Test::Future(3)                User Contributed Perl Documentation                Test::Future(3)



NAME
       "Test::Future" - unit test assertions for Future instances

SYNOPSIS
        use Test::More tests => 2;
        use Test::Future;

        no_pending_futures {
           my $f = some_function();

           is( $f->get, "result", 'Result of the some_function()' );
        } 'some_function() leaves no pending Futures';

DESCRIPTION
       This module provides unit testing assertions that may be useful when testing code based
       on, or using Future instances or subclasses.

FUNCTIONS
   no_pending_futures
          no_pending_futures( \&code, $name )

       Since version 0.29.

       Runs the given block of code, while keeping track of every "Future" instance constructed
       while doing so. After the code has returned, each of these instances are inspected to
       check that they are not still pending. If they are all either ready (by success or
       failure) or cancelled, the test will pass. If any are still pending then the test fails.

       If Devel::MAT is installed, it will be used to write a memory state dump after a failure.
       It will create a .pmat file named the same as the unit test, but with the trailing .t
       suffix replaced with -TEST.pmat where "TEST" is the number of the test that failed (in
       case there was more than one). A list of addresses of "Future" instances that are still
       pending is also printed to assist in debugging the issue.

       It is not an error if the code does not construct any "Future" instances at all. The block
       of code may contain other testing assertions; they will be run before the assertion by
       "no_pending_futures" itself.

AUTHOR
       Paul Evans <leonerd AT leonerd.uk>



perl v5.20.2                                2024-03-08                            Test::Future(3)