Also referred to as "fence-posting." The fifth fence-post (id 4) exists, but the fifth element does not. Slicing is a fence-post operation, indexing is an element operation.

The unfortunate implication of mock-based unit testing is that any test written with this approach is inherently implementation-aware. By mocking a specific dependency, your test becomes reliant on how the code under test consumes that dependency, which is not regulated by the public interface.

Anchors and height of a Page are automatically determined to align with the header of the MainView, but can be overridden. Page contents does not automatically leave space for the Page header, so this must be taken into account when anchoring the contents of the Page.

Lastly, remember it’s the people who use our websites and apps that we build for. Not acceptance from our peer group and certainly not our own selfish needs.