function decorateFn (fn) {
  fn.returns = function (value) {
    fn._returns = value
    return fn
  }
  return fn
}
function decorateFn (fn) {
  fn.returns = function (value) {
    fn._returns = value
    return fn
  }
  return fn
}
function decorateFn ( fn ) { fn . returns = function ( value ) { fn . _returns = value return fn } return fn }
Decorate a mock function with chainable methods.
Decorate a mock function with chainable methods .