I’m working on embedding svglite in vdiffr and compiling statically to FreeType and Harfbuzz to make SVG generation deterministic across platforms. Until then vdiffr will remain a bit unstable (but should silently fail if dependencies have diverged).
last_collection_error() to print a testthat error that occurred while collecting the test cases.We plan to fix these issues once and for all by embedding gdtools, svglite, Cairo and FreeType in the vdiffr package.
This release fixes some CRAN failures.
Test cases of the mock package were updated to FreeType 2.8.0.
The unit test log file from the mock package is now preserved.
This release makes it easier to debug failures on remote systems. It also makes vdiffr more robust to failures caused by incompatible installations: instead of failing, the tests are skipped. This prevents spurious failures on CRAN.
expect_doppelganger() gains a verbose argument to print the SVG files for failed cases while testing. This is useful to debug failures on remotes.
When tests are run by R CMD check, failures are now recorded in a log file called vdiffr.fail. This file will show up in the Travis log and can be retrieved from artifacts on Appveyor. It includes the SVG files for failed cases, which is useful to debug failures on remotes.
The tests are now skipped if the FreeType version used to build the comparison SVGs does not match the version installed on the system where the tests are run. This is necessary because changes in new version of FreeType might affect the computation of text extents, which then causes svglite to produce slightly different SVGs. The minor version is not taken into account so FreeType 2.7.1 is deemed compatible with 2.7.2 but not with 2.8.0.
In practice, this means that package contributors should only validate visual cases if their FreeType version matches the one of the package maintainer. Also, the maintainer must update the version recorded in the package repository (in the file ./tests/figs/deps.txt) when FreeType has been updated on their system. Running vdiffr::validate_cases() updates the dependency file even if there are no visual case to update.
In the future, we may provide a version of vdiffr statically compiled with a specific version of FreeType to prevent these issues.
expect_doppelganger() no longer throws an error when FreeType is too old. Instead, the test is skipped. This ensures that R CMD check passes on those platforms (e.g., CRAN’s Solaris test server).
Depends on gdtools 0.1.2 or later as this version fixes a crash on Linux platforms.
widget_toggle(), widget_slide() and widget_diff() now take plots as arguments. This makes it easy to embed a vdiffr widget in R Markdown documents. The underscored versions take HTML sources as argument (paths to SVG files or inline SVGs).
Generated SVGs are now reproducible across platforms thanks to recent versions of svglite, gdtools, and the new package fontquiver. vdiffr now requires versions of FreeType greater than 2.6.1.
The figures folder is hardcoded to tests/figs/.
The figures are now stored in subfolders according to the current testthat context. expect_doppelganger() accepts the path argument to bypass this behaviour (set it to "" to store the figures in tests/figs/).
The title argument of expect_doppelganger() now serves as ggtitle() in ggplot2 figures (unless a title is already set). It is also standardised and used as filename to store the figure (spaces and non-alphanumeric characters are converted to dashes).
Add support for handling orphaned cases: you can now remove figures left over from deleted tests with delete_orphaned_cases() or from the Shiny app.
New filter argument to collect_cases() and manage_cases(). This lets you filter the test files from which to collect the cases, which is useful to speed up the collection for large codebases with a lot of unit tests.
Fix invalid generation of SVG files (#3)
Give a warning when multiple doppelgangers have the same name (#4).
Remove CR line endings before comparing svg files for compatibility with Windows
Initial release