test_that("aesthetic checking in geom throws correct errors", {
p <- ggplot(mtcars) + geom_point(aes(disp, mpg, colour = after_scale(data)))
expect_snapshot_error(ggplotGrob(p))
aes <- list(a = 1:4, b = letters[1:4], c = TRUE, d = 1:2, e = 1:5)
expect_snapshot_error(check_aesthetics(aes, 4))
})
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