context("f_list") test_that("input must be a list", { expect_error(as_f_list(1), "must be a list") }) test_that("LHS must evaluate to a string", { expect_error(f_list(1 ~ x), "must evaluate to a string or name") expect_error(f_list(letters ~ x), "must evaluate to a single string") expect_error(f_list(x ~ x ~ z), "must be a single-sided formula") }) test_that("regular elements are left as is", { expect_equal(f_list(x = 1:10), list(x = 1:10)) expect_equal(f_list(x = ~x), list(x = ~x)) }) test_that("output is actually a formula", { out <- f_list(x = ~x)[[1]] expect_s3_class(out, "formula") expect_identical(attr(out, ".Environment"), environment()) }) test_that("output always has names", { out <- f_list(1, 2, 3) expect_equal(names(out), c("", "", "")) }) test_that("names taken from LHS of formula", { out1 <- f_list("x" ~ y) out2 <- f_list(quote(x) ~ y) var <- ~x out3 <- f_list(var ~ y); out3 expect_equal(out1, list(x = ~y)) expect_equal(out2, list(x = ~y)) expect_equal(out3, list(x = ~y)) }) test_that("null LHS leaves names unchanged", { expect_equal(f_list(x = NULL ~ y), list(x = ~y)) }) test_that("LHS evaluated in formula environment", { f <- function(x) { paste0(x, 1) ~ y } expect_equal(f_list(f("y")), list(y1 = ~ y)) })
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