Test coverage: last branch untested from PublicKey

lib/publickey.js

@@ -131,7 +131,7 @@ PublicKey._isBuffer = function(param) {
  * @private
  */
 PublicKey._isJSON = function(json) {
-  return JSUtil.isValidJSON(json) || (json.x && json.y);
+  return !!(JSUtil.isValidJSON(json) || (json.x && json.y));
 };
 
 /**

test/publickey.js

@@ -147,6 +147,8 @@ describe('PublicKey', function() {
       expect(function() {
         return PublicKey.fromJSON('{"x": "1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a"}');
       }).to.throw();
+      // coverage
+      PublicKey._isJSON({x: '1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a'}).should.equal(false);
     });
 
     it('fails if invalid JSON is provided', function() {