auto_test gives reporter error in testthat - r

Question

I'm trying to force myself to do more unit testing on some data analysis projects where I don't really want to develop a package. So, I've been playing with the testthat R package. I have a code folder and inside it is a src and a test folder. In the src folder I have the file add.R that has this function:
add <- function(x,y){
x+y
}
In the test folder I have the file test-add.R that contains this:
library(testthat)
test_that("adding numbers", {
expect_equal(add(2,3), 5)
expect_equal(add(5,5), 10)
})
The following works fine...
> source('code/src/add.R')
> test_file('code/test/test-add.R')
But I'd like to be able to use the auto_test function since as the project grows source/test_file will get tedious. But when I try auto_test I get this...
> auto_test('code/src', 'code/test')
Error in find_reporter(reporter) : attempt to apply non-function
I'm sure I'm missing something simple, but what?
> sessionInfo()
R version 3.2.3 (2015-12-10)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.11.1 (El Capitan)
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] testthat_0.11.0.9000 knitr_1.12.3
loaded via a namespace (and not attached):
[1] lazyeval_0.1.10 R6_2.1.2 tools_3.2.3
[4] withr_1.0.1 memoise_1.0.0 crayon_1.3.1
[7] digest_0.6.9 devtools_1.10.0.9000

Answer 1

It seems that this is a problem of testthat version 0.11.0.9000. If I install this version from github, I get the same error message as you do:
auto_test('code/src', 'code/test')
## Error in find_reporter(reporter) : attempt to apply non-function
But with version 0.11.0 that can be installed from CRAN, your example runs fine:
auto_test('code/src', 'code/test')
## ..
## DONE