Man pages matching name plack::test::agent in section 3pm:

Plack::Test::Agent.3pm.en	debian 10 / libplack-test-agent-perl
Plack::Test::Agent.3pm.en	debian 11 / libplack-test-agent-perl
Plack::Test::Agent.3pm.en	debian 12 / libplack-test-agent-perl