Write Ruby Test::Unit Errors & Fails to File - ruby

Question

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.

Answer 1

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

Answer 2

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...

Answer 3

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)