[shared_preferences] remove testing section from README (flutter#7410)

as requested
fixes flutter#153108

Author: tarrinneal

packages/shared_preferences/shared_preferences/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 2.3.2
 
+* Removes outdated testing information from README.
 * Updates minimum supported SDK version to Flutter 3.22/Dart 3.4.
 * Updates minimum supported SDK version to Flutter 3.19/Dart 3.3.
 

packages/shared_preferences/shared_preferences/README.md

@@ -183,18 +183,6 @@ If you have been using `SharedPreferences` with the default prefix but wish to c
 to a new prefix, you will need to transform your current preferences manually to add 
 the new prefix otherwise the old preferences will be inaccessible.
 
-### Testing
-
-In tests, you can replace the standard `SharedPreferences` implementation with
-a mock implementation with initial values. This implementation is in-memory
-only, and will not persist values to the usual preference store.
-
-<?code-excerpt "readme_excerpts.dart (Tests)"?>
-```dart
-final Map<String, Object> values = <String, Object>{'counter': 1};
-SharedPreferences.setMockInitialValues(values);
-```
-
 ### Storage location by platform
 
 | Platform | SharedPreferences | SharedPreferencesAsync/WithCache |

packages/shared_preferences/shared_preferences/pubspec.yaml

@@ -3,7 +3,7 @@ description: Flutter plugin for reading and writing simple key-value pairs.
   Wraps NSUserDefaults on iOS and SharedPreferences on Android.
 repository: https://github.com/flutter/packages/tree/main/packages/shared_preferences/shared_preferences
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+shared_preferences%22
-version: 2.3.1
+version: 2.3.2
 
 environment:
   sdk: ^3.4.0