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context("lazy")
lazy_caller <- function(arg) {
lazy(arg)
}
outer_fun <- function(arg) {
lazy_caller(arg)
}
test_that("basic lazy() functionality works", {
expect_equal(lazy_caller(0)$expr, 0)
expect_equal(lazy_caller("char")$expr, "char")
expect_equal(lazy_caller(sym)$expr, as.name("sym"))
expect_equal(lazy_caller(call("name"))$expr, quote(call("name")))
})
test_that("lazy() works with nested promises", {
expect_equal(outer_fun(0)$expr, 0)
expect_equal(outer_fun("char")$expr, "char")
expect_equal(outer_fun(sym)$expr, as.name("sym"))
expect_equal(outer_fun(call("name"))$expr, quote(call("name")))
})
test_that("lazy() does not unpack lazily loaded objects", {
lazy <- lazy_caller(mean)
expect_equal(deparse(lazy$expr), "mean")
nested_lazy <- outer_fun(mean)
expect_equal(deparse(lazy$expr), "mean")
outer_fun2 <- function() {
list(
lazy = lazy_caller(mean),
env = environment()
)
}
embedded_lazy <- outer_fun2()
expect_identical(embedded_lazy$lazy$expr, as.name("mean"))
expect_identical(embedded_lazy$lazy$env, embedded_lazy$env)
})
test_that("lazy() works for double-colon operator", {
expect_error(lazy <- lazy_caller(stats::runif(10)), NA)
expect_error(nested_lazy <- outer_fun(stats::runif(10)), NA)
})
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