Testthat: FR: Run tests in parallel

[krlmlr]

to speed up TDD.

• One task per context
• Need special care to avoid mixing output
  
  
  
  • Can be achieved by making reporter$cat() collect all output and print it in reporter$.end_context()
  
  
• Can use the "parallel" package for simplicity
  
  
  
  • Some backends need to load the package and the helpers on each node
  
  

[russellpierce]

Just a thought: Being able to opt out for some tests might be good.(unless testthat is only intended for use with unit tests and excludes integration tests)

[gwarnes-mdsol]

It would be important to allow some tests to "opt-out" of parallel testing, such as those that are already using parallelism internally.

[jeffpollock9]

Hi, what needs to be done to get this (or similar) accepted? I think it would be a great addition.