Allow removal of platform instance for testing purposes (Baseflow#41)

* Revert "Merge pull request Baseflow#35 from Baseflow/revert-34-enhancement/platform-interface"

This reverts commit 101bf12, reversing
changes made to d828355.

* Adds method to remove platform instance

Author: JeroenWeener

google_api_availability_platform_interface/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.0.1
+
+* Adds `removeInstance` to `GoogleApiAvailabilityPlatform` for testing purposes.
+
 ## 1.0.0
 
 * Extracts the common platform interface from the google_api_availability package.

google_api_availability_platform_interface/lib/src/google_api_availability_platform_interface.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/foundation.dart';
 import 'package:google_api_availability_platform_interface/google_api_availability_platform_interface.dart';
 import 'package:plugin_platform_interface/plugin_platform_interface.dart';
 
@@ -33,6 +34,13 @@ abstract class GoogleApiAvailabilityPlatform extends PlatformInterface {
     _instance = instance;
   }
 
+  /// Removes the registered instance of the [GoogleApiAvailabilityPlatform] class.
+  ///
+  /// This method is exposed for testing purposes only and should not be used by
+  /// clients of the plugin.
+  @visibleForTesting
+  static removeInstance() => _instance = null;
+
   /// Returns the connection status of Google Play Service.
   ///
   /// Optionally, you can also show an error dialog if the connection status is

google_api_availability_platform_interface/pubspec.yaml

@@ -3,7 +3,7 @@ description: A common platform interface for the google_api_availability plugin.
 repository: https://github.com/baseflow/flutter-google-api-availability/tree/main/google_api_availability_platform_interface
 # NOTE: We strongly prefer non-breaking changes, even at the expense of a
 # less-clean API. See https://flutter.dev/go/platform-interface-breaking-changes
-version: 1.0.0
+version: 1.0.1
 
 dependencies:
   flutter: