Implement math.gcd in dart.

tests/lib/math/math_test.dart

 // Copyright (c) 2011, 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 math_test;
 import "package:expect/expect.dart";
 import 'dart:math';
 
 class MathTest {
   static void testConstants() {
@@ skipping 114 matching lines @@
   static void testSqrt() {
     checkVeryClose(2.0, sqrt(4.0));
     checkVeryClose(SQRT2, sqrt(2.0));
     checkVeryClose(SQRT1_2, sqrt(0.5));
     checkVeryClose(1e50, sqrt(1e100));
     checkVeryClose(1.1111111061110855443054405046358901279277111935183977e56,
                    sqrt(12345678901234e99));
   }
 
   static void testExp() {
+    final double EPSILON = 1e-15;

[Lasse Reichstein Nielsen, 2014/08/20 12:17:03]

Unnecessary change.

[srawlins, 2014/08/25 05:43:54]

Done.

     checkVeryClose(E, exp(1.0));
-    final EPSILON = 1e-15;
     checkClose(10.0, exp(LN10), EPSILON);
     checkClose(2.0, exp(LN2), EPSILON);
   }
 
   static void testLog() {
     // Even though E is imprecise, it is good enough to get really close to 1.
     // We still provide an epsilon.
     checkClose(1.0, log(E), 1e-16);
     checkVeryClose(LN10, log(10.0));
     checkVeryClose(LN2, log(2.0));
@@ skipping 98 matching lines @@
     testSqrt();
     testLog();
     testExp();
     testParseInt();
   }
 }
 
 main() {
   MathTest.testMain();
 }