在ruby grape API中的params中测试自定义验证器的存在

class CustomValidator < Grape::Validations::Validator
  def validate_param!(attr_name, params)
    # 在这里编写自定义验证逻辑
    unless params[attr_name].start_with?('custom')
      raise Grape::Exceptions::Validation, params: [@scope.full_name(attr_name)], message: '参数不符合自定义验证规则'
    end
  end
end

params do
  requires :custom_param, using: CustomValidator
end

describe 'CustomValidator' do
  subject { Class.new(Grape::API) }

  before do
    subject.params do
      requires :custom_param, using: CustomValidator
    end

    subject.get '/test' do
      # 在这里处理API逻辑
    end
  end

  it 'validates custom_param' do
    get '/test', custom_param: 'custom_value'
    expect(last_response.status).to eq(200)
  end

  it 'fails validation for custom_param' do
    get '/test', custom_param: 'invalid_value'
    expect(last_response.status).to eq(400)
    expect(JSON.parse(last_response.body)['error']).to eq('参数不符合自定义验证规则')
  end
end