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rspec 2.14 の構文に問題があります。RSpec コントローラーはうまく機能しますが、別の構文が必要です。

describe Frontend::UsersController, type: :controller do
  describe 'POST "create"' do
    subject { post :create, user: { login: email } }

    context 'with valid attributes' do
      let(:email) { FactoryGirl.attributes_for(:user)[:email] }

      it { expect{ subject }.to change{ User.count }.by(1) }
      it { expect(subject).to redirect_to(root_path) }

変更とリダイレクトのメソッドに異なる構文が必要なのはなぜですか?

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They don't. You could do change(User, :count) instead. The form you're using evaluates the block before and after running that line and checks if the value changed appropriately. In English:

  • The User count is X right now.
  • Call create in the Frontend::UsersController.
  • The User count is Y after that.
  • I expect Y to equal X + 1.

UPDATE

In case you're actually talking about expect{subject} vs. expect(subject): the change expectation needs something to test for change against. Since you're passing expect a block, change knows it can first check the User count, evaluate the block (call subject), then check the User count again. If you didn't pass a block, it's ambiguous for when you'd actually want to start checking for changes in the User count.

于 2013-11-05T05:24:39.443 に答える