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coroutines/docs/testing-with-two-computers.md
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# Heading
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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](##Footnote)).
![My test case makes a checklist of events that I will expect during the test.](/coroutines/docs/images/current_1.png)
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![I am starting the code-under-test, with an injected dependancy back to me.](/coroutines/docs/images/current_2.png)
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![The call was correct! Now the checklist tells me how to respond to the call.](/coroutines/docs/images/current_4.png)
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![The code-under-test has completed and I check its output. Test passed!](/coroutines/docs/images/current_5.png)
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## The same test, using two computers
![I say "please start the code-under-test". I start the code and inject dependency back to me.](/coroutines/docs/images/cotest_1.png)
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![I say "I received this mock call". Inside my test case, I check that the call is correct.](/coroutines/docs/images/cotest_2.png)
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![I say "the code-under-test has completed and here is its output". I check the output. Test passed!](/coroutines/docs/images/cotest_4.png)
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## 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!