library(testit)

z = new_defaults(list(a = 1))

assert(
  '$set() and $get() methods set/get values',
  identical(z$get(), list(a = 1)),
  identical({z$set(a = 2); z$get('a')}, 2),
  identical({z$set(b = 'f'); z$get(c('a', 'b'))}, list(a = 2, b = 'f'))
)

assert(
  '$merge() does not change the object but returns a list of new values',
  identical({z$merge(list(b = 'g')); z$get('b')}, 'f'),
  identical(z$merge(list(b = 'g')), list(a = 2, b = 'g'))
)

assert(
  '$get(default=TRUE) returns the initial value',
  identical(z$get(default = TRUE), list(a = 1))
)

assert(
  '$get(names) keeps the names if drop = FALSE and one or more names do not exist',
  identical(z$get(c('a', 'c')), list(a = 2, c = NULL)),
  identical(z$get('c'), NULL),
  identical(z$get('c', drop = FALSE), list(c = NULL))
)

assert('$delete() deletes keys from the list', {
  z$set(b1 = TRUE, b2 = FALSE); z$delete(c('b1', 'b2'))
  (!any(c('b1', 'b2') %in% z$get()))
})

assert(
  '$restore() restores to the initial value',
  identical({z$restore(); z$get()}, list(a = 1))
)

assert('$append() returns appended the chunk option', {
  z$set(d = 1)
  z$append(d = 2)
  identical(z$get('d'), c(1, 2))
})

z = new_defaults()

# named argument in set()
z$set(a = list(b = 2, c = 'qwer'))

assert(
  'a named argument of list in $set() method is not treated as a list of options',
  identical(length(z$get()), 1L),
  # unnamed argument in set()
  identical({z$restore(); z$set(list(b = 2, c = 'qwer')); z$get()}, list(b = 2, c = 'qwer'))
)