isEven, isOdd, isNegative, isMaxValue, isMinValue, isInfinite, isPositive, isSingleValue.

pkg/intl/test/date_time_format_test_core.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Tests the DateFormat library in dart. This file contains core tests that
  * are run regardless of where the locale data is found, so it doesn't expect to
  * be run on its own, but rather to be imported and run from another test file.
  */
 
@@ skipping 159 matching lines @@
 
 /** A shortcut for returning all the locales we have available.*/
 List<String> allLocales() => DateFormat.allLocalesWithSymbols();
 
 /**
  * Return only the odd-numbered locales. A simple way to divide the list into
  * two roughly equal parts.
  */
 List oddLocales() {
   int i = 1;
-  return allLocales().filter((x) => (i++).isOdd());
+  return allLocales().filter((x) => (i++).isOdd);
 }
 
 /**
  * Return a set of a few locales to run just the tests on a small sample.
  */
 List smallSetOfLocales() {
   return allLocales().getRange(0,10);
 }
 
 /**
  * Return only the even-numbered locales. A simple way to divide the list into
  * two roughly equal parts.
  */
 List evenLocales() {
   int i = 1;
-  return allLocales().filter((x) => !((i++).isOdd()));
+  return allLocales().filter((x) => !((i++).isOdd));
 }
 
 // TODO(alanknight): Run specific tests for the en_ISO locale which isn't
 // included in CLDR, and check that our patterns for it are correct (they
 // very likely aren't).
 runDateTests([List<String> subset]) {
   test('Multiple patterns', () {
     var date = new Date.now();
     var multiple1 = new DateFormat.yMd().add_jms();
     var multiple2 = new DateFormat("yMd").add_jms();
@@ skipping 131 matching lines @@
 
   test('Test default format', () {
     var someDate = new Date(2012, 1, 27, 20, 58, 59, 1);
     var emptyFormat = new DateFormat(null, "en_US");
     var knownDefault = new DateFormat.yMMMMd("en_US").add_jms();
     var result = emptyFormat.format(someDate);
     var knownResult = knownDefault.format(someDate);
     expect(result, knownResult);
   });
 }