Failure with dev testthat

[hadley]

I see

── ERROR (test-box_cox.R:7:3): (code run outside of `test_that()`) ─────────────
Error: `desc` must be a string
Backtrace:
    █
 1. └─testthat::test_that(...) test-box_cox.R:7:2

── ERROR (test-inv_box_cox.R:7:3): (code run outside of `test_that()`) ─────────
Error: `desc` must be a string
Backtrace:
    █
 1. └─testthat::test_that(...) test-inv_box_cox.R:7:2

because test_that() now checks that the first argument is a string.

I'm planning to submit testthat to CRAN in about a month.