Switches `java-test` to the new base command that handles the boilerplate of looping over target packages.
Includes test improvements:
- Adds failure tests; previously no failure cases were covered.
- Captures output so test output isn't spammed with command output.
Part of flutter/flutter#83413
Rather than taking a list of list of path elements, just accept a list
of Posix-style paths. In practice, the API was already being partially
used that way.
Eliminates the global test filesystem and global test packages directory, in favor of local versions. This guarantees that each test runs with a clean filesystem state, rather than relying on cleanup. It also simplifies understanding the tests, since everything is done via params and return values instead of needing to know about the magic global variables and which methods mutate them.
- Replaces most explicit use of `fileSystem` with path construction using the `child*` utility methods
- Removes explicit passing of a filesystem to the commands; we're already passing a `Directory` for the
root where the tool operates, and we should never be using a different filesystem than that directory's
filesystem, so passing it was both redundant, and a potential source of test bugs.
- Updates dependencies to null-safe versions
- Migrates common.dart (which doesn't depend on anything)
- Migrates common_tests.dart and its one dependency, utils.dart
- Adds build_runner for Mockito mock generation
- Adds a new utility methods for getting arguments that handle both the casting and the removal of nullability to address a common problematic pattern while migrating code.
- Converts all files, not just the migrated ones, to those new helpers.
Migrating common.dart and utils.dart should unblock a command-by-command migration to null safety.
Reverts the separate of podspect lints into a step that doesn't do a Flutter upgrade
(https://github.com/flutter/plugins/pull/3700) because without that step we had a
version of Dart too old to run null-safe tooling.
First step of https://github.com/flutter/flutter/issues/81912
Removes the legacy analysis options override and fixes all resulting issues. This is a combination of dart fix and manual changes (mostly mechanical, but some small restructuring to address warnings more cleanly, such as creating typed structs from args when they are used repeatedly to avoid repeated casting, or making things that were unnecessarily public private).
One small opportunistic extra cleanup is that the handling of null-safety prerelease versions is removed, as any new plugin would be written null-safe from the start, so we no longer need to allow those versions.
Part of flutter/flutter#76229
