ruby: unable to use logger with rspec

Question

I am trying to add logging to a simple rspec test. I am using Watir to drive Chrome within the spec and this works fine. I am unable to get logs using the "Logger" library.

This is my spec:

require 'rubygems'
require 'watir-webdriver'
require 'rspec'
require 'logger'

describe 'ui tests' do
  let(:browser) { browser ||= Watir::Browser.new :chrome }

  let(:log) {
    log = Logger.new(STDOUT)
    log = Logger.new('watir.tests.log', 'daily')
    log.level = Logger::DEBUG
  }

  before {
    browser.goto 'http://translate.google.com'
  }
  after { browser.close }

  context 'simple tests' do
    it 'simple test' do
      log.info("Running simple test")
      browser.text_field(:id => "source").set("ost")

      # actual test/asserts here

    end
  end
end

The problem is that I am unable to call any logging method such as log.info inside the example. I get this error:

Failures:

  1) ui tests simple tests simple test
Failure/Error: log.info("Running simple test")
NoMethodError:
  undefined method `info' for 0:Fixnum

Why is this failing? Is it a scope issue? If I comment out the log.info the spec runs fine. I can use any methods on the "browser" object (for example, the call to browser.text_field) inside the example without a problem.

Where I am going wrong?

Your let(:log) block does not return the Logger instance. Simply append a line with log before the closing } — Arnaud Meuret
– Arnaud Meuret, Commented Aug 9, 2016 at 16:24

Amit Kumar Gupta · Accepted Answer · 2013-04-26 08:46:36Z

6

The value of log is the last thing evaluated inside the let(:log) { } block, which is Logger::DEBUG. This constant just corresponds to the Fixnum 0, and there's no method called info for 0. Try this instead:

let(:log) { 
  Logger.new(STDOUT).tap { |l| l.level = Logger::DEBUG }
}

By the way, what are you trying to do with setting log = Logger.new(STDOUT) and then immediately reassigning log = Logger.new('watir.tests.log', 'daily')?

answered Apr 26, 2013 at 8:46

Amit Kumar Gupta

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6 Comments

nonbeing Over a year ago

I'm trying to get logging on both STDOUT and also to a file. I guess this isn't the right way to do this? I'm coming from log4j where you have appenders, and am (quite obviously) new to ruby.

Amit Kumar Gupta Over a year ago

See if this helps: stackoverflow.com/questions/6407141/…

nonbeing Over a year ago

Your solution works, but I can't understand the functional programming magic. Can you post a link to an explanation of what the feature is and how it works?

Amit Kumar Gupta Over a year ago

let(:foo) { do_stuff } is essentially equivalent to def foo; @foo ||= do_stuf; end. foo.tap { |bar| do_stuff } is a little harder, but it's often the same as bar = foo; do_stuff; foo;.

Amit Kumar Gupta Over a year ago

let: relishapp.com/rspec/rspec-core/v/2-6/docs/helper-methods/… tap: ruby-doc.org/core-2.0/Object.html#method-i-tap

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