使用 RSpec 测试以下代码的最佳方法是什么?我应该测试什么?show 动作打开一个文件并将其流式传输。另外,如果该操作依赖于某处存在的文件,我可以对其进行测试吗?
def show
image_option = params[:image_option]
respond_to do |format|
format.js
format.pdf {open_bmap_file("#{@bmap.bmap_pdf_file}", 'application/pdf', "#{@bmap.bmap_name}.pdf", "pdf", "pdf")}
format.png {open_bmap_file("#{@bmap.bmap_png_file}", 'image/png', "#{@bmap.bmap_name}.png", "png", image_option)}
end
end
private
def open_bmap_file(filename, application_type, send_filename, format, image_option = nil)
filename = "app/assets/images/image_not_available_small.png" unless File.exist? filename
path = Bmap.bmaps_pngs_path
case image_option
when "image"
filename = "#{@bmap.bmap_name}.png"
when "large_thumbnail"
filename = "#{@bmap.bmap_name}_large_thumb.png"
when "thumbnail"
filename = "#{@bmap.bmap_name}_thumb.png"
when "pdf"
filename = "#{@bmap.bmap_name}.pdf"
path = Bmap.bmaps_pdfs_path
else
filename = "#{@bmap.bmap_name}.pdf"
path = Bmap.bmaps_pdfs_path
end
begin
File.open(path + filename, 'rb') do |f|
send_data f.read, :disposition => image_option == "pdf" ? 'attachment' : 'inline', :type => application_type, :filename => send_filename
end
rescue
flash[:error] = 'File not found.'
redirect_to root_url
end