Fix int.compareTo.

tests/corelib/compare_to2_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.
+// Dart test for testing Math.min and Math.max.
+
+negate(x) => -x;
+
+main() {
+  // Test matrix:
+  var minNonZero = 5e-324;
+  var maxDenormal = 2.225073858507201e-308;
+  var minNormal = 2.2250738585072014e-308;
+  var maxFraction = 0.9999999999999999;
+  var minAbove1 = 1.0000000000000002;
+  var maxNonInt = 4503599627370495.5;
+  var maxNonIntFloorAsDouble = maxNonInt.floor();
+  var maxNonIntFloorAsInt = maxNonIntFloorAsDouble.toInt();
+  var maxExactIntAsDouble = 9007199254740992.0;
+  var maxExactIntAsInt = 9007199254740992;
+  var two53 = 1 << 53;  // Same as maxExactIntAsInt.
+  var two53p1 = two53 + 1;
+  var maxFiniteAsDouble = 1.7976931348623157e+308;
+  var maxFiniteAsInt = maxFiniteAsDouble.toInt();
+  int huge = 1 << 2000;
+  int hugeP1 = huge + 1;
+  var inf = double.INFINITY;
+  var nan = double.NAN;
+  var mnan = negate(nan);
+  var matrix = [
+      -inf,
+      -hugeP1,
+      -huge,
+      [-maxFiniteAsDouble, -maxFiniteAsInt],
+      -two53p1,
+      [-two53, -maxExactIntAsInt, -maxExactIntAsDouble],
+      -maxNonInt,
+      [-maxNonIntFloorAsDouble, -maxNonIntFloorAsInt],
+      [-499.0, -499],
+      -minAbove1,
+      [-1.0, -1],
+      -maxFraction,
+      -minNormal,
+      -maxDenormal,
+      -minNonZero,
+      -0.0,
+      [0,0, 0],
+      minNonZero,
+      maxDenormal,
+      minNormal,
+      maxFraction,
+      [1.0, 1],
+      minAbove1,
+      [499.0, 499],
+      [maxNonIntFloorAsDouble, maxNonIntFloorAsInt],
+      maxNonInt,
+      [two53, maxExactIntAsInt, maxExactIntAsDouble],
+      two53p1,
+      [maxFiniteAsDouble, maxFiniteAsInt],
+      huge,
+      hugeP1,
+      inf,
+      [nan, mnan],
+    ];
+
+  check(left, right, expectedResult) {
+    if (left is List) {
+      for(var x in left) check(x, right, expectedResult);
+      return;
+    }
+    if (right is List) {
+      for(var x in right) check(left, x, expectedResult);
+      return;
+    }
+    int actual = left.compareTo(right);
+    Expect.equals(expectedResult, actual,
+                  "($left).compareTo($right) failed "
+                  "(should have been $expectedResult, was $actual");
+  }
+
+  for (int i = 0; i < matrix.length; i++) {
+    for (int j = 0; j < matrix.length; j++) {
+      var left = matrix[i];
+      var right = matrix[j];
+      if (left is List) {
+        check(left, left, 0);
+      }
+      check(left, right, i == j ? 0 : (i < j ? -1 : 1));
+    }
+  }
+}