tests/testthat/test-keypress.R

In r-lib/cli: Helpers for Developing Command Line Interfaces

test_that("control characaters", {
  skip_on_cran()
  p <- r_pty()

  expect_snapshot(
    for (code in c(1:2, 4:6, 8:14, 16L, 20L, 21L, 23L, 27L, 127L)) {
      p$write_input("cli::keypress()\n")
      Sys.sleep(0.1)
      p$write_input(as.raw(code))
      p$poll_io(1000)
      cat(p$read_output())
    }
  )
})

test_that("write ahead", {
  skip_on_cran()
  p <- r_pty()
  expect_snapshot({
    p$write_input("{ Sys.sleep(0.5); cli::keypress() }\nX")
    p$poll_io(1000)
    cat(p$read_output())
  })
})

test_that("arrows, etc", {
  skip_on_cran()
  p <- r_pty()
  keys <- paste0("\033", c(
    "[A", "[C", "[D", "[F", "[H", "-",
    "OA", "OB", "OC", "OD", "OF", "OH", "-",
    "[1~", "[2~", "[3~", "[4~", "[5~", "[6~", "-",
    "[[5~", "[[6~", "-",
    "[[7~", "[[8~", "-",
    "OP", "OQ", "OR", "OS", "-",
    "[15~", "[17~", "[18~", "[19~", "[20~", "[21~", "[23~", "[24~", "-",
    "[11~", "[12~", "[13~", "[14~", "-",
    ""
  ))
  keys[keys == "\033-"] <- "-"
  expect_snapshot({
    for (key in keys) {
      p$write_input("cli::keypress()\n")
      p$write_input(key)
      p$poll_io(1000)
      cat(p$read_output())
    }
  })
})

test_that("nonblocking", {
  skip_on_cran()
  p <- r_pty()
  expect_snapshot({
    p$write_input("cli::keypress(block = FALSE)\n")
    p$poll_io(1000)
    cat(p$read_output())
  })
  expect_snapshot({
    p$write_input("{ Sys.sleep(0.5); cli::keypress() }\nX")
    p$poll_io(1000)
    cat(p$read_output())
  })
})