branch <- list(
  t = "Emph",
  c = list(
    list(
      t = "Str",
      c = "text"
    )
  )
)

res_branch <- list(t = list(Str = TRUE, Emph = TRUE), c = "text")

tree <- list(list(
  t = "Para",
  c = list(branch, branch)
))

res_tree <- list(
  list(t = list(Str = TRUE, Emph = TRUE, Para = TRUE), c = "text"),
  list(t = list(Str = TRUE, Emph = TRUE, Para = TRUE), c = "text")
)

test_that("add_type", {
  expect_identical(add_type(branch$c[[1]], branch$t), res_branch)
})

test_that("resolve_type", {
  expect_identical(resolve_type(branch$c[[1]]), branch$c[[1]])
  expect_identical(resolve_type(branch), list(res_branch))
})

test_that("flatten_branch", {
  expect_identical(flatten_branch(flatten_branch(tree)), res_tree)
})

test_that("flatten_ast", {
  expect_identical(flatten_ast(tree), res_tree)
})

test_that("branch2list", {
  expect_identical(
    branch2list(res_branch),
    list(txt = "text", Str = TRUE, Emph = TRUE)
  )
  expect_identical(
    branch2list(list(t = list("Space" = TRUE))), list(txt = " ", Space = TRUE)
  )
})

test_that("ast2df", {
  expect_identical(
    ast2df(list(blocks = tree)),
    tibble::tibble(
      txt = c("text", "text"),
      Str = c(TRUE, TRUE),
      Emph = c(TRUE, TRUE)
    )
  )
})