Refactor generate_localizations_test.dart (#128974)

The file was becoming harder to deal with as it manually sets up a /lib/l10n directory with a `MemoryFileSystem` in every single test. This PR wraps this process in a helper function `setupLocalizations` and also provides a helper function `getGeneratedFileContent` which helps fetch the respective output file given the locale string.

Refactor generate_localizations_test.dart (#128974)
The file was becoming harder to deal with as it manually sets up a /lib/l10n directory with a `MemoryFileSystem` in every single test. This PR wraps this process in a helper function `setupLocalizations` and also provides a helper function `getGeneratedFileContent` which helps fetch the respective output file given the locale string.
48ba9c41 · Tae Hyung Kim · GitHub · e5ec07ba · 48ba9c41
Unverified Commit 48ba9c41 authored Jun 20, 2023 by Tae Hyung Kim Committed by GitHub Jun 20, 2023
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generate_localizations_test.dart ...tools/test/general.shard/generate_localizations_test.dart +436 -1375

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--- a/packages/flutter_tools/test/general.shard/generate_localizations_test.dart
+++ b/packages/flutter_tools/test/general.shard/generate_localizations_test.dart