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comp.lang.ruby

capturing the stdout

Navya Amerineni

3/20/2006 5:30:00 AM

Hi all,

I am running a test case and need it capture the output it gives me.

require 'stringio'
old_stdout = $stdout
$stdout = StringIO.new
............
@reqout = $stdout.string
$stdout = old_stdout


the above code captures the stdout if something written explicily (like puts).
but it doesnot capture the output or running a testcase.
i want to capture the results if the testcases.
is there a way it could be done.

Thanks,
Navya.


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2 Answers

Robert Klemme

3/20/2006 10:38:00 AM

0

Navya Amerineni wrote:
> Hi all,
>
> I am running a test case and need it capture the output it gives me.
>
> require 'stringio'
> old_stdout = $stdout
> $stdout = StringIO.new
> ...........
> @reqout = $stdout.string
> $stdout = old_stdout
>
>
> the above code captures the stdout if something written explicily (like puts).
> but it doesnot capture the output or running a testcase.
> i want to capture the results if the testcases.
> is there a way it could be done.

You probably must redirect $defout also. Other than that doing it
externally (i.e. in the calling process) might be an option, too.

Kind regards

robert

Mauricio Fernández

3/20/2006 12:12:00 PM

0

On Mon, Mar 20, 2006 at 07:39:02PM +0900, Robert Klemme wrote:
> >I am running a test case and need it capture the output it gives me.
> >
> >require 'stringio'
> >old_stdout = $stdout
> >$stdout = StringIO.new
> >...........
> >@reqout = $stdout.string
> >$stdout = old_stdout
> >
> >
> >the above code captures the stdout if something written explicily (like
> >puts).
> >but it doesnot capture the output or running a testcase.
> >i want to capture the results if the testcases.
> >is there a way it could be done.
>
> You probably must redirect $defout also. Other than that doing it
> externally (i.e. in the calling process) might be an option, too.

IIRC $defout is deprecated.

You can separate the output (from the code being tested) from the information
displayed by Test::Unit as follows:

include Test::Unit::UI
out = StringIO.new ""
test_out = StringIO.new ""

$stdout = out
ret = Console::TestRunner.new(my_test_suite, NORMAL, test_out).start
$stdout = STDOUT
# "actual" stdout in out.string
# Test::Unit info in test_out.string


If you also want to capture the stdout from subprocesses, you need something
like
begin
old_stdout = STDOUT.dup
STDOUT.reopen("mytempfile", "w")
...
# create the TestRunner, possibly redirecting its output as shown above;
# fork, system, ``, etc. in the tested code will be redirected to the
# tempfile
...
ensure
STDOUT.reopen(old_stdout)
end


Silly example of the former:


RUBY_VERSION # => "1.8.4"
require 'stringio'
require 'test/unit/ui/console/testrunner'

class Foo
def foo(a,b)
if b > 3
puts a + b
else
puts a - b
end

a * b
end
end

class TC_Foo < Test::Unit::TestCase
def setup; @foo = Foo.new end

def test_foo
assert_equal(8, @foo.foo(2, 4))
end
end

include Test::Unit::UI
out = StringIO.new ""
test_out = StringIO.new ""

$stdout = out
ret = Console::TestRunner.new(TC_Foo.suite, NORMAL, test_out).start
$stdout = STDOUT

puts "Output:"
out.string.each{|x| puts "-> #{x}"}
puts "----"
puts "Test (#{ret.passed? ? "passed" : "failed"}):"
test_out.string.each{|x| puts "->> #{x}"}
# >> Output:
# >> -> 6
# >> ----
# >> Test (passed):
# >> ->> Loaded suite TC_Foo
# >> ->> Started
# >> ->> .
# >> ->> Finished in 0.000601 seconds.
# >> ->>
# >> ->> 1 tests, 1 assertions, 0 failures, 0 errors

--
Mauricio Fernandez - http://eige... - singular Ruby