Here's an example of mocking any subroutine in any module at any level of depth (using my Mock::Sub distribution).
Order of operation:
script.pl <- A.pm <- B.pm <- REST::Client
So A.pm is our module we're testing with script.pl, B.pm can be someone else module used by our A.pm, and REST::Client is being used by the B.pm module which we have no control over.
A.pm
package A;
use lib '.';
use B;
sub new {
return bless {}, shift;
}
sub call_b {
my ($self) = @_;
my $b = B->new;
return $b->call_rest_client;
}
1;
B.pm:
package B;
use REST::Client;
sub new {
return bless {}, shift;
}
sub call_rest_client {
my ($self) = @_;
my $client = REST::Client->new;
$client->GET('adfdsaf');
return $client->responseContent;
}
1;
script.pl:
use warnings;
use strict;
use feature 'say';
use lib '.';
use A;
use Mock::Sub;
my $obj = A->new;
say "Before mocking REST::Client->responseContent:\n";
say $obj->call_b;
# Mock the sub, and set a custom return value
my $response_client_sub = Mock::Sub->new->mock('REST::Client::response
+Content');
$response_client_sub->return_value('{"a": 1, "b": 2}');
say "After mocking REST::Client->responseContent:\n";
say $obj->call_b;
Output:
Before mocking REST::Client->responseContent:
Can't connect to adfdsaf:80 (Name or service not known)
Name or service not known at /home/spek/perl5/perlbrew/perls/perl-5.26
+.1/lib/site_perl/5.26.1/LWP/Protocol/http.pm line 50.
After mocking REST::Client->responseContent:
{"a": 1, "b": 2}
See the documentation for Mock::Sub for full details and usages.
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