Serverspec is a testing framework designed to check that your server has been configured correctly through an SSH connection, and it's part of the Chef DK suite. It tests verify your remote cloud or virtualization server’s actual state through an SSH connection, including resource types such as packages, services, directories, files, and commands. Test Kitchen is a testing harness that executes and verifies your infrastructure code on one or more platforms in isolation, allowing you to run your code on various cloud providers and virtualization technologies. Integration tests for the nginx-pkg cookbook were created using Serverspec, including tests for package installation, service resource type, directory resource type, file resource type, and command resource type. To improve test coverage, additional Serverspec tests were added to check scenarios such as service enablement, package version installation, and file contents. The integration testing process includes setting up a local development environment with Chef DK, VirtualBox, and Vagrant, installing Test Kitchen and Serverspec, and running kitchen test to execute the integration tests.