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@krispypen nice catch! Can you add a test for this? You can add it to this file: https://github.com/christopherfujino/flutter/blob/pub-bat-show-dir/packages/flutter_tools/test/commands.shard/hermetic/generate_localizations_test.dart and it can be as simple as asserting that GenerateLocalizationsCommand(...).usage has the right string.

Closing this as inactive. Feel free to re-open if you want to revisit (and address feedback).