Cleanup of mjsunit.js code and make assertEquals more strict.

test/mjsunit/math-abs.js

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 17 matching lines @@
 // Flags: --max-new-space-size=256
 
 function zero() {
   var x = 0.5;
   return (function() { return x - 0.5; })();
 }
 
 function test() {
   assertEquals(0, Math.abs(0));
   assertEquals(0, Math.abs(zero()));
-  assertEquals(1/0, 1/Math.abs(-0));  // 0 == -0, so we use reciprocals.
+  assertEquals(0, Math.abs(-0));
   assertEquals(Infinity, Math.abs(Infinity));
   assertEquals(Infinity, Math.abs(-Infinity));
-  assertNaN(Math.abs(NaN));
-  assertNaN(Math.abs(-NaN));
-  assertEquals('Infinity', Math.abs(Number('+Infinity').toString()));
-  assertEquals('Infinity', Math.abs(Number('-Infinity').toString()));
+  assertEquals(NaN, Math.abs(NaN));
+  assertEquals(NaN, Math.abs(-NaN));
+  assertEquals('Infinity', Math.abs(Number('+Infinity')).toString());
+  assertEquals('Infinity', Math.abs(Number('-Infinity')).toString());
   assertEquals('NaN', Math.abs(NaN).toString());
   assertEquals('NaN', Math.abs(-NaN).toString());
 
   assertEquals(0.1, Math.abs(0.1));
   assertEquals(0.5, Math.abs(0.5));
   assertEquals(0.1, Math.abs(-0.1));
   assertEquals(0.5, Math.abs(-0.5));
   assertEquals(1, Math.abs(1));
   assertEquals(1.1, Math.abs(1.1));
   assertEquals(1.5, Math.abs(1.5));
@@ skipping 23 matching lines @@
 
   assertEquals(two_31, Math.abs(two_31));
   assertEquals(two_31, Math.abs(-two_31));
 
   assertEquals(two_31 + 1, Math.abs(two_31 + 1));
   assertEquals(two_31 + 1, Math.abs(-two_31 - 1));
 
   assertEquals(two_31 - 1, Math.abs(two_31 - 1));
   assertEquals(two_31 - 1, Math.abs(-two_31 + 1));
 
-  assertNaN(Math.abs("not a number"));
-  assertNaN(Math.abs([1, 2, 3]));
+  assertEquals(NaN, Math.abs("not a number"));
+  assertEquals(NaN, Math.abs([1, 2, 3]));
   assertEquals(42, Math.abs({valueOf: function() { return 42; } }));
   assertEquals(42, Math.abs({valueOf: function() { return -42; } }));
 }
 
 
 // Test in a loop to cover the custom IC and GC-related issues.
 for (var i = 0; i < 500; i++) {
   test();
 }