diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/number-isfinite.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/number-isfinite.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+assertEq(Number.isFinite(Infinity), false);
+assertEq(Number.isFinite(-Infinity), false);
+assertEq(Number.isFinite(NaN), false);
+assertEq(Number.isFinite(4), true);
+assertEq(Number.isFinite(4.5), true);
+assertEq(Number.isFinite("hi"), false);
+assertEq(Number.isFinite("1.3"), false);
+assertEq(Number.isFinite("51"), false);
+assertEq(Number.isFinite(0), true);
+assertEq(Number.isFinite(-0), true);
+assertEq(Number.isFinite({valueOf: function () { return 3; }}), false);
+assertEq(Number.isFinite({valueOf: function () { return 0/0; }}), false);
+assertEq(Number.isFinite({ valueOf: function() { throw 17; } }), false);
+assertEq(Number.isFinite({ toString: function() { throw 17; } }), false);
+assertEq(Number.isFinite({ valueOf: function() { throw 17; }, toString: function() { throw 42; } }), false);