oracular (3) Test::Mock::Cmd.3pm.gz
NAME
Test::Mock::Cmd - Mock system(), exec(), and qx() for testing
VERSION
This document describes Test::Mock::Cmd version 0.7
SYNOPSIS
use Test::Mock::Cmd 'system' => \&my_cmd_mocker, 'qx' => \&my_cmd_mocker;
or
use Test::Mock::Cmd \&my_cmd_mocker;
or
use Test::Mock::Cmd \&my_mock_system, \&my_mock_exec, \&my_mock_qx;
or
use Test::Mock::Cmd 'system' => { X }, 'qx' => { X }; # can mix and match hash ref and code ref
or
use Test::Mock::Cmd { X };
or
use Test::Mock::Cmd { X }, { X }, { X }; # can mix and match hash ref and code ref
Typical testing usage example:
use Test::More;
our $current_system = sub { diag( explain( \@_ ) ); return 0; };
use Test::Mock::Cmd 'system' => sub { $current_system->(@_) };
use Foo;
X
{
my $sys;
local $current_system = sub { $sys = \@_ };
foo(1);
is($sys, undef, 'foo() does not call system w/ true arg');
$sys = undef; # just in case
foo();
isnt($sys, undef, 'foo() calls system by default');
is_deeply($sys, [qw(/bin/chibby -wibby foo)], 'foo() calls system with expected args);
}
{
local $current_system = sub { return 0 };
ok foo(), 'foo() returns true when system() works';
}
{
local $current_system = sub { return 1 };
ok !foo(), 'foo() returns false when system() fails';
}
X
done_testing;
DESCRIPTION
Mock system(), exec(), qx() (AKA `` and readpipe()) with your own functions in order to test code that
may call them.
Some uses might be:
1. avoid actually running the system command, just pretend we did (simulate [un]expected output, return
values, etc)
2. test various return value handling (e.g. the system command core dumps how does the object handle
that)
3. test that the arguments that will be passed to a system command are correct
4. simulate that really hard to reproduce low level edge case to make sure your code works correctly on
affected systems
5. etc etc
INTERFACE
Commence mocking
Per the synopsis, you can provide import() with a hash whose keys are 'system', 'exec', or 'qx' and whose
values are the code reference you want to replace the key's functionality with, 1 code reference to
replace all 3 functions or 3 code references to replace system(), exec(), and qx() (in that order).
As of v0.6 you can pass in a hash instead of a coderef that will generate a handler that defaults to the
original call if the first argument given is not a key in said hash.
use Test::Mock::Cmd 'system' => {
'git' => sub { X },
};
system('git', X); # calls your function
system('whatever', X); # calls the original system
Caveat
Any code loaded before the mock functions are setup will retain normal system(), etc behavior. (even if
the system() does not happen until much later!)
use X; # has functions that call system()
use Test::Mock::Cmd ...
use Y; # has functions that call system()
X::i_call_system(...); # normal system() happens
Y::i_call_system(...); # mocked system() happens
Getting access to the original, un-mocked, functionality.
None of these are exportable.
Test::Mock::Cmd::orig_system()
Original, not-mocked "system_LIST" in perlfunc
Test::Mock::Cmd::orig_exec()
Original, not-mocked "exec" in perlfunc
Test::Mock::Cmd::orig_qx()
Original, not-mocked "readpipe" in perlfunc
DIAGNOSTICS
"Not a CODE or HASH reference"
The given value is not a code reference or a hash reference and should be one or the other.
"Key is not system, exec, or qx"
A key in your argument hash is invalid.
"Test::Mock::Cmd->import() requires a 1-3 key hash, 1 code/hash reference, or 3 code/hash references as
arguments"
You are not passing in the required one or three arguments.
CONFIGURATION AND ENVIRONMENT
Test::Mock::Cmd requires no configuration files or environment variables.
DEPENDENCIES
None.
INCOMPATIBILITIES
None reported.
BUGS AND FEATURES
Please report any bugs or feature requests (and a pull request for bonus points)
through the issue tracker at <https://github.com/drmuey/p5-Test-Mock-Cmd/issues>.
See Also
Test::MockCommand for a more complex (and much heavier) object based approach to this.
AUTHOR
Daniel Muey "<http://drmuey.com/cpan_contact.pl>"
LICENCE AND COPYRIGHT
Copyright (c) 2011 cPanel, Inc. "<copyright@cpanel.net>>". All rights reserved. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.1 or, at your option, any later version of Perl 5 you may have available.
DISCLAIMER OF WARRANTY
BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT
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PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
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