Fix #6 construct write_xaringan_theme using its argument names

R/utils.R

 #' @keywords internal
 call_write_xaringan_theme <- function() {
   paste0("write_xaringan_theme(",
-         paste(template_variables$variable, collapse = ", "),
-         ", extra_css, outfile",
+         paste(names(formals(write_xaringan_theme)), collapse = ", "),
          ")")
 }
 

tests/testthat/test-write_xaringan_theme.R

+context("test-write_xaringan_theme")
+
+test_that("write_xaringan_theme() writes to specified outfile", {
+  tmpfile <- tempfile(fileext = ".css")
+  expect_equal(duo_accent(outfile = tmpfile), tmpfile)
+  expect_true(file.exists(tmpfile))
+  expect_true(grepl("xaringanthemer", readLines(tmpfile)[3]))
+})