Chris Bracken 538ba522ee
Move common process/IO-related mocks to mocks.dart (#14255)
Moves MockProcess, MockStdio and a few other useful mocks from
packages_test.dart to common/mocks.dart. These are useful for testing
code with interactive IO.

This adds a new constructor to MockProcess to provide additional flexibility.
2018-01-24 17:16:30 -08:00
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