Rspec测试错误-未定义的方法创建

Question

我试图改进我的Rspec测试，并编写更多的测试，在本例中，我可以创建一个很好的映像，并且测试通过了，但是删除该图像有一个问题。

这是我目前为止的测试

describe TimeTable do
  before(:each) do

  Paperclip::Attachment.any_instance.stub(
    :post_process
  ).and_return(true)
  Paperclip::Attachment.any_instance.stub(
    :save
  ).and_return(true)
  # This was a little harder - had to check the stack trace for errors.
  Paperclip::Attachment.any_instance.stub(
    :queue_all_for_delete
  ).and_return([])
end

it 'should save a image for TimeTable' do
  image = Rack::Test::UploadedFile.new(
    'spec/fixtures/rails.png', 'image/png'
  )
  @timetable = TimeTable.new(
    photo: image
  )
  @timetable.save.should eq(true)
  @timetable.photo_file_name.should eq('rails.png')
end

it 'should delete an image for TimeTable' do
  image = Rack::Test::UploadedFile.new(
    'spec/fixtures/rails.png', 'image/png'
  )
  @timetable.create!(
    photo: image
  )
  expect { @timetable.destroy }.to change { TimeTable.count }.by(-1)
end
end

我遇到的错误/失败是

TimeTable should delete an image for TimeTable
 Failure/Error: @timetable.create!(
 NoMethodError:
   undefined method `create!' for nil:NilClass
 # ./spec/models/timetable_spec.rb:33:in `block (2 levels) in <top (required)>'

如何处理此测试以删除图像

感谢你的任何帮助

Answer 1

替换

@timetable.create!(
    photo: image
  )

使用

@timetable= TimeTable.create!(
    photo: image
  )

create!是一个类方法而不是实例方法。您将在TimeTable实例上调用它。因此，错误。