library(ggplot2)
library(readr)
library(fs)

test_that("last images without ext are saved as png", {
  x <- ggplot(diamonds, aes(color)) + geom_bar()
  y <- write_last(x = x)
  expect_true(file_exists(y))
})

test_that("last images are saved with custom dimmensions", {
  x <- ggplot(diamonds, aes(color)) + geom_bar()
  y <- write_last(x = x, height = 5, width = 10, device = "jpg")
  expect_true(file_exists(y))
})

test_that("data frames are saved as tsv", {
  y <- write_last(x = mtcars, col_names = FALSE)
  expect_true(file_exists(y))
  expect_error(read_tsv(y, col_names = FALSE), NA)
})

test_that("vectors are saved as txt", {
  y <- write_last(x = state.name)
  expect_true(file_exists(y))
  expect_error(read_lines(y), NA)
})

test_that("lists are saved as rds", {
  y <- write_last(x = list(a = 1, b = "2"))
  expect_true(file_exists(y))
  expect_error(z <- read_rds(y), NA)
  expect_length(z, 2)
  expect_type(z, "list")
})

test_that("functions are saved as R source files", {
  y <- write_last(x = tibble::as_tibble)
  expect_true(file_exists(y))
  expect_error(z <- read_lines(y), NA)
  expect_true(grepl("^function", z[1]))
})

test_that("all other objects are saved as rds", {
  y <- write_last(x = austres)
  expect_true(file_exists(y))
  expect_error(z <- read_rds(y), NA)
  expect_equal(class(z), class(austres))
  expect_s3_class(z, "ts")
})

test_that("last object can be saved as rds", {
  y <- save_last(x = iris)
  expect_true(file_exists(y))
  expect_equal(path_ext(y), "rds")
})

test_that("last value is easily returned", {
  a <- state.name
  x <- last_value(x = state.name)
  expect_equal(x, a)
})

test_that("last data frames can be viewed in a window", {
  x <- mtcars
  y <- view_last(x = mtcars)
  expect_equal(x, y)
})