test_that("top_n returns n rows", {
test_df <- data.frame(x = 1:10, y = 11:20)
top_four <- test_df %>% top_n(4, y)
expect_equal(dim(top_four), c(4, 2))
})
test_that("top_n() handles missing `wt`", {
df <- data.frame(x = c(10, 4, 1, 6, 3, 1, 1))
expect_message(
regexp = "Selecting by x",
expect_identical(top_n(df, 2)$x, c(10, 6))
)
})
test_that("top_n() handles calls", {
expect_identical(top_n(mtcars, 2, -disp), top_n(mtcars, -2, disp))
})
test_that("top_n() quotes n", {
expect_snapshot(res1 <- top_n(mtcars, n() * .5))
expect_snapshot(res2 <- top_n(mtcars, 16))
expect_identical(res1, res2)
})
test_that("top_frac() is a shorthand for top_n(n()*)", {
expect_identical(top_n(mtcars, n() * .5, disp), top_frac(mtcars, .5, disp))
expect_snapshot(res1 <- top_n(mtcars, n() * .5))
expect_snapshot(res2 <- top_frac(mtcars, .5))
})
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