Way back in #187, I introduced a hacky tool to show the available space on a slide: it was a `mdbook` plugin which injected the necessary CSS on each slide. Crude, but it got the job done. The logic was moved from Python to a real CSS file with associated JavaScript in #1842. In #1917, the functionality was moved to a dedicated “instructor menu”, together with functionality for saving the state of the Playground on each slide. Unfortunately, the whole thing was disabled in #1935 since I found that the Playgrounds lost their code with the saving logic. I was also not 100% happy with dedicating space on each slide for a menu only used by instructors. However, I really think we need a tool to let slide editors know about the available space, so I would like to re-introduce the red box. This time via a keyboard shortcut to make it easy to toggle as needed. I’m suggesting enabling this for everyone, with the expectation that most people won’t find the shortcut and will quickly disable the box if they do (there is a dedicated button to hide it again). End-to-end tests have been added for the new functionality.
Testing Comprehensive Rust
The course material contains JS code that can break and needs to be checked for
functionality. Examples are theme/speaker-notes.js or theme/book.js.
Comprehensive Rust is using webdriverIO and the webdriverIO Expect API in combination with Mocha. WebdriverIO is taking care of accessing the webpage with a real browser and can access the state of the page so behavior can be asserted.
The Static Server Service is
used mainly in the CI to serve the book on
port localhost:8080 such that the test runner can access it. This mode is used
when npm start or npm test is executed.
Tip: Use
cargo xtask web-teststo run the tests in this directory from anywhere in the repository.
For local testing and quick iterations it is possible to use mdbook serve
which creates a small HTTP server on port 3000 by default. There is a special
config that is invoked with npm run test-mdbook that uses
http://localhost:3000