uiTest test helper throws time for infinitely animating widgets

[aeruhxi]

Problem

uiTest relies on pumpAndSettle internally, which never settles for an infinitely animating widget like CircularProgressIndicator, and throws after a timeout.

Possible Solution

Allow an option to use pump with a particular duration in uiTest.

[sarbagyastha]

Thanks for reporting the issue. Yes, the pumpAndSettle shouldn't have been done internally.