test_that("can do frequency polygon with categorical x", {
df <- data_frame(x = rep(letters[1:3], 3:1))
p <- ggplot(df, aes(x)) + geom_freqpoly(stat = "count")
d <- layer_data(p)
expect_s3_class(d$x, "mapped_discrete")
expect_equal(d$x, mapped_discrete(1:3))
expect_equal(d$y, 3:1)
})
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