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