targets::tar_test("tar_knitr_deps_expr()", {
  skip_rmarkdown()
  lines1 <- c(
    "---",
    "title: report",
    "output_format: html_document",
    "---",
    "",
    "```{r}",
    "tar_load(data1)",
    "tar_read(data2)",
    "```"
  )
  lines2 <- c(
    "---",
    "title: report",
    "output_format: html_document",
    "---",
    "",
    "```{r}",
    "tar_load(data2)",
    "tar_read(data3)",
    "```"
  )
  report1 <- tempfile()
  report2 <- tempfile()
  writeLines(lines1, report1)
  writeLines(lines2, report2)
  out <- tar_knitr_deps_expr(c(report1, report2))
  expect_true(is.language(out))
  out <- targets::tar_deparse_safe(out)
  exp <- "list(data1, data2, data3)"
  expect_equal(out, exp)
})