diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_6/Math/log10-approx.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_6/Math/log10-approx.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+assertNear(Math.log10(2), 0.3010299956639812);
+assertNear(Math.log10(7), 0.8450980400142568);
+assertNear(Math.log10(Math.E), Math.LOG10E);
+
+for (var i = -10; i < 10; i++)
+    assertNear(Math.log10(Math.pow(10, i)), i);
+
+reportCompare(0, 0, 'ok');
+