I'm writing tests for a function that under some conditions will generate warnings. I want to ensure that under the other conditions it does not produce warnings. I don't see an obvious way to easi...

I have a package with a suggested dependency enabling optional behaviour. Following the best practice, I added this dependency in my "Suggests" and check if it's installed with requireNam...

In order to develop a package, I am using testthat. I want to test if my functions send proper messages and warnings. I want to test the results of functions at the same time. This is how I am tryi...

I'm using GitHub Actions to do the R CMD Check (see https://github.com/r-lib/actions). I would like to use snapshot_file in testthat script of the sort: save_png <- function(code, width = 1000, ...

What's the best way to handle calls that generate a warning but then also return a value? e.g. > require(testthat) > expect_warning(log(-1)) > expect_equal(log(-1), NaN) Warning message:...

I've deprecated several functions in my R package by including a .Deprecated("new_function_name") line at the start of the function. I had full unit test coverage for those deprecated functions. No...

In my understanding, anything put inside test_that() should be compartmentalized, meaning that if I load a package in test_that(), its functions and methods shouldn't be available in other test_tha...

I am using the testthat package in R and I am trying to test a function defined in a file example.R. This file contains a call source("../utilities/utilities.R") where utilities.R is a file with fu...

R's testthat package has a number of functions for running tests: https://testthat.r-lib.org/reference/index.html#run-tests. However, the most coarse level you can filter tests seems to be at a fil...

I am building a package which works with data.table and which should be tested using package testthat. While the code works fine when calling from the command line, I run into issues when calling f...

tl;dr I want to run devtools::test() on a package and have it skip tests etc. as though it were running on CRAN, but I can't figure out how. As I understand it, testthat::skip_on_cran() checks for ...

Since callr::r and callr::r_bg launch a background process in a clean environment, they do not fit neatly into unit test paradigms. An R unit test, run via testthat, loads the current development v...

I am trying to mock the output of a gh API request: httptest2::with_mock_dir("gh", { test_that("api works", { gh::gh("GET /repos/r-lib/gh") }) }) I am trying to se...

I am using testthat to write unit tests for my R packages. I have seen a few package authors (like those from Rcpp and ggplot2) distributing their unit tests with the binary files. However, when I ...

I am using Hadley's testthat-based approach for automated testing of my package. With this approach, what is the most suitable place to put test data files that is files only used by the test scr...

This test in my package works fine with devtools::test(). Also the online Travis build is going well. test_that("Package style", { lintr::expect_lint_free() }) However, with devtools::c...

Is there any way to reproduce the environment which is used by devtools::check? I have the problem that my tests work with devtools::test() but fail within devtools::check(). My problem is now, ho...

I am using testthat to check the code in my package. Some of my tests are for basic functionality, such as constructors and getters. Others are for complex functionality that builds on top of the b...

I have tests for a package that check functions that may or may not return warnings, for example: test_that("test", { expect_true(is.na(log(NA))) expect_true(is.na(log(-1))) }) I am not intere...

I would like to run the package-internal tests with testthat::test_package('httr') on a specific version of a package. Is there a way to install a R package (e.g. from CRAN) with a specific version...

I'm having trouble using testthat's tolerance parameter when I check whether two data_frames are equal. Here's a simple example with two data frames: library(dplyr) library(testthat) d1 = data_fra...

I have a routine that returns a data frame. I want to check if its values are reasonable. Using testthat I have expect_equal, but I am not sure if it applies to data.frames. I tried to do this but ...

I am trying to develop unit tests for my shiny app, which was made using golem framework and shiny v1.5.0. Golem comes with a recommended test file, which covers very basic UI testing. I am, howeve...

I am looking for the easiest way to mock response of rest API within testthat framework. Example of usage would be similar to this: with_mock_api( request, response, { call_to_function_with...

(This question is also asked at Github here) After an upgrade of R to 4.0.2 tests fail because it seems, the algorithm of sort in testthat changed. The following shows, that base::sort() and browse...