) => element.jsName == options['useGrouping'])
       .firstOrNull;
@@ -374,7 +372,6 @@ NumberFormatOptions _fromJson(Map<String, dynamic> options) {
   return NumberFormatOptions.custom().copyWith(
     style: style,
     currency: currency,
-    localeMatcher: localeMatcher,
     signDisplay: signDisplay,
     notation: notation,
     useGrouping: useGrouping,
@@ -391,11 +388,10 @@ extension on NumberFormatOptions {
     return {
       'style': style.name,
       'currency': currency,
-      'localeMatcher': localeMatcher.jsName,
       'signDisplay': signDisplay.name,
       'notation': notation.name,
       'useGrouping': useGrouping.jsName,
-      'numberingSystem': numberingSystem?.toString(),
+      'numberingSystem': numberingSystem,
       'roundingMode': roundingMode.name,
       'trailingZeroDisplay': trailingZeroDisplay.name,
       'minimumIntegerDigits': minimumIntegerDigits,
diff --git a/executors/dart/lib/version.dart b/executors/dart/lib/version.dart
index cdd58ea8..d54983bd 100644
--- a/executors/dart/lib/version.dart
+++ b/executors/dart/lib/version.dart
@@ -1,2 +1,2 @@
 /// This file is autogenerated by bin/set_version.dart, do not modify manually.
-const intl4xVersion = '0.12.2';
+const intl4xVersion = '0.13.0';
diff --git a/executors/dart/out/version.js b/executors/dart/out/version.js
index 1cfd1d1a..92fc0e76 100644
--- a/executors/dart/out/version.js
+++ b/executors/dart/out/version.js
@@ -1,2 +1,2 @@
-const dartVersion = "0.12.2";
+const dartVersion = "0.13.0";
 module.exports = { dartVersion };
diff --git a/executors/dart/pubspec.lock b/executors/dart/pubspec.lock
index 1c22bf3d..c2800c5c 100644
--- a/executors/dart/pubspec.lock
+++ b/executors/dart/pubspec.lock
@@ -5,18 +5,18 @@ packages:
     dependency: transitive
     description:
       name: _fe_analyzer_shared
-      sha256: f7bac1065b51df46b2291296e1c1b3616a47aeb735aea46a8ca3dcb7bb700ee7
+      sha256: f0bb5d1648339c8308cc0b9838d8456b3cfe5c91f9dc1a735b4d003269e5da9a
       url: "https://pub.dev"
     source: hosted
-    version: "86.0.0"
+    version: "88.0.0"
   analyzer:
     dependency: transitive
     description:
       name: analyzer
-      sha256: "4001e2de7c9d125af9504b4c4f64ebba507c9cb9c712caf02ac1d4c37824f58c"
+      sha256: "0b7b9c329d2879f8f05d6c05b32ee9ec025f39b077864bdb5ac9a7b63418a98f"
       url: "https://pub.dev"
     source: hosted
-    version: "8.0.0"
+    version: "8.1.1"
   args:
     dependency: transitive
     description:
@@ -61,10 +61,10 @@ packages:
     dependency: transitive
     description:
       name: code_assets
-      sha256: dd7ed641b7f642092092969f2dcd5845ab31c9f3efead0c06ca437bf9ce8a8b2
+      sha256: "7f42899e7b22f7810ea8c2b281c979add25555fbe391dde539621069e20b90b4"
       url: "https://pub.dev"
     source: hosted
-    version: "0.19.4"
+    version: "0.19.5"
   collection:
     dependency: "direct main"
     description:
@@ -133,10 +133,10 @@ packages:
     dependency: transitive
     description:
       name: hooks
-      sha256: "75363eae6c0c2db051c4f6b3b1fcdea8a09c4a596cc83bfff847661da6e80dfc"
+      sha256: "2bd640e4625fdfe5788ef33d825a8639797d44bce05695ab13543cde0ff9a078"
       url: "https://pub.dev"
     source: hosted
-    version: "0.19.5"
+    version: "0.20.0"
   http_multi_server:
     dependency: transitive
     description:
@@ -153,14 +153,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.1.2"
+  icu4x:
+    dependency: transitive
+    description:
+      name: icu4x
+      sha256: "9e89a363c410608de336e1a15c599ecc49245cc6f9d7d719b4b1ced57151c92c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.0-dev.0"
   intl4x:
     dependency: "direct main"
     description:
       name: intl4x
-      sha256: "2684e98ae48b288e345bfc32356d9497d120fafc5a5bf8d840d1a6fd19f3a526"
+      sha256: "17ca4511e95d036954897ca192d771598b3744c07bd43de72a35af795f244228"
       url: "https://pub.dev"
     source: hosted
-    version: "0.12.2"
+    version: "0.13.0"
   io:
     dependency: transitive
     description:
@@ -229,10 +237,10 @@ packages:
     dependency: transitive
     description:
       name: native_toolchain_c
-      sha256: "74a0c80d877c519bc6bde2c4e27b6b01c1f93c9b480f65ceae8bedd3aba3c086"
+      sha256: "7e8358a4f6ec69a4f2d366bb971af298aca50d6c2e8a07be7c12d7f6d40460aa"
       url: "https://pub.dev"
     source: hosted
-    version: "0.16.8"
+    version: "0.17.1"
   node_preamble:
     dependency: "direct main"
     description:
@@ -421,10 +429,10 @@ packages:
     dependency: transitive
     description:
       name: watcher
-      sha256: "0b7fd4a0bbc4b92641dbf20adfd7e3fd1398fe17102d94b674234563e110088a"
+      sha256: "5bf046f41320ac97a469d506261797f35254fa61c641741ef32dacda98b7d39c"
       url: "https://pub.dev"
     source: hosted
-    version: "1.1.2"
+    version: "1.1.3"
   web:
     dependency: transitive
     description:
diff --git a/executors/dart/pubspec.yaml b/executors/dart/pubspec.yaml
index 25a564ff..6f18a0b3 100644
--- a/executors/dart/pubspec.yaml
+++ b/executors/dart/pubspec.yaml
@@ -6,7 +6,7 @@ environment:
 
 dependencies:
   collection: ^1.19.1
-  intl4x: 0.12.2
+  intl4x: 0.13.0
   node_preamble: ^2.0.2
   pubspec_lock_parse: ^2.2.0
 
diff --git a/executors/dart/test/browser_test.dart b/executors/dart/test/misc_test.dart
similarity index 55%
rename from executors/dart/test/browser_test.dart
rename to executors/dart/test/misc_test.dart
index 72a85d58..976f4e17 100644
--- a/executors/dart/test/browser_test.dart
+++ b/executors/dart/test/misc_test.dart
@@ -2,8 +2,11 @@ import 'dart:async';
 import 'dart:convert';
 
 import 'package:dart_executor/collator.dart';
+import 'package:dart_executor/datetime_format.dart';
 import 'package:dart_executor/lang_names.dart';
 import 'package:dart_executor/numberformat.dart';
+import 'package:intl4x/datetime_format.dart';
+import 'package:intl4x/intl4x.dart';
 import 'package:meta/meta.dart';
 import 'package:test/test.dart';
 
@@ -57,6 +60,58 @@ void main() {
     final decoded = jsonDecode(outputLine) as Map<String, dynamic>;
     expect(decoded['result'], 'Spanish');
   });
+
+  testWithFormatting('decimal format compact', () {
+    final input = {
+      'label': '0730',
+      'locale': 'es-MX',
+      'skeleton': 'compact-short unit-width-narrow @@',
+      'input': '91827.3645',
+      'options': {
+        'notation': 'compact',
+        'compactDisplay': 'short',
+        'unitDisplay': 'narrow',
+        'currencyDisplay': 'narrowSymbol',
+        'maximumSignificantDigits': 2,
+        'minimumSignificantDigits': 2,
+      },
+      'hexhash': '95514d4fd3ab3f2a24c86bb0e0f21c8f7ec57142',
+    };
+    final outputLine = testDecimalFormatWrapped(jsonEncode(input));
+    final output = jsonDecode(outputLine) as Map<String, dynamic>;
+    expect(output['result'], '92 k');
+  }, skip: 'Failing for now');
+
+  testWithFormatting('datetime format short', () {
+    final input = {
+      'label': '048',
+      'locale': 'en',
+      'input_string': '2000-01-01T00:00:00Z',
+      'options': {
+        'timeZone': 'Etc/GMT',
+        'calendar': 'gregory',
+        'zoneStyle': 'location',
+        'skeleton': 'MdjmsVVVV',
+        'semanticSkeleton': 'MDTZ',
+        'semanticSkeletonLength': 'short',
+      },
+      'tz_offset_secs': 0,
+      'original_input': '2000-01-01T00:00Z[Etc/GMT]',
+      'hexhash': '3b045161836e839e3d19eefc37c1d6923ba63615',
+    };
+    final outputLine = testDateTimeFmt(jsonEncode(input));
+    final output = jsonDecode(outputLine) as Map<String, dynamic>;
+    print(
+      Intl(locale: Locale.parse(input['locale'] as String))
+          .dateTimeFormat(DateTimeFormatOptions())
+          .ymdt(
+            dateStyle: DateFormatStyle.short,
+            timeStyle: TimeFormatStyle.short,
+          )
+          .format(DateTime.parse(input['input_string'] as String)),
+    );
+    expect(output['result'], '1/1, 12:00:00 AM GMT');
+  }, skip: 'Failing for now');
 }
 
 @isTest
diff --git a/generateDataAndRun.sh b/generateDataAndRun.sh
index 672b3195..d812f093 100755
--- a/generateDataAndRun.sh
+++ b/generateDataAndRun.sh
@@ -48,8 +48,9 @@ mkdir -p $TEMP_DIR/testData
 # Generates all new test data
 source_file=${1:-'run_config.json'}
 pushd testgen
+all_test_types=$(jq '.[].run.test_type' ../$source_file | jq -s '.' | jq 'add' | jq 'unique' | jq -r 'join(" ")')
 all_icu_versions=$(jq '.[].run.icu_version' ../$source_file | jq -s '.' | jq 'unique' | jq -r 'join(" ")')
-python3 testdata_gen.py  --icu_versions $all_icu_versions
+python3 testdata_gen.py  --icu_versions $all_icu_versions --test_types $all_test_types
 # And copy results to subdirectories.
 cp -r icu* ../$TEMP_DIR/testData
 popd
@@ -145,7 +146,6 @@ popd
 mkdir -p $TEMP_DIR/testReports
 pushd verifier
 
-all_test_types=$(jq '.[].run.test_type' ../$source_file | jq -s '.' | jq 'add' | jq 'unique' | jq -r 'join(" ")')
 all_execs=$(jq -r 'join(" ")' <<< $all_execs_json)
 
 # Specifies the arrangement of the columns in the summary dashboard
diff --git a/run_config.json b/run_config.json
index 369e5f7d..7ea7a446 100644
--- a/run_config.json
+++ b/run_config.json
@@ -224,7 +224,7 @@
   },
   {
     "run": {
-      "icu_version": "icu74",
+      "icu_version": "icu77",
       "exec": "dart_native",
       "test_type": [
         "collation",
@@ -236,6 +236,26 @@
       "per_execution": 10000
     }
   },
+  {
+    "prereq": {
+      "name": "nvm 24.0.0, icu77.1",
+      "version": "24.0.0",
+      "command": "nvm install 24.0.0;nvm use 24.0.0 --silent"
+    },
+    "run": {
+      "icu_version": "icu76",
+      "exec": "dart_web",
+      "test_type": [
+        "collation",
+        "datetime_fmt",
+        "number_fmt",
+        "lang_names",
+        "plural_rules",
+        "list_fmt"
+      ],
+      "per_execution": 10000
+    }
+  },
   {
     "prereq": {
       "name": "nvm",