Fraction class prototype and test (not to be committed).

tests/language/vm/fraction_test.dart

+// Copyright (c) 2016, 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.
+
+import "package:expect/expect.dart";
+
+testAdd() {
+  var a = 1.23r;
+  Expect.equals(1.33r, a + 0.1r);
+  Expect.equals(2.0r, a + 0.77r);
+  Expect.equals(1.51, 1.5r + 0.01);
+  Expect.equals(1.33r, 0.1r + a);
+  Expect.equals(2.0r, 0.77r + a);
+  Expect.equals(1.51, 0.01 + 1.5r);
+  Expect.equals(2.5r, 1 + 1.5r);
+  Expect.equals(2.5r, 1.5r + 1);
+}
+
+testSub() {
+  var a = 1.23r;
+  Expect.equals(1.13r, a - 0.1r);
+  Expect.equals(1.0r, a - .23r);
+  Expect.equals(1.1, a - 0.13);
+  Expect.equals(.23r, a - 1);
+  Expect.equals(-1.13r, 0.1r - a);
+  Expect.equals(-1.13, 0.1 - a);
+}
+
+testMul() {
+  Expect.equals(.375r, 1.5r * .25r);
+  Expect.equals(.25r, 1 * .25r);
+  Expect.equals(.25, 1.0 * .25r);
+  Expect.equals(.25r, .25r * 1);
+  Expect.equals(.25, .25r * 1.0);
+}
+
+testDiv() {
+  Expect.equals(6.0r, 1.5r / .25r);
+  Expect.equals(.75r, 1.5r / 2r);
+  Expect.equals(.75, 1.5r / 2);
+  Expect.equals(4/3r, 2/1.5r);
+  Expect.equals(.8, 1.6r / 2);
+}
+
+testTruncDiv() {
+  Expect.equals(6, 1.5r ~/ .25r);
+  Expect.equals(0, 1.5r ~/ 2r);
+  Expect.equals(0, 1.5r ~/ 2);
+  Expect.equals(1, 2r ~/ 1.5r);
+  Expect.equals(0, 1.6r ~/ 2);
+}
+
+testMod() {
+  Expect.equals(0.3r, 1.8r % .5r);
+  Expect.equals(0.3r, 1.8r % -.5r);
+
+  Expect.equals(2.0r, 5 % 3.0r);
+  Expect.equals(1.0r, -5 % 3.0r);
+  Expect.equals(1.0r, -5 % -3.0r);
+  Expect.equals(2.0r, 5 % -3.0r);
+
+  Expect.equals(2.0r, 5.0r % 3);
+  Expect.equals(1.0r, -5.0r % 3);
+  Expect.equals(1.0r, -5.0r % -3);
+  Expect.equals(2.0r, 5.0r % -3);
+
+  Expect.equals(2.0, 5.0 % 3.0r);
+  Expect.equals(1.0, -5.0 % 3.0r);
+  Expect.equals(1.0, -5.0 % -3.0r);
+  Expect.equals(2.0, 5.0 % -3.0r);
+
+  Expect.equals(2.0, 5.0r % 3.0);
+  Expect.equals(1.0, -5.0r % 3.0);
+  Expect.equals(1.0, -5.0r % -3.0);
+  Expect.equals(2.0, 5.0r % -3.0);
+}
+
+testRemainder() {
+  Expect.equals(0.3r, (1.8r).remainder(.5r));
+  Expect.equals(0.3r, (1.8r).remainder(-.5r));
+
+  Expect.equals(2.0r, (5).remainder(3.0r));
+  Expect.equals(-2.0r, (-5).remainder(3.0r));
+  Expect.equals(-2.0r, (-5).remainder(-3.0r));
+  Expect.equals(2.0r, (5).remainder(-3.0r));
+
+  Expect.equals(2.0r, (5.0r).remainder(3));
+  Expect.equals(-2.0r, (-5.0r).remainder(3));
+  Expect.equals(-2.0r, (-5.0r).remainder(-3));
+  Expect.equals(2.0r, (5.0r).remainder(-3));
+
+  Expect.equals(2.0, (5.0).remainder(3.0r));
+  Expect.equals(-2.0, (-5.0).remainder(3.0r));
+  Expect.equals(-2.0, (-5.0).remainder(-3.0r));
+  Expect.equals(2.0, (5.0).remainder(-3.0r));
+
+  Expect.equals(2.0, (5.0r).remainder(3.0));
+  Expect.equals(-2.0, (-5.0r).remainder(3.0));
+  Expect.equals(-2.0, (-5.0r).remainder(-3.0));
+  Expect.equals(2.0, (5.0r).remainder(-3.0));
+}
+
+main() {
+  var a = 1.23r;
+  Expect.isTrue(a is num);
+  Expect.isFalse(a is! num);
+  Expect.isTrue(a is fraction);
+  Expect.isFalse(a is! fraction);
+  Expect.isFalse(a is int);
+  Expect.isTrue(a is! int);
+  Expect.isFalse(a is double);
+  Expect.isTrue(a is! double);
+  testAdd();
+  testSub();
+  testMul();
+  testDiv();
+  testTruncDiv();
+  testMod();
+  testRemainder();
+  Expect.equals(1.5r, (-1.5r).abs());
+  Expect.equals(1.5r, (1.5r).abs());
+
+  Expect.equals(1, (1.5r).truncate());
+  Expect.equals(1, (1.2r).truncate());
+  Expect.equals(1, (1.9r).truncate());
+  Expect.equals(-1, (-1.5r).truncate());
+  Expect.equals(-1, (-1.2r).truncate());
+  Expect.equals(-1, (-1.9r).truncate());
+  Expect.equals(10000000000000000000, (10000000000000000000.1r).truncate());
+  Expect.equals(-10000000000000000000, (-10000000000000000000.1r).truncate());
+
+  Expect.equals(3, (2.1r).ceil());
+  Expect.equals(-2, (-2.1r).ceil());
+  Expect.equals(10000000000000000001, (10000000000000000000.1r).ceil());
+  Expect.equals(-10000000000000000000, (-10000000000000000000.1r).ceil());
+
+  Expect.equals(2, (2.1r).floor());
+  Expect.equals(-3, (-2.1r).floor());
+  Expect.equals(10000000000000000000, (10000000000000000000.1r).floor());
+  Expect.equals(10000000000000000000, (10000000000000000000.8r).floor());
+  Expect.equals(-10000000000000000001, (-10000000000000000000.1r).floor());
+  Expect.equals(-10000000000000000001, (-10000000000000000000.8r).floor());
+  Expect.equals(-10000000000000000000, (-10000000000000000000.0r).floor());
+  Expect.equals(-1, (-0.5r).floor());
+  Expect.equals(0, (0.5r).floor());
+
+  Expect.equals(3, (2.6r).round());
+  Expect.equals(2, (1.5r).round());
+  Expect.equals(-3, (-2.6r).round());
+  Expect.equals(-2, (-1.5r).round());
+  Expect.equals(10000000000000000000, (10000000000000000000.1r).round());
+  Expect.equals(10000000000000000001, (10000000000000000000.5r).round());
+  Expect.equals(10000000000000000001, (10000000000000000000.8r).round());
+  Expect.equals(-10000000000000000000, (-10000000000000000000.1r).round());
+  Expect.equals(-10000000000000000001, (-10000000000000000000.5r).round());
+  Expect.equals(-10000000000000000001, (-10000000000000000000.8r).round());
+
+  Expect.equals(0, 1r.compareTo(1r));
+  Expect.equals(0, 1r.compareTo(1));
+  Expect.equals(0, 1.compareTo(1r));
+  Expect.equals(-1, (-1r).compareTo(1r));
+  Expect.equals(-1, (-1r).compareTo(1));
+  Expect.equals(-1, (-1).compareTo(1r));
+  Expect.equals(1, 1r.compareTo(-1r));
+  Expect.equals(1, 1r.compareTo(-1));
+  Expect.equals(1, 1.compareTo(-1r));
+  Expect.equals(1r, 1r);
+  Expect.equals(1r, 1.0);
+  Expect.equals(1.0, 1r);
+  Expect.equals(1r, 1);
+  Expect.equals(1, 1r);
+
+  // Test if double is contagious:
+  { double d = 1r + 1.0; }
+  { double d = 1r / 1.0; }
+  { double d = 1r * 1.0; }
+  { double d = 0r * 1.0; }
+  { double d = 1.0 / 0r; }
+  { double d = 1r - 1.0; }
+
+  // isNegative.
+  Expect.isFalse((1.5r).isNegative);
+  Expect.isFalse((0.0r).isNegative);
+  Expect.isTrue((-1.0r).isNegative);
+
+  // isInfinite, isFinite, isNaN.
+  Expect.isFalse((0.0r).isInfinite);
+  Expect.isFalse((0.0r).isNaN);
+  Expect.isTrue((0.0r).isFinite);
+  Expect.isFalse((-1.0r).isInfinite);
+  Expect.isFalse((-1.0r).isNaN);
+  Expect.isTrue((-1.0r).isFinite);
+  Expect.isFalse((1.0r).isInfinite);
+  Expect.isFalse((1.0r).isNaN);
+  Expect.isTrue((1.0r).isFinite);
+  Expect.isTrue((1.0r/0.0r).isInfinite);
+  Expect.isFalse((1.0r/0.0r).isNaN);
+  Expect.isFalse((1.0r/0.0r).isFinite);
+  Expect.isFalse((0.0r/0.0r).isInfinite);
+  Expect.isTrue((0.0r/0.0r).isNaN);
+  Expect.isFalse((0.0r/0.0r).isFinite);
+  Expect.isTrue(fraction.INFINITY.isInfinite);
+  Expect.isFalse(fraction.INFINITY.isNaN);
+  Expect.isFalse(fraction.INFINITY.isFinite);
+  Expect.isTrue(fraction.NEGATIVE_INFINITY.isInfinite);
+  Expect.isFalse(fraction.NEGATIVE_INFINITY.isNaN);
+  Expect.isFalse(fraction.NEGATIVE_INFINITY.isFinite);
+  Expect.isFalse(fraction.NAN.isInfinite);
+  Expect.isTrue(fraction.NAN.isNaN);
+  Expect.isFalse(fraction.NAN.isFinite);
+
+  // sign.
+  Expect.equals(1r, (1.9r).sign);
+  Expect.equals(0r, (0.0r).sign);
+  Expect.equals(-1r, (-1.9r).sign);
+  Expect.equals(1r, fraction.INFINITY.sign);
+  Expect.equals(0r, fraction.NAN.sign);
+  Expect.equals(-1r, fraction.NEGATIVE_INFINITY.sign);
+
+  // toInt.
+  Expect.equals(1, (1.9r).toInt());
+  Expect.equals(0, (0.0r).toInt());
+  Expect.equals(-1, (-1.9r).toInt());
+  // Test type.
+  { int i = (1.9r).toInt(); }
+  { int i = (0.0r).toInt(); }
+  { int i = (-1.9r).toInt(); }
+
+  // toDouble.
+  Expect.equals(1.9, (1.9r).toDouble());
+  Expect.equals(0.0, (0.0r).toDouble());
+  Expect.equals(-1.9, (-1.9r).toDouble());
+  // Test type.
+  { double d = (1.9r).toDouble(); }
+  { double d = (0.0r).toDouble(); }
+  { double d = (-1.9r).toDouble(); }
+}