The flutter_tools test suite should pass on local development devices. However, running dart test in //flutter/packages/flutter_tools will generally lead to hundreds of failures. Especially the unit test in the general.shard and commands.shard/hermetic should be hermetic and not dependent on the environment that they are run in. These tests that pass on CI but fail locally are most likely leaking the environment state, and only coincidentally pass on CI because the environment state is correct. These tests should be updated to fake out the real environment so that the tests are reproducible locally (integration tests will always have dependencies on the system they run on).

This is an umbrella tracking issue for PRs that fix individual tests.

As part of this, we should also remove all instances of @Tags(<string>['no-shuffle']) from the test suite (see #85160)

edits by @andrewkolos:

• [tool] make testUsingContext provide a Stdio (with hasTerminal unset) override by default #151357