tests/testthat/test-json.R

In rstudio/renv: Project Environments

test_that("sample JSON strings can be read", {

  expect_identical(
    renv_json_read(text = '[true, false, null]'),
    list(TRUE, FALSE, NULL)
  )

  expect_identical(
    renv_json_read(text = '{"{}": "::"}'),
    list("{}" = "::")
  )

  expect_identical(
    renv_json_read(text = '[{"a": 1.0}, {"b": -1e5}]'),
    list(list(a = 1.0), list(b = -1E5))
  )

  expect_identical(
    renv_json_read(text = '[{}, [], {}]'),
    list(named(list()), list(), named(list()))
  )

  expect_identical(
    renv_json_read(text = '[{"]": "["}]'),
    list(list("]" = "["))
  )

})

test_that("sample R objects can be converted to JSON", {

  before <- list(alpha = 1, beta = 2)
  json <- renv_json_convert(before)
  after <- renv_json_read(text = json)
  expect_equal(before, after)

})

test_that("empty R lists are converted as expected", {

  data <- list()
  json <- renv_json_convert(data)
  expect_equal(json, "[]")

  names(data) <- character()
  json <- renv_json_convert(data)
  expect_equal(json, "{}")

})

test_that("we can parse a GitHub remotes specification", {

  skip_slow()

  data <- renv_remotes_resolve("rstudio/renv")
  expect_true(data$Source == "GitHub")
  expect_true(data$RemoteUsername == "rstudio")
  expect_true(data$RemoteRepo == "renv")

})

test_that("we can parse a GitHub remotes specification with 'wininet'", {
  skip_on_cran()
  skip_on_os("windows")
  skip_if_not(renv_platform_windows())

  renv_scope_envvars(RENV_DOWNLOAD_FILE_METHOD = "wininet")
  data <- renv_remotes_resolve("rstudio/renv")
  expect_true(data$Source == "GitHub")
  expect_true(data$RemoteUsername == "rstudio")
  expect_true(data$RemoteRepo == "renv")

})

test_that("we can read json containing escape characters", {
  actual <- list(data = "\\\"")
  json <- renv_json_convert(actual)
  expected <- renv_json_read(text = json)
  expect_equal(actual, expected)
})

test_that("JSON null is read as R NULL", {
  json <- "{\"NULL\": null}"
  actual <- renv_json_read(text = json)
  expected <- list("NULL" = NULL)
  expect_equal(actual, expected)
})

test_that("some common control characters are escaped", {
  json <- renv_json_convert("\b\f\n\r\t")
  expect_equal(json, "\"\\b\\f\\n\\r\\t\"")
})

test_that("scalar values are boxed if requested", {

  json <- renv_json_convert(
    object = list(A = "hello", B = "world"),
    config = list(box = "B")
  )

  value <- renv_json_read(text = json)
  expect_equal(value, list(A = "hello", B = list("world")))

})

test_that("the renv + jsonlite JSON readers are compatible", {

  skip_if_not_installed("jsonlite")

  renv_tests_scope("breakfast")
  init()

  lhs <- renv_json_read_default("renv.lock")
  rhs <- renv_json_read_jsonlite("renv.lock")
  expect_equal(lhs, rhs)

})

test_that("NA values are properly serialized", {

  expect_equal(renv_json_write(NA, file = NULL), "null")
  expect_equal(renv_json_write(NA_character_, file = NULL), "null")

  expect_equal(renv_json_write(NA_real_, file = NULL), "null")
  expect_equal(renv_json_write(NA_integer_, file = NULL), "null")
  expect_equal(renv_json_write(NA_complex_, file = NULL), "null")
  expect_equal(renv_json_write(NaN, file = NULL), "null")

})

test_that("we fall back to the internal JSON reader if jsonlite fails", {

  skip_if_not_installed("jsonlite")
  json <- renv_json_read(text = "[key: NA]")
  expect_equal(json, list(key = NA))

})

test_that("json-read.R can function standalone", {

  renv_tests_scope()

  renv <- asNamespace("renv")
  keys <- ls(envir = renv, pattern = "^renv_json_read", all.names = TRUE)
  vals <- mget(c("%||%", keys), envir = renv)

  # put those into a separate environment inheriting only from base, and
  # re-mark those as inheriting from base (so they only 'see' each-other)
  envir <- new.env(parent = baseenv())
  list2env(vals, envir = envir)

  # for each function, check that it only uses functions from base
  ok <- list()
  for (val in vals) {
    recurse(body(val), function(node, stack) {
      if (is.call(node) && is.symbol(node[[1L]])) {
        lhs <- as.character(node[[1L]])
        ok[[lhs]] <<- exists(lhs, envir = envir)
      }
    })
  }

  # convert to logical vector
  ok <- convert(ok, "logical")
  bad <- names(ok)[!ok]
  if (length(bad) != 0L) {
    fmt <- "json-read.R is not standalone: %s"
    stopf(fmt, paste(bad, collapse = ", "))
  }

})