- Add a math library. Currently it mostly matches the Math class in dart:core.

tests/lib/math/pi_test.dart

Index: tests/lib/math/pi_test.dart
===================================================================
--- tests/lib/math/pi_test.dart	(revision 0)
+++ tests/lib/math/pi_test.dart	(revision 0)
@@ -0,0 +1,30 @@
+// 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");
+
+#import("dart:math");
+
+void main() {
+  var prng = new Random();
+  var outside = 0;
+  var inside = 0;
+  for (var i = 0; i < 600000; i++) {
+    var x = prng.nextDouble();
+    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));
+}