How to start a new package with testing in r

From RStudio

# This post is written this way so you can copy and paste into a

# new file in RStudio and hit Run line-by-line. Edit as necessary.

# Navigate where you want your folder to be located


# Assumes usethis is installed


# R will try to put you into the new project 'chief'.

# If you don't move to the new project, continue with setwd below.

# Add a test environment

setwd("chief") # not necessary if you moved to the project


# Add your first test function to at least get something in that folder.

# Go to chief\tests\testthat

# and add this file with name test_chief.R


test_that("I'm testing something", {

  # do something with your code

  expect_equal(1:4, 1:4) # this surely will pass the test


# If you want to add a vignette, you can follow along at this Hadley site


# which is slightly out of date but should still work despite whatever

# deprecation warnings you may get -- the affordable, IMO, cost of 

# Hadley's rapid evolution approach to code development.

# ... with a straggling "recursive" deprecation as of 7/2/2019:


# After writing a function with roxygen comments, roxygenize your package


# Then click "Check" under RStudio's Build tab

# You may get a warning about "Non-standard license specification".

# To clean that up, see below.

# Next steps: 

# Write more code and re-roxygenize before re-Checking.

# Repeat until all your tests pass and your package checks out clean.

# Once no errors, click "Install and Restart" and your package is done.

You're Done!

# Don't forget!

# The only thing roxygen doesn't handle is, 

# whenever you add new functionality from another package, 

# you have have to change DESCRIPTION.


Assuming you just go GPL 


Replace "What license it uses" with

GPL-3 | file LICENSE

and put a file named LICENSE in the same directory as DESCRIPTION.

For me, this file content sufficed

"Something about GPL"

but the GNU community would probably prefer you used the one here