How do i snapshot test a scroll view?

[bitwit]

I'm trying to write some snapshot tests around a UITableView and was attempting to scroll to snapshot the bottom of the table but no matter what I do the snapshot appears to ignore scoll position.

Originally i was snapshotting a view controller, but then tried snapshotting the tableview directly and got a fatal error warning me View not renderable to image at size ...

Am I taking the wrong approach to this or is there some way to snapshot a scrollable view to capture all its contents?

Thanks for the help. This library is a thing of beauty and I'm excited to finally be playing with it at work.

[bitwit]

I think I have a solution so i will close this issue.

In case anyone else has the problem, I found that rendering to a custom image size configuration allowed me to get everything in a single image:

assertSnapshot(matching: vc, as: .image(on: .init(safeArea: .zero, size: .init(width: 480, height: 2000), traits: .init())))

[stephencelis]

Hi @bitwit! Yeah that's the solution we typically go with. Not quite sure where it might fit to document for others, but if you have any ideas please let us know!

[UrsKahmann]

Hey @stephencelis and @bitwit , did you guys by any chance find a way to take a screenshot of scroll view, which is only as large as the content? The approach that @bitwit used (with setting a fixed size) works, but requires a good guess at how heigh the scroll view will be.

[bitwit]

@UrsKahmann last time I checked there is no way to only capture a page's worth of content at a time. Typically I set the height a reasonable amount higher than I anticipate so there's some wiggle room, but it's not perfect.

[robinsalehjan]

@bitwit Did you manage to get this working on Travis/CircleCI? The difference in width/height between the simulator and the snapshot results in a failure.

[bitwit]

@robinsalehjan yes, this was functional on bitrise CI always. Not sure why you're getting a dimension difference if you set it manually