diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_6/Number/20.1.2.10-MIN_SAFE_INTEGER.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_6/Number/20.1.2.10-MIN_SAFE_INTEGER.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+
+var BUGNUMBER = 885798;
+var summary = "ES6 (draft April 2014) 20.1.2.10 Number.MIN_SAFE_INTEGER";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+// Test value
+assertEq(Number.MIN_SAFE_INTEGER, -(Math.pow(2, 53) - 1));
+
+//Test property attributes
+var descriptor = Object.getOwnPropertyDescriptor(Number, 'MIN_SAFE_INTEGER');
+
+assertEq(descriptor.writable, false);
+assertEq(descriptor.configurable, false);
+assertEq(descriptor.enumerable, false);
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);