tests/testthat/test_read_SPE2R.R

In R-Lum/Luminescence: Comprehensive Luminescence Dating Data Analysis

## path to the SPE file on github, as it's not included in the package
github.url <- file.path("https://github.com/R-Lum/Luminescence",
                        "raw/master/tests/testthat/_data")

## `read_SPE2R()` calls `download.file()` which, in turn, uses curl to
## perform the actual download. If `verbose = TRUE`, curl is invoked with
## `quiet = FALSE`, and the output it produces cannot be captured by `SW()`,
## nor by other simple R approaches because curl writes directly to the
## console bypassing R. The workaround is to divert all output to a file, see:
## https://stackoverflow.com/questions/66138345/how-to-suppress-download-file-trying-url-message-in-r
sink.curl.messages <- function(expr) {
  nullcon <- file(nullfile(), open = "wb")
  sink(nullcon, type = "message")
  expr
  sink(type = "message")
  close(nullcon)
}

test_that("input validation", {
  testthat::skip_on_cran()

  expect_message(expect_null(read_SPE2R("error")),
                 "Error: File does not exist, NULL returned")
  expect_error(read_SPE2R(file.path(github.url, "SPEfile.SPE"),
                          output.object = "error"),
               "'output.object' not supported, valid options are")

  SW({
  expect_message(expect_null(read_SPE2R("http://httpbun.org/status/404")),
                 "Error: File does not exist, NULL returned")
  })

  wrong <- system.file("extdata/BINfile_V8.binx", package = "Luminescence")
  expect_error(read_SPE2R(wrong),
               "Unsupported file format")
})

test_that("Test general functionality", {
  testthat::skip_on_cran()

  ## default values
  sink.curl.messages(
  expect_output(
      expect_s4_class(read_SPE2R(file.path(github.url, "SPEfile.SPE")),
                      "RLum.Data.Image"),
      "URL detected, checking connection")
  )

  ## test output.object
  expect_s4_class(read_SPE2R(file.path(github.url, "SPEfile.SPE"),
                             output.object = "RLum.Data.Spectrum",
                             verbose = FALSE),
                  "RLum.Data.Spectrum")
  ret <- read_SPE2R(file.path(github.url, "SPEfile.SPE"),
                    output.object = "matrix",
                    verbose = FALSE)
  expect_true(is.matrix(ret))
})