R 测试结果与使用 Rscript 运行测试文件不同

Question

I am new to programming in R and have come across a baffling issue with testthat and Rscript.

I have a test file, call it test.R , that contains a bunch of testthat::test_that("test_name", {testthat::expect ...}) statements. If I run Rscript test.R , or if I just paste the statements from the test into the R console and manually check that the expect would pass, everything works as expected and my tests seem to succeed.

However, if I use library(devtools); devtools::test() library(devtools); devtools::test() , there is a failing test with a subscript out of bounds error.

I haven't included any specific code because I'm not looking to try to debug the particular error, but rather hope to understand how this is possible. Would testthat be running a different version? Is there differing behaviour between Rscript and the R console compared to what testthat would run under?

Answer 1

FWIW, I experienced the same problem.

In my case, the objects created in the script were not exactly the same as those created in a test helper file, so the tests were receiving slightly different information to the script, and hence were returning different results.