fix tests

Author: tarrinneal

packages/shared_preferences/shared_preferences_platform_interface/lib/shared_preferences_platform_interface.dart

@@ -124,6 +124,15 @@ class InMemorySharedPreferencesStore extends SharedPreferencesStorePlatform {
     );
   }
 
+  @override
+  Future<bool> clearWithPrefix(String prefix) async {
+    return clearWithParameters(
+      ClearParameters(
+        filter: PreferencesFilter(prefix: prefix),
+      ),
+    );
+  }
+
   @override
   Future<bool> clearWithParameters(ClearParameters parameters) async {
     final PreferencesFilter filter = parameters.filter;
@@ -145,6 +154,15 @@ class InMemorySharedPreferencesStore extends SharedPreferencesStorePlatform {
     );
   }
 
+  @override
+  Future<Map<String, Object>> getAllWithPrefix(String prefix) async {
+    return getAllWithParameters(
+      GetAllParameters(
+        filter: PreferencesFilter(prefix: prefix),
+      ),
+    );
+  }
+
   @override
   Future<Map<String, Object>> getAllWithParameters(
       GetAllParameters parameters) async {