tests/testthat/test-install-dependencies.R

In learnr: Interactive Tutorials for R

context("install tutorial dependencies")

create_test_tutorial <- function(code) {
  tutorial_dir <- file.path(tempdir(), "tutorial-deps")
  dir.create(tutorial_dir)
  tutorial_path <- tempfile("tutorial-deps",
                            tmpdir = tutorial_dir,
                            fileext = ".R")
  writeLines(code, con = tutorial_path)
  invisible(tutorial_dir)
}

test_that("get_needed_pkgs returns appropriate packages", {
  tutorial_dir <- create_test_tutorial("library(pkg1)\npkg2::n()")
  on.exit(unlink(tutorial_dir, recursive = TRUE), add = TRUE)
  expect_equal(get_needed_pkgs(tutorial_dir), c("pkg1", "pkg2"))
})

test_that("get_needed_pkgs returns length 0 if no new packages", {
  tutorial_dir <- create_test_tutorial("sum()")
  on.exit(unlink(tutorial_dir, recursive = TRUE), add = TRUE)
  expect_equal(length(get_needed_pkgs(tutorial_dir)), 0)
})

test_that("tutorial dependency check returns NULL for no dependencies", {
  tutorial_dir <- create_test_tutorial("sum(1:3)")
  on.exit(unlink(tutorial_dir, recursive = TRUE), add = TRUE)

  expect_silent(install_tutorial_dependencies(tutorial_dir))
})

# test_that("tutorial dependency check works (interactive)", {
#   skip_if_not(interactive())
#
#   tutorial_dir <- create_test_tutorial("library(pkg1)\npkg2::n()")
#   on.exit(unlink(tutorial_dir, recursive = TRUE), add = TRUE)
#
#   expect_error(
#     with_mock(
#       ask_pkgs_install = function(x) 2,
#       install_tutorial_dependencies(tutorial_dir)
#     )
#   )
# })

test_that("tutorial dependency check works (not interactive)", {
  skip_if(interactive())

  tutorial_dir <- create_test_tutorial("library(pkg1)\npkg2::n()")
  on.exit(unlink(tutorial_dir, recursive = TRUE), add = TRUE)

  expect_error(install_tutorial_dependencies(tutorial_dir))
})