tests/testthat/test-system.R

In traitecoevo/callr: Call R Functions from the Command Line

context("call_system")

test_that("basic", {
  ## Just to pick something that will be installed for sure:
  R <- file.path(R.home("bin"), "R")
  ## See: https://github.com/hadley/testthat/issues/144
  Sys.setenv("R_TESTS" = "")

  dquote <- function(x) sprintf('"%s"', x)
  output <- call_system(R, c("-e", dquote("message('hello')")))
  expect_that(any(grepl("hello", output)), is_true())

  expect_that(call_system(R, c("-e", dquote("stop('myerror')"))),
              throws_error("Error: myerror"))
  expect_that(call_system(R, c("-e", dquote("stop('myerror')"))),
              throws_error("had status"))
})

test_that("Sys_which", {
  expect_that(Sys_which(NULL), throws_error("scalar"))
  expect_that(Sys_which(character(0)), throws_error("scalar"))

  if (Sys.which("R") != "") {
    expect_that(Sys_which("R"), equals(Sys.which("R")))
  }

  expect_that(Sys_which("this-does-not-exist"), throws_error("not found"))
})