ruby on rails - How to test log content with RSpec? -


for example, generated log(my_work.log) content as:

i, [2015-05-14t00:00:00.000000 #5590]  info -- : work started.

i want test if my_work.log has content work started., how do?

i don't want match line include datetime, because contains #5590, can't stub it.

you can pass in instance of stringio when initializing logger capture output , match on expected content:

require 'logger'  describe "log"   let(:log) { stringio.new }   let(:logger) { logger.new(log) }   let(:expected) { "work started" }    "should add expected content log"     logger.info(expected)     log.rewind     expect(log.read).to match(/.+#{expected}$/)   end  end

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