Nothing
# vdiffr ignores failures when
# - VDIFFR_RUN_TESTS is "false" (on Travis CI with older versions and dev version of R)
# - CI is not set (on CRAN)
if (requireNamespace("vdiffr", quietly = TRUE)) {
expect_doppelganger <- vdiffr::expect_doppelganger
} else {
# If vdiffr is not available and visual tests are not explicitly disabled, raise error.
if (!identical(Sys.getenv("VDIFFR_RUN_TESTS"), "false")) {
stop("vdiffr is not installed")
}
# Otherwise, assign a dummy function
expect_doppelganger <- function(...) skip("vdiffr is not installed.")
}
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