SnapViewer

📷 SnapViewer for testthat snapshots

Keyboard navigation:
↑ ↓ navigate files & folders
← → collapse/expand folder
Enter/Space toggle folder

Open a snapshot folder to get started

🏷 Name this folder

Give this _snaps folder a nickname -- typically the R package name -- so you can tell it apart from others in the history list.

You can rename it later by clicking the pencil icon in the folder list.

About SnapViewer

Vide-coded by Daniel Muenz

SnapViewer helps you browse and view testthat snapshot files in a local R package.

Open snapshot folders and browse files in a tree view with easy keyboard navigation
View markdown and image snapshots
Open folders for multiple packages and remember them across browsing sessions*

* In browsers without File System Access support, SnapViewer uses a fallback mode with limited persistence.

Finding the snapshot folder

If your R package is named package, then the snapshot folder (if it exists) is package/tests/testthat/_snaps. You can equivalently select any of the following folders, and SnapViewer will find the _snaps folder:

package
package/tests
package/tests/testthat
package/tests/testthat/_snaps

Selecting the root package folder is best because then SnapViewer knows the package name and suggests this as a nickname for labeling the snapshot folder within the app. Otherwise you can type in your own nickname.

📅 Modified

💾 Size

What is a snapshot folder?

It's a folder named _snaps created by testthat.
It contains snapshot files – markdown and images.
In an R package, the path is:

tests/testthat/_snaps

You can select any of the following:

the package root folder (best option),
tests,
tests/testthat,
or the _snaps folder directly.

Whichever you pick, SnapViewer will find _snaps.

Browser compatibility note

Several SnapViewer features are not available in your browser. Switch to Chrome or Edge to enable these features:

Point to snapshot folders for multiple packages and easily toggle between them.
Remember all previously accessed snapshot folders across browsing sessions.
Add newly created snapshot files to file list without re-selecting snapshot folder.