I usually prefer interpolation because I can see at a glance what the result will look like, so there is less mental work to do when reading it.

sprintf is a good middle ground between interpolation and concatenation. I sometimes use that when the variable names are long enough to interfere with the readability of interpolation. 

my $signed_payload = $sig_head{'t'} . '.' . $self->{'payload'};

my $signed_payload = sprintf '%s.%s', $sig_head{'t'}, $self->{'payload
+'};

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In reply to Re^4: What to test in a new module by Arunbear
in thread What to test in a new module by Bod

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