What are some strategies for unit testing workflows in WF 4?

Question

I've done quite a bit of WF development using 3.5 over the last few years, but am just now ramping up on WF in 4.0. I have a TDD bent, and while WF 3.5 was difficult at times to unit test, I'm wondering if anyone could share their strategy for unit testing workflows in WF 4 and/or point me to resources that would help get me started?

Answer 1

The easiest approach is, just like in WF35, to separate the implementation from the activity so they can be tested independently of each other. The activity extension is just a regular class so use whatever you are comfortable with. Most activities can be unit tested quite easily using the WorklfowInvoker.

Answer 2

I completely agree with Maurice on testing activities independently. For unit testing workflow services, there is now Microsoft.Activities.UnitTesting. Download from the CodePlex page.