Right now, these method names are a little inconsistent. Some reflect specific implementation details around the DOM interaction they simulate (i.e. `clickThumbnail`), while others are abstract names that just describe the user intent (i.e. `enterSelectionMode`). We should use the same naming convention for all the "test application" methods, and I recommend going with the latter.

For example:

`selectThumbnail` is preferable to `clickThumbnail` since the "click" part is more of an implementation detail (if it were changed to "tap" or "hover", the tests themselves shouldn't have to change--just the body of this function).