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packages/quiver/test/time/clock_test.dart

Index: packages/quiver/test/time/clock_test.dart
diff --git a/packages/quiver/test/time/clock_test.dart b/packages/quiver/test/time/clock_test.dart
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+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the 'License');
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an 'AS IS' BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+library quiver.time.clock_test;
+
+import 'package:test/test.dart';
+import 'package:quiver/time.dart';
+
+Clock from(int y, int m, int d) => new Clock.fixed(new DateTime(y, m, d));
+
+expectDate(DateTime date, int y, [int m = 1, int d = 1]) {
+  expect(date, new DateTime(y, m, d));
+}
+
+main() {
+  group('clock', () {
+    Clock subject;
+
+    setUp(() {
+      subject = new Clock.fixed(new DateTime(2013));
+    });
+
+    test('should return a non-null value from system clock', () {
+      expect(const Clock().now(), isNotNull);
+    });
+
+    // This test may be flaky on certain systems. I ran it over 10 million
+    // cycles on my machine without any failures, but that's no guarantee.
+    test('should be close enough to system clock', () {
+      // At 10ms the test doesn't seem to be flaky.
+      var epsilon = 10;
+      expect(
+          new DateTime.now().difference(new Clock().now()).inMilliseconds.abs(),
+          lessThan(epsilon));
+      expect(new DateTime.now().difference(const Clock().now()).inMilliseconds
+          .abs(), lessThan(epsilon));
+    });
+
+    test('should return time provided by custom TimeFunction', () {
+      var time = new DateTime(2013);
+      var fixedClock = new Clock(() => time);
+      expect(fixedClock.now(), new DateTime(2013));
+
+      time = new DateTime(2014);
+      expect(fixedClock.now(), new DateTime(2014));
+    });
+
+    test('should return fixed time', () {
+      expect(new Clock.fixed(new DateTime(2013)).now(), new DateTime(2013));
+    });
+
+    test('should return time Duration ago', () {
+      expect(subject.agoBy(new Duration(days: 366)), new DateTime(2012));
+    });
+
+    test('should return time Duration from now', () {
+      expect(subject.fromNowBy(new Duration(days: 365)), new DateTime(2014));
+    });
+
+    test('should return time parts ago', () {
+      expect(subject.ago(
+          days: 1,
+          hours: 1,
+          minutes: 1,
+          seconds: 1,
+          milliseconds: 1,
+          microseconds: 1000), new DateTime(2012, 12, 30, 22, 58, 58, 998));
+    });
+
+    test('should return time parts from now', () {
+      expect(subject.fromNow(
+          days: 1,
+          hours: 1,
+          minutes: 1,
+          seconds: 1,
+          milliseconds: 1,
+          microseconds: 1000), new DateTime(2013, 1, 2, 1, 1, 1, 2));
+    });
+
+    test('should return time micros ago', () {
+      expect(
+          subject.microsAgo(1000), new DateTime(2012, 12, 31, 23, 59, 59, 999));
+    });
+
+    test('should return time micros from now', () {
+      expect(subject.microsFromNow(1000), new DateTime(2013, 1, 1, 0, 0, 0, 1));
+    });
+
+    test('should return time millis ago', () {
+      expect(
+          subject.millisAgo(1000), new DateTime(2012, 12, 31, 23, 59, 59, 000));
+    });
+
+    test('should return time millis from now', () {
+      expect(subject.millisFromNow(3), new DateTime(2013, 1, 1, 0, 0, 0, 3));
+    });
+
+    test('should return time seconds ago', () {
+      expect(
+          subject.secondsAgo(10), new DateTime(2012, 12, 31, 23, 59, 50, 000));
+    });
+
+    test('should return time seconds from now', () {
+      expect(subject.secondsFromNow(3), new DateTime(2013, 1, 1, 0, 0, 3, 0));
+    });
+
+    test('should return time minutes ago', () {
+      expect(
+          subject.minutesAgo(10), new DateTime(2012, 12, 31, 23, 50, 0, 000));
+    });
+
+    test('should return time minutes from now', () {
+      expect(subject.minutesFromNow(3), new DateTime(2013, 1, 1, 0, 3, 0, 0));
+    });
+
+    test('should return time hours ago', () {
+      expect(subject.hoursAgo(10), new DateTime(2012, 12, 31, 14, 0, 0, 000));
+    });
+
+    test('should return time hours from now', () {
+      expect(subject.hoursFromNow(3), new DateTime(2013, 1, 1, 3, 0, 0, 0));
+    });
+
+    test('should return time days ago', () {
+      expectDate(subject.daysAgo(10), 2012, 12, 22);
+    });
+
+    test('should return time days from now', () {
+      expectDate(subject.daysFromNow(3), 2013, 1, 4);
+    });
+
+    test('should return time months ago on the same date', () {
+      expectDate(subject.monthsAgo(1), 2012, 12, 1);
+      expectDate(subject.monthsAgo(2), 2012, 11, 1);
+      expectDate(subject.monthsAgo(3), 2012, 10, 1);
+      expectDate(subject.monthsAgo(4), 2012, 9, 1);
+    });
+
+    test('should return time months from now on the same date', () {
+      expectDate(subject.monthsFromNow(1), 2013, 2, 1);
+      expectDate(subject.monthsFromNow(2), 2013, 3, 1);
+      expectDate(subject.monthsFromNow(3), 2013, 4, 1);
+      expectDate(subject.monthsFromNow(4), 2013, 5, 1);
+    });
+
+    test('should go from 2013-05-31 to 2012-11-30', () {
+      expectDate(from(2013, 5, 31).monthsAgo(6), 2012, 11, 30);
+    });
+
+    test('should go from 2013-03-31 to 2013-02-28 (common year)', () {
+      expectDate(from(2013, 3, 31).monthsAgo(1), 2013, 2, 28);
+    });
+
+    test('should go from 2013-05-31 to 2013-02-28 (common year)', () {
+      expectDate(from(2013, 5, 31).monthsAgo(3), 2013, 2, 28);
+    });
+
+    test('should go from 2004-03-31 to 2004-02-29 (leap year)', () {
+      expectDate(from(2004, 3, 31).monthsAgo(1), 2004, 2, 29);
+    });
+
+    test('should go from 2013-03-31 to 2013-06-30', () {
+      expectDate(from(2013, 3, 31).monthsFromNow(3), 2013, 6, 30);
+    });
+
+    test('should go from 2003-12-31 to 2004-02-29 (common to leap)', () {
+      expectDate(from(2003, 12, 31).monthsFromNow(2), 2004, 2, 29);
+    });
+
+    test('should go from 2004-02-29 to 2003-02-28 by year', () {
+      expectDate(from(2004, 2, 29).yearsAgo(1), 2003, 2, 28);
+    });
+
+    test('should go from 2004-02-29 to 2003-02-28 by month', () {
+      expectDate(from(2004, 2, 29).monthsAgo(12), 2003, 2, 28);
+    });
+
+    test('should go from 2004-02-29 to 2005-02-28 by year', () {
+      expectDate(from(2004, 2, 29).yearsFromNow(1), 2005, 2, 28);
+    });
+
+    test('should go from 2004-02-29 to 2005-02-28 by month', () {
+      expectDate(from(2004, 2, 29).monthsFromNow(12), 2005, 2, 28);
+    });
+
+    test('should return time years ago on the same date', () {
+      expectDate(subject.yearsAgo(1), 2012, 1, 1); // leap year
+      expectDate(subject.yearsAgo(2), 2011, 1, 1);
+      expectDate(subject.yearsAgo(3), 2010, 1, 1);
+      expectDate(subject.yearsAgo(4), 2009, 1, 1);
+      expectDate(subject.yearsAgo(5), 2008, 1, 1); // leap year
+      expectDate(subject.yearsAgo(6), 2007, 1, 1);
+      expectDate(subject.yearsAgo(30), 1983, 1, 1);
+      expectDate(subject.yearsAgo(2013), 0, 1, 1);
+    });
+
+    test('should return time years from now on the same date', () {
+      expectDate(subject.yearsFromNow(1), 2014, 1, 1);
+      expectDate(subject.yearsFromNow(2), 2015, 1, 1);
+      expectDate(subject.yearsFromNow(3), 2016, 1, 1);
+      expectDate(subject.yearsFromNow(4), 2017, 1, 1);
+      expectDate(subject.yearsFromNow(5), 2018, 1, 1);
+      expectDate(subject.yearsFromNow(6), 2019, 1, 1);
+      expectDate(subject.yearsFromNow(30), 2043, 1, 1);
+      expectDate(subject.yearsFromNow(1000), 3013, 1, 1);
+    });
+  });
+}