tests/testthat/test-icycle.r

context("icycle iterator")

test_that("Indefinite icycle of integer sequence", {
  it <- icycle(1:3)

  expect_equal(nextElem(it), 1)
  expect_equal(nextElem(it), 2)
  expect_equal(nextElem(it), 3)

  expect_equal(nextElem(it), 1)
  expect_equal(nextElem(it), 2)
  expect_equal(nextElem(it), 3)

  expect_equal(nextElem(it), 1)
})

test_that("icycle repeats integer fixed number of times", {
  it <- icycle(1:3, times=2)

  expect_equal(nextElem(it), 1)
  expect_equal(nextElem(it), 2)
  expect_equal(nextElem(it), 3)

  expect_equal(nextElem(it), 1)
  expect_equal(nextElem(it), 2)
  expect_equal(nextElem(it), 3)

  expect_error(nextElem(it), "StopIteration")
})


test_that("icycle repeats indefinitely for a function", {
  it <- icycle(function() rnorm(1))

  set.seed(1)
  i <- nextElem(it)
  set.seed(1)
  expect_equal(i, rnorm(1))

  set.seed(2)
  i <- nextElem(it)
  set.seed(2)
  expect_equal(i, rnorm(1))

  set.seed(3)
  i <- nextElem(it)
  set.seed(3)
  expect_equal(i, rnorm(1))
})

test_that("icycle repeats a fixed number of times for a function", {
  it <- icycle(function() rnorm(1), times=3)

  set.seed(1)
  i <- nextElem(it)
  set.seed(1)
  expect_equal(i, rnorm(1))

  set.seed(2)
  i <- nextElem(it)
  set.seed(2)
  expect_equal(i, rnorm(1))

  set.seed(3)
  i <- nextElem(it)
  set.seed(3)
  expect_equal(i, rnorm(1))

  expect_error(nextElem(it), "StopIteration")
})

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itertools2 documentation built on May 30, 2017, 7:17 a.m.