...If you need to run IPFS in a Docker container, you can still have Web UI available by exposing both the Gateway and Web UI ports. The end-to-end tests (E2E) test the full app in a headless Chromium browser. They spawn real IPFS node for HTTP API and a static HTTP server to serve the app. The purpose of those tests is not being comprehensible, but act as a quick regression and integration suite.
...Support for the project to create a global configuration set the same compiler options for the files. koala is built with node-webkit. node-webkit is an app runtime based on Chromium and node.js. You can write native apps in HTML and Javascript with node-webkit. Listens to files, compiles automatically when file changes occur. Everything runs in the background without the need for user input.