Test2::Require::Fork#

Skip a test file unless the system supports forking

DESCRIPTION#

It is fairly common to write tests that need to fork. Not all systems support forking. This library does the hard work of checking if forking is supported on the current system. If forking is not supported then this will skip all tests and exit true.

SYNOPSIS#

use Test2::Require::Fork;

... Code that forks ...

EXPLANATION#

Checking if the current system supports forking is not simple. Here is an example of how to do it:

use Config;

sub CAN_FORK {
    return 1 if $Config{d_fork};

    # Some platforms use ithreads to mimic forking
    return 0 unless $^O eq 'MSWin32' || $^O eq 'NetWare';
    return 0 unless $Config{useithreads};
    return 0 unless $Config{ccflags} =~ /-DPERL_IMPLICIT_SYS/;

    # Threads are not reliable before 5.008001
    return 0 unless $] >= 5.008001;

    # Devel::Cover currently breaks with threads
    return 0 if $INC{'Devel/Cover.pm'};
    return 1;
}

Duplicating this non-trivial code in all tests that need to fork is error-prone. It is easy to forget bits, or get it wrong. On top of these checks, you also need to tell the harness that no tests should run and why.

SEE ALSO#

SOURCE#

The source code repository for Test2-Suite can be found at https://github.com/Test-More/test-more/.

MAINTAINERS#

AUTHORS#