Make t/ack-man.t and t/invalid-ackrc.t work under Travis

[petdance]

We've had to SKIP tests in two tests under Travis because Travis can't find stty in its path. Solve this problem.

[petdance]

Sample failure:

t/ack-man.t .................. 
    #   Failed test 'Nothing in STDERR'
    #   at t/ack-man.t line 60.
    # [
    #   'stty: standard input: Inappropriate ioctl for device'
    # ]
        #   Failed test 'Found one (?^ms:^AUTHOR$) section'
        #   at t/ack-man.t line 108.
        #          got: '0'
        #     expected: '1'
        # Looks like you failed 1 test of 1.
    #   Failed test 'want( (?^ms:^AUTHOR$) )'
    #   at t/ack-man.t line 62.
    # Looks like you failed 2 tests of 3.

[petdance]

Working on this in the pathing branch.

[petdance]

Reading this thread makes me think it might be something Travis does with STDIN.

https://unix.stackexchange.com/questions/157852/echo-test-stty-echo-stty-standard-input-inappropriate-ioctl-for-device

[petdance]

Travis can't find stty in its path

That's wrong. The problem is that perldoc doesn't run right in whatever environment Travis has set up. So when running under Travis, don't use perldoc.

Fixed in 589cdb7 on dev.

[eserte]

@petdance: I see this problem also on some of my smokers --- currently there are 26 fails vs. 85 passes. I don't see a pattern regarding OS or perl version. It seems to happen more often on Debian-based systems (Debian and Ubuntu), and almost never on Fedora-based systems (just a few fails on CentOS6). The problem does not happen on my FreeBSD systems.

[petdance]

You're saying this still happens with v3.0.0?

[eserte]

I see ack-man.t and invalid-ackrc.t failures also with v3.0.1:

#   Failed test 'Nothing in STDERR'
#   at t/ack-man.t line 22.
# [
#   'stty: Standardeingabe: Unpassender IOCTL (I/O-Control) für das Gerät'
# ]
# Looks like you failed 1 test of 3.
t/ack-man.t .................. 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/3 subtests 
...
    
    #   Failed test 'Should have no output to stderr: ack --env --man'
    #   at t/invalid-ackrc.t line 78.
    #          got: '1'
    #     expected: '0'
    # STDERR:
    # stty: Standardeingabe: Unpassender IOCTL (I/O-Control) für das Gerät
    # Looks like you failed 1 test of 2.

#   Failed test 'Check --env --man'
#   at t/invalid-ackrc.t line 83.
# Looks like you failed 1 test of 3.
t/invalid-ackrc.t ............ 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/3 subtests 

[n1vux]

I see the same on Ubuntu LTS 16.04 with perlbrew perl 5.026.01, except with English error messages
stty: 'standard input': Inappropriate ioctl for device

When we saw this previously, we suspected owncloud/core#29639 might be similar issue.

[choroba]

For me, the tests fail under cpan or make test, but they pass when run manually with prove. System Perl 5.26.1 on openSUSE Leap 15.1.