test_that("Stack() returns shiny.tag, correct name and value", {
  expect_true(inherits(Stack(), "shiny.tag"))
  expect_equal(environment(Stack()[["children"]][[2]])[["data"]][["name"]], "Stack")
  expect_equal(environment(Stack("Test")[["children"]][[2]])[["data"]][["props"]][["value"]][["children"]], "Test")
})