Add assert.isNull
@@ -321,6 +321,12 @@ assert.isUndefined = function(value, opt_message) {};
*/
assert.isDefined = function(value, opt_message) {};
+/**
+ * @param {*} value
+ * @param {string=} opt_message
+ */
+assert.isNull = function(value, opt_message) {};
+
/**
* @param {*} object
* @param {function(new: Object)} constructor
