test_that("No WS is kept if field is not modified", {
  d <- description$new(test_path("D3"))
  tmp <- tempfile()
  on.exit(unlink(tmp), add = TRUE)
  d$write(tmp)
  expect_equal(readLines(test_path("D3")), readLines(tmp))
})

test_that("WS is present in newly created fields", {
  d <- description$new(test_path("D3"))
  tmp <- tempfile()
  on.exit(unlink(tmp), add = TRUE)
  d$set("Foobar" = "\n    TRAZ")
  d$write(tmp)
  contents <- paste0(paste0(readLines(tmp), collapse = "\n"), "\n")
  expect_match(contents, "\nFoobar: \n    TRAZ\n")
})

test_that("WS is present in newly created files", {
  desc <- description$new("!new")
  tmp <- tempfile()
  on.exit(unlink(tmp), add = TRUE)
  desc$write(tmp)
  contents <- paste0(readLines(tmp), collapse = "\n")
  expect_match(contents, "\nAuthors@R: \n")
})

test_that("WS is added if field is changed", {
  d <- description$new(test_path("D3"))
  tmp <- tempfile()
  on.exit(unlink(tmp), add = TRUE)
  d$set(Author = "Gabor Csardi <foo@bar.com>")
  d$write(tmp)
  contents <- paste0(readLines(tmp), collapse = "\n")
  expect_match(contents, "Author: ")
})

test_that("No WS is added if an other field is changed", {
  d <- description$new(test_path("D3"))
  tmp <- tempfile()
  on.exit(unlink(tmp), add = TRUE)
  d$add_author("Gabor", "Csardi", "foo@bar.com")
  d$write(tmp)
  contents <- paste0(readLines(tmp), collapse = "\n")
  expect_match(contents, "Imports:\n")
})