tests/testthat/test-saveAndLoadJson.R

In ParallelLogger: Support for Parallel Computation, Logging, and Function Automation

library("testthat")

test_that("data.frame restore", {
  fileName <- tempfile()
  settings <- list(
    a = "a",
    b = data.frame(
      x = c(1, 2, 3),
      y = c("p", "q", "r"),
      stringsAsFactors = FALSE
    )
  )
  saveSettingsToJson(settings, fileName)
  settings2 <- loadSettingsFromJson(fileName)
  unlink(fileName)
  expect_equal(class(settings$b), class(settings2$b))
  expect_equivalent(settings, settings2)
})

test_that("tibble restore", {
  fileName <- tempfile()
  settings <- list(
    a = "a",
    b = tibble::tibble(
      x = c(1, 2, 3),
      y = c("p", "q", "r")
    )
  )
  saveSettingsToJson(settings, fileName)
  settings2 <- loadSettingsFromJson(fileName)
  unlink(fileName)
  expect_equal(class(settings$b), class(settings2$b))
  expect_equivalent(settings, settings2)
})

test_that("Named class member restore", {
  fileName <- tempfile()
  b <- list(
    x = c(1, 2, 3),
    y = c("p", "q", "r")
  )
  class(b) <- "MyClass"
  settings <- list(
    a = "a",
    b = b
  )
  saveSettingsToJson(settings, fileName)
  settings2 <- loadSettingsFromJson(fileName)
  unlink(fileName)
  expect_equal(class(settings$b), class(settings2$b))
  expect_equivalent(settings, settings2)
})

test_that("Unnamed list restore (and not named)", {
  fileName <- tempfile()
  x <- list(a = 1, b = 2)
  class(x) <- "MyClass"
  settings <- list(x, x)
  saveSettingsToJson(settings, fileName)
  settings2 <- loadSettingsFromJson(fileName)
  unlink(fileName)
  expect_equal(class(settings$b), class(settings2$b))
  expect_equivalent(settings, settings2)
  expect_equal(names(settings), names(settings2))
})


test_that("list with empty vectors", {
  fileName <- tempfile()
  settings <- list(
    x = "a",
    y = c()
  )
  saveSettingsToJson(settings, fileName)
  settings2 <- loadSettingsFromJson(fileName)
  unlink(fileName)
  expect_equal(class(settings$y), class(settings2$y))
  expect_equivalent(settings, settings2)
})

test_that("object with member function", {
  fileName <- tempfile()
  obj <- list(fun = function(x) {
    2 * x
  })
  saveSettingsToJson(obj, fileName)
  obj2 <- loadSettingsFromJson(fileName)
  unlink(fileName)
  expect_equal(obj$fun(10), obj2$fun(10))
})

test_that("list with object with member function", {
  fileName <- tempfile()
  obj <- list(fun = function(x) {
    2 * x
  })
  objList <- list(obj)
  saveSettingsToJson(objList, fileName)

  objList2 <- loadSettingsFromJson(fileName)
  unlink(fileName)

  expect_equal(obj$fun(10), objList2[[1]]$fun(10))
})

test_that("data.frame restore, data.frame is first item in list", {
  fileName <- tempfile()
  settings <- list(
    b = data.frame(
      x = c(1, 2, 3),
      y = c("p", "q", "r"),
      stringsAsFactors = FALSE
    ),
    a = "a"
  )
  saveSettingsToJson(settings, fileName)
  settings2 <- loadSettingsFromJson(fileName)
  unlink(fileName)
  expect_equal(class(settings$b), class(settings2$b))
  expect_equivalent(settings, settings2)
})

test_that("tibble restore, tibble is first item in list", {
  fileName <- tempfile()
  settings <- list(
    b = tibble::tibble(
      x = c(1, 2, 3),
      y = c("p", "q", "r")
    ),
    a = "a"
  )
  saveSettingsToJson(settings, fileName)
  settings2 <- loadSettingsFromJson(fileName)
  unlink(fileName)
  expect_equal(class(settings$b), class(settings2$b))
  expect_equivalent(settings, settings2)
})

test_that("Empty data.frame restore", {
  fileName <- tempfile()
  settings <- list(
    b = data.frame(
      x = c(1, 2, 3),
      y = c("p", "q", "r"),
      stringsAsFactors = FALSE
    ),
    a = "a"
  )
  settings$b <- settings$b[c(),]
  saveSettingsToJson(settings, fileName)
  settings2 <- loadSettingsFromJson(fileName)
  unlink(fileName)
  expect_equal(class(settings$b), class(settings2$b))
})