Perl module: Test::Mock::Time - Deterministic time & timers for event loop tests
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README.md

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NAME

Test::Mock::Time - Deterministic time & timers for event loop tests

VERSION

This document describes Test::Mock::Time version v0.1.7

SYNOPSIS

use Test::Mock::Time;

# All these functions will return same constant time
# until you manually move time forward by some deterministic
# value by sleep(), ff() or doing one tick of your event loop.
say time();
say localtime();
say gmtime();
say Time::HiRes::time();
say Time::HiRes::gettimeofday();
say Time::HiRes::clock_gettime(CLOCK_REALTIME());
say Time::HiRes::clock_gettime(CLOCK_MONOTONIC());

# All these functions will fast-forward time (so time() etc.
# will return increased value on next call) and return immediately.
# Pending timers of your event loop (if any) will not be processed.
sleep(1);
Time::HiRes::sleep(0.5);
Time::HiRes::usleep(500_000);
Time::HiRes::nanosleep(500_000_000);
Time::HiRes::clock_nanosleep(500_000_000);

# This will fast-forward time and process pending timers (if any).
ff(0.5);

# These will call ff() in case no other (usually I/O) event happens in
# $Test::Mock::Time::WAIT_ONE_TICK seconds of real time and there are
# some active timers.
Mojo::IOLoop->one_tick;
EV::run(EV::RUN_ONCE);

DESCRIPTION

This module replaces actual time with simulated time everywhere (core time(), Time::HiRes, EV, AnyEvent with EV, Mojolicious, …) and provide a way to write deterministic tests for event loop based applications with timers.

IMPORTANT! This module must be loaded by your script/app/test before other related modules (Time::HiRes, Mojolicious, EV, etc.).

EXPORTS

These functions are exported by default:

ff

INTERFACE

WAIT_ONE_TICK

$Test::Mock::Time::WAIT_ONE_TICK = 0.05;

This value is used to limit amount of real time spend waiting for non-timer (usually I/O) event while one tick of event loop if there are some active timers. In case no events happens while this time event loop will be interrupted and time will be fast-forward to time when next timer should expire by calling ff().

ff

ff( $seconds );
ff();

Fast-forward current time by $seconds (can be fractional). All functions like time() will returns previous value increased by $seconds after that.

Will run callbacks for pending timers of your event loop if they'll expire while $seconds or if they've already expired (because you've used functions like sleep() which fast-forward time without processing timers).

When called without params will fast-forward time by amount needed to run callback for next pending timer (it may be 0 in case there are no pending timers or if next pending timer already expired).

Mocked functions/methods from other modules

See "SYNOPSIS" for explanation how they works.

  • CORE::GLOBAL

    • time
    • localtime
    • gmtime
    • sleep
  • Time::HiRes

    • time
    • gettimeofday
    • clock_gettime
    • clock_getres
    • sleep
    • usleep
    • nanosleep
    • clock_nanosleep
  • Mojo::Reactor::Poll

    All required methods.

  • EV

    All required methods except:

      EV::once
      EV::Watcher::feed_event
    

SUPPORT

Bugs / Feature Requests

Please report any bugs or feature requests through the issue tracker at https://github.com/powerman/perl-Test-Mock-Time/issues. You will be notified automatically of any progress on your issue.

Source Code

This is open source software. The code repository is available for public review and contribution under the terms of the license. Feel free to fork the repository and submit pull requests.

https://github.com/powerman/perl-Test-Mock-Time

git clone https://github.com/powerman/perl-Test-Mock-Time.git

Resources

AUTHOR

Alex Efros powerman@cpan.org

COPYRIGHT AND LICENSE

This software is Copyright (c) 2016- by Alex Efros powerman@cpan.org.

This is free software, licensed under:

The MIT (X11) License