test_that("The `fmt_scientific()` function works correctly", {

  # Create an input data frame four columns: two
  # character-based and two that are numeric
  data_tbl <-
    data.frame(
      char_1 = c("saturday", "sunday", "monday", "tuesday",
                 "wednesday", "thursday", "friday"),
      char_2 = c("june", "july", "august", "september",
                 "october", "november", "december"),
      num_1 = c(1836.23, 2763.39, 937.29, 643.00, 2.232, 0, -23.24),
      num_2 = c(34, 74, 23, 93, 35, 76, 57),
      stringsAsFactors = FALSE
    )

  # Create a `tbl_latex` object with `gt()` and the
  # `data_tbl` dataset
  tbl_latex <- gt(data_tbl)

  # Format the `num_1` column to 2 decimal places, use all
  # other defaults; extract `output_df` in the HTML context
  # and compare to expected values
  expect_equal(
    (tbl_latex %>%
       fmt_scientific(columns = "num_1", decimals = 2) %>%
       render_formats_test("latex"))[["num_1"]],
    c(
      "$1.84 \\times 10^{3}$", "$2.76 \\times 10^{3}$",
      "$9.37 \\times 10^{2}$", "$6.43 \\times 10^{2}$",
      "$2.23$", "$0.00$", "$-2.32 \\times 10^{1}$")
  )

  # Format the `num_1` column to 5 decimal places, use all
  # other defaults; extract `output_df` in the HTML context
  # and compare to expected values
  expect_equal(
    (tbl_latex %>%
       fmt_scientific(columns = "num_1", decimals = 5) %>%
       render_formats_test("latex"))[["num_1"]],
    c(
      "$1.83623 \\times 10^{3}$", "$2.76339 \\times 10^{3}$",
      "$9.37290 \\times 10^{2}$", "$6.43000 \\times 10^{2}$",
      "$2.23200$", "$0.00000$", "$-2.32400 \\times 10^{1}$")
  )

  # Format the `num_1` column to 2 decimal places, use a period for the
  # digit grouping separators and a comma for the decimal mark, use
  # all other defaults; extract `output_df` in the HTML context and
  # compare to expected values
  expect_equal(
    (tbl_latex %>%
       fmt_scientific(
         columns = "num_1", decimals = 2,
         sep_mark = ".", dec_mark = ","
       ) %>%
       render_formats_test("latex"))[["num_1"]],
    c(
      "$1,84 \\times 10^{3}$", "$2,76 \\times 10^{3}$",
      "$9,37 \\times 10^{2}$", "$6,43 \\times 10^{2}$",
      "$2,23$", "$0,00$", "$-2,32 \\times 10^{1}$")
  )

  # Format the `num_1` column to 4 decimal places, scale all values by
  # 1/1000, use all other defaults; extract `output_df` in the HTML
  # context and compare to expected values
  expect_equal(
    (tbl_latex %>%
       fmt_scientific(columns = "num_1", decimals = 4, scale_by = 1/1000) %>%
       render_formats_test("latex"))[["num_1"]],
    c(
      "$1.8362$", "$2.7634$",
      "$9.3729 \\times 10^{-1}$", "$6.4300 \\times 10^{-1}$",
      "$2.2320 \\times 10^{-3}$", "$0.0000$", "$-2.3240 \\times 10^{-2}$")
  )

  # Format the `num_1` column to 2 decimal places, prepend and append
  # all values by 2 different literals, use all other defaults; extract
  # `output_df` in the HTML context and compare to expected values
  expect_equal(
    (tbl_latex %>%
       fmt_scientific(columns = "num_1", decimals = 2, pattern = "a {x} b") %>%
       render_formats_test("latex"))[["num_1"]],
    c(
      "a $1.84 \\times 10^{3}$ b", "a $2.76 \\times 10^{3}$ b",
      "a $9.37 \\times 10^{2}$ b", "a $6.43 \\times 10^{2}$ b",
      "a $2.23$ b", "a $0.00$ b", "a $-2.32 \\times 10^{1}$ b")
  )

  # Format the `num_1` column to 2 decimal places, force the sign
  expect_equal(
    (tbl_latex %>%
       fmt_scientific(
         columns = num_1, decimals = 3, force_sign_m = TRUE) %>%
       render_formats_test("latex"))[["num_1"]],
    c(
      "$+1.836 \\times 10^{3}$", "$+2.763 \\times 10^{3}$",
      "$+9.373 \\times 10^{2}$", "$+6.430 \\times 10^{2}$",
      "$+2.232$", "$0.000$", "$-2.324 \\times 10^{1}$"
    )
  )

  # Format the `num_1` column to 2 decimal places, force the sign and
  # define a pattern for decorating values
  expect_equal(
    (tbl_latex %>%
       fmt_scientific(
         columns = num_1, pattern = "*{x}*", force_sign_m = TRUE) %>%
       render_formats_test("latex"))[["num_1"]],
    c(
      "*$+1.84 \\times 10^{3}$*", "*$+2.76 \\times 10^{3}$*",
      "*$+9.37 \\times 10^{2}$*", "*$+6.43 \\times 10^{2}$*",
      "*$+2.23$*", "*$0.00$*", "*$-2.32 \\times 10^{1}$*"
    )
  )

  # Format the `num_1` column to 2 decimal places, apply the `en_US`
  # locale and use all other defaults; extract `output_df` in the HTML
  # context and compare to expected values
  expect_equal(
    (tbl_latex %>%
       fmt_scientific(columns = "num_1", decimals = 2, locale = "en_US") %>%
       render_formats_test("latex"))[["num_1"]],
    c(
      "$1.84 \\times 10^{3}$", "$2.76 \\times 10^{3}$",
      "$9.37 \\times 10^{2}$", "$6.43 \\times 10^{2}$",
      "$2.23$", "$0.00$", "$-2.32 \\times 10^{1}$")
  )

  # Format the `num_1` column to 2 decimal places, apply the `da_DK`
  # locale and use all other defaults; extract `output_df` in the HTML
  # context and compare to expected values
  expect_equal(
    (tbl_latex %>%
       fmt_scientific(columns = "num_1", decimals = 2, locale = "da_DK") %>%
       render_formats_test("latex"))[["num_1"]],
    c(
      "$1,84 \\times 10^{3}$", "$2,76 \\times 10^{3}$",
      "$9,37 \\times 10^{2}$", "$6,43 \\times 10^{2}$",
      "$2,23$", "$0,00$", "$-2,32 \\times 10^{1}$")
  )

  # Format the `num_1` column to 2 decimal places, apply the `de_AT`
  # locale and use all other defaults; extract `output_df` in the HTML
  # context and compare to expected values
  expect_equal(
    (tbl_latex %>%
       fmt_scientific(columns = "num_1", decimals = 2, locale = "de_AT") %>%
       render_formats_test("latex"))[["num_1"]],
    c(
      "$1,84 \\times 10^{3}$", "$2,76 \\times 10^{3}$",
      "$9,37 \\times 10^{2}$", "$6,43 \\times 10^{2}$",
      "$2,23$", "$0,00$", "$-2,32 \\times 10^{1}$")
  )

  # Format the `num_1` column to 2 decimal places, apply the `et_EE`
  # locale and use all other defaults; extract `output_df` in the HTML
  # context and compare to expected values
  expect_equal(
    (tbl_latex %>%
       fmt_scientific(columns = "num_1", decimals = 2, locale = "et_EE") %>%
       render_formats_test("latex"))[["num_1"]],
    c(
      "$1,84 \\times 10^{3}$", "$2,76 \\times 10^{3}$",
      "$9,37 \\times 10^{2}$", "$6,43 \\times 10^{2}$",
      "$2,23$", "$0,00$", "$-2,32 \\times 10^{1}$")
  )

  # Format the `num_1` column to 2 decimal places, apply the `gl_ES`
  # locale and use all other defaults; extract `output_df` in the HTML
  # context and compare to expected values
  expect_equal(
    (tbl_latex %>%
       fmt_scientific(columns = "num_1", decimals = 2, locale = "gl_ES") %>%
       render_formats_test("latex"))[["num_1"]],
    c(
      "$1,84 \\times 10^{3}$", "$2,76 \\times 10^{3}$",
      "$9,37 \\times 10^{2}$", "$6,43 \\times 10^{2}$",
      "$2,23$", "$0,00$", "$-2,32 \\times 10^{1}$")
  )
})
