test_that("statichtmlWidget works", {
  shw <- statichtmlWidget(htmltools::HTML("<div>Hello!!</div>"),
                          width = 100,
                          height = 20,
                          elementId = "asdf",
                          sizingPolicy =
                            htmlwidgets::sizingPolicy(),
                          js = "alert('Hello!')")
  tmpdir <- withr::local_tempdir()
  tmpfil <- file.path(tmpdir, "index.html")
  htmltools::save_html(shw, tmpfil)
  expect_true(file.exists(tmpfil))
  expect_gt(file.size(tmpfil), 620)
  expect_true(dir.exists(file.path(tmpdir, "lib")))
  expect_true(any(grepl('id="asdf"',
        fixed = TRUE,
        x = readLines(tmpfil))))
  expect_true(any(grepl("<div>Hello!!<\\/div>",
                        fixed = TRUE,
                        x = readLines(tmpfil))))
  expect_true(any(grepl("alert('Hello!')",
                        fixed = TRUE,
                        x = readLines(tmpfil))))

})