tests/test-cran/test-data-structure.R

In yihui/xfun: Supporting Functions for Packages Maintained by 'Yihui Xie'

library(testit)

assert('strict_list() is really strict', {
  s_list = strict_list(aaa = 1:3, bbb = c('hey', 'mom'))
  # the class name better not be changed in the future
  (inherits(s_list, 'xfun_strict_list'))
  # `$` returns the expected value if the name provided is complete
  (s_list$aaa %==% 1:3)
  # but partial match is prohibited
  (s_list$a %==% NULL)
  # `[` will return a list - will it be better if returns a strict list?
  (inherits(s_list['aaa'], 'list'))
  # and add an element won't change the class by accident
  s_list$ccc = 4
  s_list$ddd = 'abcd'
  (inherits(s_list, 'xfun_strict_list'))
})

assert('as_strict_list() converts a list to a strict list', {
  normal_list = list(aaa = 1:3, bbb = c('hey', 'mom'))
  s_list = as_strict_list(normal_list)
  # does the strict list have the same length as the normal list?
  (length(normal_list) %==% length(s_list))
  # is the converted strict list equal to the same object created by `strict_list()`?
  s_list = strict_list(aaa = 1:3, bbb = c('hey', 'mom'))
  (as_strict_list(normal_list) %==% s_list)
})

assert('print() returns the same output for strict and normal list', {
  normal_list = list(aaa = 1:2, bbb = c('hey', 'dad'))
  s_list = as_strict_list(normal_list)
  (capture.output(print(normal_list)) %==% capture.output(print(s_list)))
})

assert('raw_string() prints as expected', {
  rs = raw_string(c('a "b"', 'hello\tworld!'))
  (inherits(rs, 'xfun_raw_string'))
  output = capture.output(rs)
  (output %==% c('a "b"', 'hello\tworld!'))
})

assert('raw_string() returns 0-length xfun_raw_string when input is NULL', {
  rs1 = raw_string(NULL)
  (inherits(rs1, 'xfun_raw_string'))
  (length(rs1) == 0)
  (capture.output(rs1) %==% character(0))

  # string 'NULL' is treated appropriately
  rs2 = raw_string('NULL')
  (inherits(rs2, 'xfun_raw_string'))
  (length(rs2) == 1)
  (capture.output(rs2) %==% 'NULL')
})

assert('raw_string() inherits from character', {
  rs = raw_string(c('a "b"', 'hello\tworld!'))
  (inherits(rs, 'character'))
})