test_that("no scale for NULL aesthetic", {
expect_equal(find_scale("colour", NULL), NULL)
})
test_that("no scale for Inf aesthetic", {
expect_equal(find_scale("colour", Inf), NULL)
})
test_that("message + continuous for unknown type", {
x <- structure(1:10, class = "ggplot2_foo")
expect_message(scale <- find_scale("colour", x), "ggplot2_foo")
expect_s3_class(scale, "ScaleContinuous")
})
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