如何通過在rspec中引起挽救語句來測試向錯誤日志添加行

Question

我有這個Foo班。

class Foo
  def open_url
    Net::HTTP.start("google.com") do |http|
      # Do Something
    end
  rescue Exception => e
    File.open("error.txt","a+"){|f| f.puts e.message }
  end
end

我想通過此Rspec進行測試。

require_relative 'foo'

describe Foo do
  describe "#open_url" do
    it "should put error log if connection fails" do
      Net::HTTP.stub(:start).and_return(Exception)
      # Check if a line to error.txt is added.
    end
  end
end

如何檢查是否在error.txt插入了error.txt ？

Answer 1

您可以閱讀您實際上正在寫入的文件

describe Foo do
  describe "#open_url" do
    it "should put error log if connection fails" do
      Net::HTTP.stub(:start).and_raise
      Foo.open_url
      file = File.open("error.txt", "r")
      # ...
    end
  end
end

另一種方法是檢查文件是否已打開：

File.should_receive(:open).with("error.txt", "a+", {|f| f.puts e.message })