Question

I am using the module Sub::Override to mock a subroutine during testing. I am actually testing a subroutine named sub_a. sub_a is calling another subroutine sub_b to do some work. sub_b is actually executing some commands over the ssh connection which I want to mock in my testing mode. So I am using sub::override to mock sub_b.

sub_a{
 ...
 sub_b(arg1, arg2)
}

In my test code I am overriding it like this

my $override_sshCommand = override_sub( 'package::filename::sub_b', sub ($$) { return "success"; }, undef );

In the above code if sub_b and sub_a are in the same class then the override is successful. Otherwise the override does not work.
I can fix this issue by using the fully qualified name of sub_b when calling from sub_a

sub_a{
 ...
 package::filename::sub_b(arg1, arg2);
}

The above code fixes the issue and the override is successful. But I don’t want to do it like this, as I don’t own that code and also it looks ugly. Is there any other solution ?

Answer 1

I presume sub_b is imported by the package that contains sub_a?

You’re changing the sub to which the name package_of_sub_b::sub_b refers.

You’re not changing the sub to which the name package_of_sub_a::sub_b refers.

If the second name you’re resolving, so you need to override the sub_b in the package that contains sub_a.

override_sub( 'package_of_sub_a::sub_b', ... );