Rspec未定义的方法'to'

Question

所以我有一个未定义的方法错误，它适用于 Rspec 方法“to”。我有以下代码的规范

  it "sends an email to users who have favorited the post" do
    @user.favorites.where(post: @post).create

    allow ( FavoriteMailer )
      .to receive(:new_comment)
      .with(@user, @post, @comment)
      .and_return( double(deliver: true))

当我运行规范时，我收到以下错误：

1) Comment after_create with users permission sends an email to users who have favorited the post
 Failure/Error: allow ( FavoriteMailer )
 NoMethodError:
   undefined method `to' for FavoriteMailer:Class
 # ./spec/models/comment_spec.rb:18:in `block (4 levels) in <top (required)>'

任何想法为什么会发生这种情况？

Answer 1

只需删除第一个括号之前的空格，这样你就可以写：

 allow( FavoriteMailer )

但看起来更好：

 allow(FavoriteMailer)

在您的情况下：allow (FavoriteMailer).to .. 被解释为：allow((FavoriteMailer).to ..)