Harvest from pub. Mostly a straight copy, except:

test/version_test.dart

+// Copyright (c) 2014, 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.
+
+library pub_semver.test.version_test;
+
+import 'package:unittest/unittest.dart';
+
+import 'package:pub_semver/pub_semver.dart';
+
+import 'utils.dart';
+
+main() {
+  test('none', () {
+    expect(Version.none.toString(), equals('0.0.0'));
+  });
+
+  test('prioritize()', () {
+    // A correctly sorted list of versions in order of increasing priority.
+    var versions = [
+      '1.0.0-alpha',
+      '2.0.0-alpha',
+      '1.0.0',
+      '1.0.0+build',
+      '1.0.1',
+      '1.1.0',
+      '2.0.0'
+    ];
+
+    // Ensure that every pair of versions is prioritized in the order that it
+    // appears in the list.
+    for (var i = 0; i < versions.length; i++) {
+      for (var j = 0; j < versions.length; j++) {
+        var a = new Version.parse(versions[i]);
+        var b = new Version.parse(versions[j]);
+        expect(Version.prioritize(a, b), equals(i.compareTo(j)));
+      }
+    }
+  });
+
+  test('antiprioritize()', () {
+    // A correctly sorted list of versions in order of increasing antipriority.
+    var versions = [
+      '2.0.0-alpha',
+      '1.0.0-alpha',
+      '2.0.0',
+      '1.1.0',
+      '1.0.1',
+      '1.0.0+build',
+      '1.0.0'
+    ];
+
+    // Ensure that every pair of versions is prioritized in the order that it
+    // appears in the list.
+    for (var i = 0; i < versions.length; i++) {
+      for (var j = 0; j < versions.length; j++) {
+        var a = new Version.parse(versions[i]);
+        var b = new Version.parse(versions[j]);
+        expect(Version.antiprioritize(a, b), equals(i.compareTo(j)));
+      }
+    }
+  });
+
+  group('constructor', () {
+    test('throws on negative numbers', () {
+      expect(() => new Version(-1, 1, 1), throwsArgumentError);
+      expect(() => new Version(1, -1, 1), throwsArgumentError);
+      expect(() => new Version(1, 1, -1), throwsArgumentError);
+    });
+  });
+
+  group('comparison', () {
+    // A correctly sorted list of versions.
+    var versions = [
+      '1.0.0-alpha',
+      '1.0.0-alpha.1',
+      '1.0.0-beta.2',
+      '1.0.0-beta.11',
+      '1.0.0-rc.1',
+      '1.0.0-rc.1+build.1',
+      '1.0.0',
+      '1.0.0+0.3.7',
+      '1.3.7+build',
+      '1.3.7+build.2.b8f12d7',
+      '1.3.7+build.11.e0f985a',
+      '2.0.0',
+      '2.1.0',
+      '2.2.0',
+      '2.11.0',
+      '2.11.1'
+    ];
+
+    test('compareTo()', () {
+      // Ensure that every pair of versions compares in the order that it
+      // appears in the list.
+      for (var i = 0; i < versions.length; i++) {
+        for (var j = 0; j < versions.length; j++) {
+          var a = new Version.parse(versions[i]);
+          var b = new Version.parse(versions[j]);
+          expect(a.compareTo(b), equals(i.compareTo(j)));
+        }
+      }
+    });
+
+    test('operators', () {
+      for (var i = 0; i < versions.length; i++) {
+        for (var j = 0; j < versions.length; j++) {
+          var a = new Version.parse(versions[i]);
+          var b = new Version.parse(versions[j]);
+          expect(a < b, equals(i < j));
+          expect(a > b, equals(i > j));
+          expect(a <= b, equals(i <= j));
+          expect(a >= b, equals(i >= j));
+          expect(a == b, equals(i == j));
+          expect(a != b, equals(i != j));
+        }
+      }
+    });
+
+    test('equality', () {
+      expect(new Version.parse('01.2.3'), equals(new Version.parse('1.2.3')));
+      expect(new Version.parse('1.02.3'), equals(new Version.parse('1.2.3')));
+      expect(new Version.parse('1.2.03'), equals(new Version.parse('1.2.3')));
+      expect(new Version.parse('1.2.3-01'),
+          equals(new Version.parse('1.2.3-1')));
+      expect(new Version.parse('1.2.3+01'),
+          equals(new Version.parse('1.2.3+1')));
+    });
+  });
+
+  test('allows()', () {
+    expect(v123, allows(v123));
+    expect(v123, doesNotAllow(
+        new Version.parse('2.2.3'),
+        new Version.parse('1.3.3'),
+        new Version.parse('1.2.4'),
+        new Version.parse('1.2.3-dev'),
+        new Version.parse('1.2.3+build')));
+  });
+
+  test('intersect()', () {
+    // Intersecting the same version returns the version.
+    expect(v123.intersect(v123), equals(v123));
+
+    // Intersecting a different version allows no versions.
+    expect(v123.intersect(v114).isEmpty, isTrue);
+
+    // Intersecting a range returns the version if the range allows it.
+    expect(v123.intersect(new VersionRange(min: v114, max: v124)),
+        equals(v123));
+
+    // Intersecting a range allows no versions if the range doesn't allow it.
+    expect(v114.intersect(new VersionRange(min: v123, max: v124)).isEmpty,
+        isTrue);
+  });
+
+  test('isEmpty', () {
+    expect(v123.isEmpty, isFalse);
+  });
+
+  test('nextMajor', () {
+    expect(v123.nextMajor, equals(v200));
+    expect(v114.nextMajor, equals(v200));
+    expect(v200.nextMajor, equals(v300));
+
+    // Ignores pre-release if not on a major version.
+    expect(new Version.parse('1.2.3-dev').nextMajor, equals(v200));
+
+    // Just removes it if on a major version.
+    expect(new Version.parse('2.0.0-dev').nextMajor, equals(v200));
+
+    // Strips build suffix.
+    expect(new Version.parse('1.2.3+patch').nextMajor, equals(v200));
+  });
+
+  test('nextMinor', () {
+    expect(v123.nextMinor, equals(v130));
+    expect(v130.nextMinor, equals(v140));
+
+    // Ignores pre-release if not on a minor version.
+    expect(new Version.parse('1.2.3-dev').nextMinor, equals(v130));
+
+    // Just removes it if on a minor version.
+    expect(new Version.parse('1.3.0-dev').nextMinor, equals(v130));
+
+    // Strips build suffix.
+    expect(new Version.parse('1.2.3+patch').nextMinor, equals(v130));
+  });
+
+  test('nextPatch', () {
+    expect(v123.nextPatch, equals(v124));
+    expect(v200.nextPatch, equals(v201));
+
+    // Just removes pre-release version if present.
+    expect(new Version.parse('1.2.4-dev').nextPatch, equals(v124));
+
+    // Strips build suffix.
+    expect(new Version.parse('1.2.3+patch').nextPatch, equals(v124));
+  });
+
+  test('parse()', () {
+    expect(new Version.parse('0.0.0'), equals(new Version(0, 0, 0)));
+    expect(new Version.parse('12.34.56'), equals(new Version(12, 34, 56)));
+
+    expect(new Version.parse('1.2.3-alpha.1'),
+        equals(new Version(1, 2, 3, pre: 'alpha.1')));
+    expect(new Version.parse('1.2.3-x.7.z-92'),
+        equals(new Version(1, 2, 3, pre: 'x.7.z-92')));
+
+    expect(new Version.parse('1.2.3+build.1'),
+        equals(new Version(1, 2, 3, build: 'build.1')));
+    expect(new Version.parse('1.2.3+x.7.z-92'),
+        equals(new Version(1, 2, 3, build: 'x.7.z-92')));
+
+    expect(new Version.parse('1.0.0-rc-1+build-1'),
+        equals(new Version(1, 0, 0, pre: 'rc-1', build: 'build-1')));
+
+    expect(() => new Version.parse('1.0'), throwsFormatException);
+    expect(() => new Version.parse('1.2.3.4'), throwsFormatException);
+    expect(() => new Version.parse('1234'), throwsFormatException);
+    expect(() => new Version.parse('-2.3.4'), throwsFormatException);
+    expect(() => new Version.parse('1.3-pre'), throwsFormatException);
+    expect(() => new Version.parse('1.3+build'), throwsFormatException);
+    expect(() => new Version.parse('1.3+bu?!3ild'), throwsFormatException);
+  });
+
+  group('toString()', () {
+    test('returns the version string', () {
+      expect(new Version(0, 0, 0).toString(), equals('0.0.0'));
+      expect(new Version(12, 34, 56).toString(), equals('12.34.56'));
+
+      expect(new Version(1, 2, 3, pre: 'alpha.1').toString(),
+          equals('1.2.3-alpha.1'));
+      expect(new Version(1, 2, 3, pre: 'x.7.z-92').toString(),
+          equals('1.2.3-x.7.z-92'));
+
+      expect(new Version(1, 2, 3, build: 'build.1').toString(),
+          equals('1.2.3+build.1'));
+      expect(new Version(1, 2, 3, pre: 'pre', build: 'bui').toString(),
+          equals('1.2.3-pre+bui'));
+    });
+
+    test('preserves leading zeroes', () {
+      expect(new Version.parse('001.02.0003-01.dev+pre.002').toString(),
+          equals('001.02.0003-01.dev+pre.002'));
+    });
+  });
+}