Install libplack-test-externalserver-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libplack-test-externalserver-perl
module for running HTTP tests on external live servers
Plack::Test::ExternalServer allows you to run your Plack::Test tests against an external server instead of just against a local application through either mocked HTTP or a locally spawned server. . See Plack::Test on how to write tests that can use this module.