context("citation")
test_that("citations", {
  a <- move(x = 1:10, y = 1:10, time = as.POSIXct(1:10, origin = "1970-1-1"))
  expect_equal(licenseTerms(a), character())
  licenseTerms(a) <- "bla"
  expect_equal(licenseTerms(a), "bla")
  expect_error(licenseTerms(a) <- factor("a"))
  expect_warning(licenseTerms(a) <- c("a", "a"))
})