- Make bounds for pi_test symmetric.

tests/lib/math/pi_test.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.
 
 // Test that the default PRNG does converge towards Pi when doing a Monte Carlo
 // simulation.
 
 // Library tag to allow Dartium to run the test.
 #library("pi_test.dart");
 
@@ skipping 10 matching lines @@
     var y = prng.nextDouble();
     if ((x*x) + (y*y) < 1.0) {
       inside++;
     } else {
       outside++;
     }
   }
   // Mmmmh, Pie!
   var pie = 4.0 * (inside/(inside + outside));
   print("$pie");
-  Expect.isTrue((3.14 < pie) && (pie < 3.15));
+  Expect.isTrue(((PI - 0.009) < pie) && (pie < (PI + 0.009)));
 }