I want to simulate the no network case when using RetroFit
and MockWebServer
.
Im currently testing using Espresso
and supplying the MockWebServer
s url to the RestAdapter
before I start my tests. This works great for mocking server responses and so on but I cant see a simple way to script the java.net.ConnectException
exception thrown when a device has no network. I can see the MockResponse allows throttling simulation and so on but not a custom exception.
I know I could go the root of mocking the actual web api interface used by retrofit
but I would like to use the same approach as my other tests if possible by using MockWebServer
.
I imagine I've just missed something simple :)
Thanks
Retrofit has a retrofit-mock
module which offers a MockRestAdapter
class whose purpose is to simulate network delay and errors.
This is a used in conjunction with the normal RestAdapter
to create an instance of your service. You can see a full example in the samples/mock-github-client/
folder of the repo: https://github.com/square/retrofit/tree/parent-1.9.0/retrofit-samples/mock-github-client
MockRestAdapter
offers these APIs:
setDelay
- Set the network round trip delay, in milliseconds.setVariancePercentage
- Set the plus-or-minus variance percentage of the network round trip delay.setErrorPercentage
- Set the percentage of calls to calculateIsFailure()
that return true
.In your test, you can call setErrorPercentage(100)
to guarantee that a network error will occur. By default the amount of time for the error to be thrown is anywhere from 0 to 3x the delay. Set the delay to 0 for instant results.