library(ggplot2) test_that("themes are correct", { testthat::skip_on_cran() df <- data.frame(x = 1:3, y = 1:3, z = c("a", "b", "a"), a = 1) plot <- ggplot(df, aes(x, y, colour = z)) + geom_point() + facet_wrap(~ a) vdiffr::expect_doppelganger("theme_atlas", plot + theme_atlas()) })