Nothing
test_that("require_namespaces", {
expect_equal(require_namespaces("mlr3misc"), "mlr3misc")
expect_equal(require_namespaces("checkmate"), "checkmate")
expect_error(require_namespaces("this_is_not_a_package999"), "not be loaded", class = "packageNotFoundError")
expect_true(tryCatch(require_namespaces("this_is_not_a_package999"),
packageNotFoundError = function(e) TRUE))
expect_equal(tryCatch(require_namespaces("this_is_not_a_package999"),
packageNotFoundError = function(e) e$packages), "this_is_not_a_package999")
expect_true(require_namespaces("mlr3misc", quietly = TRUE))
expect_false(require_namespaces("this_is_not_a_package999", quietly = TRUE))
})
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