Nothing
test_that("construct_design works", {
expect_equal(construct_design(NULL), NULL)
df_test <- data.frame(a = 1:3)
expect_equal(ncol(construct_design(df_test)), 2)
df_test <- data.frame(a = factor(1:3))
expect_equal(ncol(construct_design(df_test)), 3)
})
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