Test Kitchen vs VMware vSphere: What are the differences?

Test Kitchen: Integration tool for developing and testing infrastructure code and software on isolated target platforms. Test Kitchen has a static, declarative configuration in a .kitchen.yml file at the root of your project. It is designed to execute isolated code run in pristine environments ensuring that no prior state exists. A plugin architecture gives you the freedom to run your code on any cloud, virtualization, or bare metal resources and allows you to write acceptance criteria in whatever framework you desire; VMware vSphere: Free bare-metal hypervisor that virtualizes servers so you can consolidate your applications on less hardware. vSphere is the world’s leading server virtualization platform. Run fewer servers and reduce capital and operating costs using VMware vSphere to build a cloud computing infrastructure.

Test Kitchen can be classified as a tool in the "Continuous Integration" category, while VMware vSphere is grouped under "Virtualization Platform".

"Automated testing" is the primary reason why developers consider Test Kitchen over the competitors, whereas "Strong host isolation" was stated as the key factor in picking VMware vSphere.

Test Kitchen is an open source tool with 1.61K GitHub stars and 540 GitHub forks. Here's a link to Test Kitchen's open source repository on GitHub.