Chinmay Garde 2866095b58 Setup a Metal test surface and add a new unit-test target that tests the testing utilities.
`//flutter/testing` now contains a lot of utilities used by other test targets.
This includes stuff like working with render targets that use either OpenGL or
Metal, fixtures for interacting with the Dart VM, test assertion predicates,
etc.. However, these utilities themselves are not tested as part of a standalone
test suite. Instead, only the test targets that include it exercise these
utilities. Since these are no longer trivial, a new test target has been added
that tests the testing utilities directly.
2019-11-22 23:03:34 -08:00
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