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googletest/coroutines/docs/testing-with-two-computers.md
John Graley f5b9a9239c
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Testing With Two Computers

This is a simplified overview of conventional and coroutine-based unit testing. We explore the steps taken by a convnetional test and then present the same test in a coroutine model. We use an analogy with computers that can "only do one thing at a time" and then discuss how coroutines fit in at the end.

Conventional testing, using one computer

For this exercise, we will assume that the computers illustrated can only run a single "program" at a time (but see footnote). My test case makes a checklist of events that I will expect during the test. Text after I am starting the code-under-test, with an injected dependancy back to me. Text after I received a call on the injected dependency. Thinks: I can't just let my test case continue here. I will use the checklist to find out whether it is correct. Text after The call was correct! Now the checklist tells me how to respond to the call. Text after The code-under-test has completed and I check its output. Test passed!

The same test, using two computers

I say "please start the code-under-test". I start the code and inject dependency back to me. Text after I say "I received this mock call". Inside my test case, I check that the call is correct. Text after The call was correct! I say "please return this value". I return the mock call. Text after I say "the code-under-test has completed and here is its output". I check the output. Test passed! Text after

How do we get to coroutines

Footnote

The machine shown is a PDP-11/35 minicomputer system which does in fact support timesharing. You would not need two of them to run cotest!