tests/testthat/test_error_handling.R

In yihui/tikzDevice: R Graphics Output in LaTeX Format

context("Test tikzDevice error and warning messages")

test_that("Null device is not a tikzDevice", {
  expect_false(
    suppressMessages(isTikzDevice())
  )
})

test_that("Device produces an error for unescaped characters", {
  expect_that(
    suppressMessages(getLatexStrWidth("_")),
    throws_error("TeX was unable to calculate metrics")
  )
})

test_that("Device warns about the lower bound of the ASCII table when using pdftex", {
  expect_that(
    getLatexCharMetrics(31, engine = "pdftex"),
    gives_warning("pdftex can only generate metrics for character codes between 32 and 126!")
  )
})

test_that("Device warns about the upper bound of the ASCII table when using pdftex", {
  expect_that(
    getLatexCharMetrics(127),
    gives_warning("pdftex can only generate metrics for character codes between 32 and 126!")
  )
})

test_that("Device won't accept non-numeric ASCII codes", {
  expect_that(
    suppressMessages(getLatexCharMetrics("a")),
    gives_warning("getLatexCharMetrics only accepts integers!")
  )
})

test_that("Device throws error when a path cannot be opened", {
  expect_that(
    tikz("/why/would/you/have/a/path/like/this.tex"),
    throws_error("directory does not exist or is not writable")
  )
})

test_that("tikzAnnotate refuses to work with a non-tikzDevice", {
  expect_that(
    tikzAnnotate("test"),
    throws_error("The active device is not a tikz device")
  )
})

test_that("XeTeX warns about unrecognized UTF8 characters", {
  expect_that(
    suppressMessages(getLatexStrWidth("α", engine = "xetex")),
    gives_warning("XeLaTeX was unable to calculate metrics")
  )
})

test_that("tikzNode warns about more than one X coordinate value", {
  tikz()
  plot.new()
  on.exit(dev.off())

  expect_that(
    tikzCoord(c(1, 2), 2, "test"),
    gives_warning("More than one X coordinate specified")
  )
})

test_that("tikzNode warns about more than one Y coordinate value", {
  tikz()
  plot.new()
  on.exit(dev.off())

  expect_that(
    tikzCoord(1, c(1, 2), "test"),
    gives_warning("More than one Y coordinate specified")
  )
})

test_that("symbolicColors warns about wrong filename", {
  tikz(symbolicColors = T, colorFileName = "/")
  plot(1, 2, axes = F, xlab = "", ylab = "")

  expect_that(
    dev.off(),
    gives_warning("Color definition file could not be opened and is missing")
  )
})

test_that("symbolicColors warns about too many colors", {
  tikz(symbolicColors = T, maxSymbolicColors = 2)
  plot.new()
  points(0, 0)
  on.exit(dev.off())
  expect_that(
    points(0, 1, col = "red"),
    gives_warning("Too many colors used, reverting to non-symbolic storage")
  )
})

test_that("check that maxSymbolicColors is nonnegative", {
  expect_that(
    tikz(symbolicColors = T, maxSymbolicColors = -1),
    throws_error("maxSymbolicColors needs to be nonnegative")
  )
})