feat: Disable new snapshot error

[schloerke]

#2149 added new feature:

• expect_snapshot() and friends will now fail when creating a new snapshot on CI. This is usually a signal that you've forgotten to run it locally before committing (Should initial snapshot error on CI? #1461).

---

This is problematic for packages with many snapshots.

Situation:

• Package has many visual snapshot tests
• Many snaps cause package to be larger than 5mb
• These snaps a never used within revdep checks

Previous solution:

• R build Ignore the tests/testthat/_snaps folder. Nothing is sent to CRAN and nothing is tested on CI. Local testing performs full snapshot testing.

---

Proposal:

• The default value of fail_on_new should be determined by the existence of the _snaps folder: fail_on_new = fs::dir_exists(here::here("tests/testthat/_snaps"))
  • Behavior:
    • If no snaps exist during testing, do not fail on new snaps (new behavior)
    • else fail then any new snap should cause a CI failure (current behavior)

[schloerke]

🤦 My snaps are all svg via {vdiffr}. They should work across every OS and R version.

Ideally, I'd like for my tests to run on GHA if possible.

For my situation where the snaps should be the same across every OS and R version, I'll make a script within GHA to alter the .Rbuildignore to include the snaps folder. This way I'll never deploy a bad ignore file to CRAN.

---

Closing as my situation is covered by altering the .Rbuildignore before testing within GHA.

[schloerke]

Unfortunately, this is still an issue.

When running on all OS / R versions, the SVG images produced by ggplot2 are slightly different.

From Claude:

The diff shows very minor differences between the two SVG files - they appear to be small coordinate/positioning adjustments (differences in decimal places for x/y coordinates). The content and structure are essentially identical, with only slight rendering precision differences.

Here's a summary of the differences:

• Coordinates: Minor adjustments in positioning (e.g., 39.75 → 40.15, 697.60 → 697.31)
• Dimensions: Slight changes in width/height (e.g., 657.85 → 657.16, 179.62 → 179.48)
• Text positions: Micro-adjustments in text anchor points
• Visual content: Identical - same percentages, same labels, same structure

These are likely due to minor differences in rendering engine precision or R graphics device settings between when the two files were generated. The files are functionally equivalent for visual comparison purposes.

File diff

--- /ggally/tests/testthat/_snaps/ggbivariate/tips-title.svg	2026-02-02 13:49:11
+++ /ggally/tests/testthat/_snaps/ggbivariate/tips-title.new.svg	2026-02-03 13:38:16
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[schloerke]

Current situation:

• If I test on all OS / R versions, the correct vdiffr snaps will not agree on different OS / R combinations.
• If I ignore the tests folder, new snaps appear. This raises an error.
• If I only test the snaps on mac, new snaps appear on other OS

Ideas:

• Add a variant for every OS / R version.
  • This is overkill and makes testing not fun
• Add a feature in testthat to ignore new snaps if no snaps folder exists at start time
  • Requires an update to testthat 😞
• Adjust testing to have a tests/testthat/test-snaps-NAME.R and ignore those test files too as they are running dead tests on CRAN / revdep
  • Makes it so I can test snaps on macos only on GHA
  • 🎂 ? Seems like best workaround so far