February 2016
Intermediate to advanced
232 pages
4h 39m
Japanese
Content preview from Rパッケージ開発入門 ―テスト、文書化、コード共有の手法を学ぶ
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84
equal to var_dunif(0, 10)
の部分）が表示されます。ゴールはすべてのテストを成功させること
です。
7.2
テストの
テストのファイルは
tests/testthat
以下にあります。テストファイルのファイル名は
test
で
始める必要があります。
stringr
パッケージのテストファイルの例を見てみましょう。
library(stringr)
context("String length")
test_that("str_length is number of characters", {
expect_equal(str_length("a"), 1)
expect_equal(str_length("ab"), 2)
expect_equal(str_length("abc"), 3)
})
test_that("str_length of factor is length of level", {
expect_equal(str_length(factor("a")), 1)
expect_equal(str_length(factor("ab")), 2)
expect_equal(str_length(factor("abc")), 3)
})
test_that("str_length of missing is missing", {
expect_equal(str_length(NA), NA_integer_)
expect_equal(str_length(c(NA, ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.