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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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