如何创建带有测试消息的新 ActiveModel::Error？

Question

我正在尝试测试使用 forms 的代码的save功能。 以下是我的代码：

controller.rb

def create
  @project = Project.new(params.require(:project).permit(:name, :description, :team_id, :hackathon_id))

  if @project.save
    flash[:success] = I18n.t('controllers.hackathons.hackathon_registered')
    redirect_to projects_path
  else
    @errors = form_errors(
      @project.errors,
      %i[name description team_id]
    )
    byebug
    render :new, status: :unprocessable_entity
  end
end

rspec文件

subject { post :create, params: params }
let(:params) do
  {
    hackathon_id: mock_hackathon.id,
    project: {
      name: 'Hackathon101',
      team_id: mock_team.id,
      hackathon_id: mock_hackathon.id,
      description: 'This is a description'
    }
  }
end

context 'when unsuccessful save' do
  let(:save_value) { false }

  before do
    allow(project).to receive(:errors).and_return(ActiveModel::Errors.new(name: 'name not valid'))
    subject
  end

  it { expect(assigns(:errors)).not_to be_nil }
  it { is_expected.to render_template('signup_teams/new') }
  it { is_expected.to have_http_status(:unprocessable_entity) }
end

现在，当我无法使用错误消息创建新的ActiveModel::Error来检查值时，此处创建的错误始终具有空值。

任何建议都会很棒..!!