Nothing
#' This function (suggested by Lionel Henry) allows vdiffr to be used
#' conditionally, so it can remain in 'Suggests'
#' @noRd
expect_doppelganger <- function(title, fig, ...) {
testthat::skip_if_not_installed("vdiffr")
vdiffr::expect_doppelganger(title, fig, ...)
}
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