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context("f_interp")
test_that("protected against bad inputs", {
f <- ~ x + 1
attr(f, ".Environment") <- 10
expect_error(f_interp(f), "must be an environment")
})
test_that("interp produces single string for character inputs", {
x <- interp("aaaaaaaaaaaaaa + bbbbbbbbbbbbbbb + ccccccccccccccccc + dddddddddddddddd + eeeeeeeeeeeeeee")
expect_is(x, "character")
expect_equal(length(x), 1)
})
test_that("can interpolate from environment", {
env <- new.env(parent = emptyenv())
env$a <- 10
out <- interp(~ f(a), .values = env)
expect_identical(out, ~f(10))
})
# uq ----------------------------------------------------------------------
test_that("evaluates contents of uq()", {
expect_equal(f_interp(~ uq(1 + 2)), ~ 3)
})
test_that("unquoted formulas are interpolated first", {
f <- function(n) {
~ x + uq(n)
}
n <- 100
expect_equal(f_interp(~ uq(f(10))), ~ x + 10)
})
# uqs ---------------------------------------------------------------------
test_that("contents of uqs() must be a vector", {
expr <- ~ 1 + uqs(environment())
expect_error(f_interp(expr), "`x` must be a vector")
})
test_that("values of uqs() spliced into expression", {
expr <- ~ f(a, uqs(list(quote(b), quote(c))), d)
expect_identical(f_interp(expr), ~ f(a, b, c, d))
})
test_that("names within uqs() are preseved", {
expr <- ~ f(uqs(list(a = quote(b))))
expect_identical(f_interp(expr), ~ f(a = b))
})
# uqf ---------------------------------------------------------------------
test_that("requires formula", {
expect_error(f_interp(~ uqf(10)), "must be a formula")
})
test_that("interpolates formula", {
expect_equal(f_interp(~ uqf(x ~ y)), ~ (x ~ y))
})
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