CODEWITHSUNDEEP
rubyunit-testingstdoutstderrtestunit
Doug M.
Doug M.

Reputation: 13

Write Ruby Test::Unit Errors & Fails to File

I am trying to write fails and errors that occur in the test to a log file, so that they don't appear on-screen, but it appears as though errors and assert failures write to STDOUT instead of STDERR. I have been unable to find information on how to redirect this output after hours of googling, and would greatly appreciate help.

Upvotes: 1

Views: 1425

Answers (3)

knut
knut

Reputation: 27875

Why should the errors not be on stdout? Up to now I have no prepared solution to suppress the output for specific errors.

If you accept the unchanged output, I have a solution to store errors and failures in a file. It will be no problem to create a 2nd file for Notifications...

gem 'test-unit'
require 'test/unit'

module Test
  module Unit
    class TestSuite
      alias :old_run :run
      def run(result, &progress_block)
        old_run(result, &progress_block)
        File.open('test.log', 'w'){|f|
          result.faults.each{|err|
            case err
              when Test::Unit::Error, Test::Unit::Failure
                f << err.long_display
                f << "\n===========\n"
              #not in log file
              when Test::Unit::Pending, Test::Unit::Notification, Test::Unit::Omission
              end
          }
        }
      end
    end
  end
end


class MyTest < Test::Unit::TestCase

  def test_1()
    assert_equal( 3, 1+1) #failure
  end
  def test_2()
    1 / 0 #force an error
  end
  def test_3()
    notify 'sss'
  end
  def test_4()
    pend "MeineKlasse.new"
  end
  def test_5
    omit 'aaa' if RUBY_VERSION == '1.9.2'
  end

  def test_5
    assert_in_delta( 0.1, 0.00001, 1.0/10)
  end

end

Upvotes: 1

knut
knut

Reputation: 27875

I hope I understood yor question correct.

Do you mean something like this:

gem 'test-unit'
require 'test/unit'

class StdOutLogger < IO
  def initialize(*)
    super
    @file = File.open('log.txt', 'w')
    @stdout = true
  end 
  #write to stdout and file
  def write(s)
    $stdout << s
    @file << s
  end
end
STDOUT = StdOutLogger.new(1)

class MyTest < Test::Unit::TestCase      
  def test_1()
    assert_equal( 2, 1+1)
    assert_equal( 2, 4/2)

    assert_equal( 1, 3/2)
    assert_equal( 1.5, 3/2.0)
  end
end

But I would recommend to copy stdout on operation system level

ruby mytest.rb > log.txt

Here is a version to skip between stdout and file output. The output switch is only a interim solution - perhaps it can be made better.

class StdOutLogger < IO
  def initialize(*)
    super
    @file = File.open('log.txt', 'w')
    @stdout = true
  end 
  def write(s)
    case s
      when /\AError:/
        @stdout = false #change to file
      when /\A(Pending):/
        @stdout = true #change to file
    end

    if @stdout
    $stdout << s
    else
    @file << s
    end
  end
end
STDOUT = StdOutLogger.new(1)

Upvotes: 0

origami addict
origami addict

Reputation: 108

Have you tried redirecting the output to StringIO, to write it to a logfile later?

original_stdout = $stdout
original_stderr = $stderr
fake_stdout = StringIO.new
fake_stderr = StringIO.new

$stdout = fake_stdout
$stderr = fake_stderr

Then after you've ran the tests:

$stdout = original_stdout
$stderr = original_stderr

@stdout = fake_stdout.string
@stderr = fake_stderr.string

I'm not really sure this will work though...

Upvotes: 1

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