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Top Forums Shell Programming and Scripting Perl open(CMD, "cmd |"); buffering problem.. Post 302593563 by thegeek on Friday 27th of January 2012 10:01:18 AM
Old 01-27-2012
Are you sure the 3rd party application writes everything to STDOUT ? Bcoz, you are likely to miss the stuffs printed on STDERR ... But when you execute manually and see output you are likely to miss where it prints .. So try doing with redirection of error to different place & confirm !
 

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App::Cmd::Tester::CaptureExternal(3pm)			User Contributed Perl Documentation		    App::Cmd::Tester::CaptureExternal(3pm)

NAME
App::Cmd::Tester::CaptureExternal - Extends App::Cmd::Tester to capture from external subprograms VERSION
version 0.318 SYNOPSIS
use Test::More tests => 4; use App::Cmd::Tester::CaptureExternal; use YourApp; my $result = test_app(YourApp => [ qw(command --opt value) ]); like($result->stdout, qr/expected output/, 'printed what we expected'); is($result->stderr, '', 'nothing sent to sderr'); ok($result->output, "STDOUT concatenated with STDERR"); DESCRIPTION
App::Cmd::Tester provides a useful scaffold for testing applications, but it is unable to capture output generated from any external subprograms that are invoked from the application. This subclass uses an alternate mechanism for capturing output (Capture::Tiny) that does capture from external programs, with one major limitation. It is not possible to capture externally from both STDOUT and STDERR while also having appropriately interleaved combined output. Therefore, the "output" from this subclass simply concatenates the two. You can still use "output" for testing if there is any output at all or for testing if something appeared in either output stream, but you can't rely on the ordering being correct between lines to STDOUT and lines to STDERR. AUTHOR
Ricardo Signes <rjbs@cpan.org> COPYRIGHT AND LICENSE
This software is copyright (c) 2012 by Ricardo Signes. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. perl v5.14.2 2012-05-05 App::Cmd::Tester::CaptureExternal(3pm)
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