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Test::MockTime(3) |
User Contributed Perl Documentation |
Test::MockTime(3) |
Test::MockTime - Replaces actual time with simulated time
use Test::MockTime qw( :all );
set_relative_time(-600);
# do some tests depending on time increasing from 600 seconds ago
set_absolute_time(0);
# do some more tests depending on time starting from the epoch
# epoch may vary according to platform. see perlport.
set_fixed_time(CORE::time());
# do some more tests depending on time staying at the current actual time
set_absolute_time('1970-01-01T00:00:00Z');
# do some tests depending on time starting at Unix epoch time
set_fixed_time('01/01/1970 00:00:00', '%m/%d/%Y %H:%M:%S');
# do some tests depending on time staying at the Unix epoch time
restore_time();
# resume normal service
This module was created to enable test suites to test code at specific points in
time. Specifically it overrides localtime, gmtime and time at compile time and
then relies on the user supplying a mock time via set_relative_time,
set_absolute_time or set_fixed_time to alter future calls to gmtime,time or
localtime.
- set_absolute_time
- If given a single, numeric argument, the argument is an absolute time (for
example, if 0 is supplied, the absolute time will be the epoch), and
calculates the offset to allow subsequent calls to time, gmtime and
localtime to reflect this.
for example, in the following code
Test::MockTime::set_absolute_time(0);
my ($start) = time;
sleep 2;
my ($end) = time;
The $end variable should contain 2
seconds past the epoch;
If given two arguments, the first argument is taken to be an
absolute time in some string format (for example, "01/01/1970
00:00:00"). The second argument is taken to be a
"strptime" format string (for example,
"%m/%d/%Y %H:%M:%S"). If a single
argument is given, but that argument is not numeric, a
"strptime" format string of
"%Y-%m-%dT%H:%M:%SZ" is assumed.
for example, in the following code
Test::MockTime::set_absolute_time('1970-01-01T00:00:00Z');
my ($start) = time;
sleep 2;
my ($end) = time;
The $end variable should contain 2
seconds past the Unix epoch;
- set_relative_time($relative)
- takes as an argument an relative value from current time (for example, if
-10 is supplied, current time be converted to actual machine time - 10
seconds) and calculates the offset to allow subsequent calls to
time,gmtime and localtime to reflect this.
for example, in the following code
my ($start) = time;
Test::MockTime::set_relative_time(-600);
sleep 600;
my ($end) = time;
The $end variable should contain
either the same or very similar values to the
$start variable.
- set_fixed_time
- If given a single, numeric argument, the argument is an absolute time (for
example, if 0 is supplied, the absolute time will be the epoch). All
subsequent calls to gmtime, localtime and time will return this value.
for example, in the following code
Test::MockTime::set_fixed_time(time)
my ($start) = time;
sleep 3;
my ($end) = time;
the $end variable and the
$start variable will contain the same
results
If given two arguments, the first argument is taken to be an
absolute time in some string format (for example, "01/01/1970
00:00:00"). The second argument is taken to be a
"strptime" format string (for example,
"%m/%d/%Y %H:%M:%S"). If a single
argument is given, but that argument is not numeric, a
"strptime" format string of
"%Y-%m-%dT%H:%M:%SZ" is assumed.
- restore()
- restore the default time handling values.
"restore_time" is an alias. When
exported with the 'all' tag, this subroutine is exported as
"restore_time".
Test::MockTime requires no configuration files or environment variables.
Test::MockTime depends on the following non-core Perl modules.
- •
- Time::Piece 1.08 or greater
David Dick <ddick@cpan.org>
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
Thanks to a use.perl.org journal entry
<http://use.perl.org/~geoff/journal/20660> by Geoffrey Young.
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