test: add application cache unit test

pokedex/pubspec.yaml

@@ -34,6 +34,7 @@ dev_dependencies:
   build_runner: ^2.4.6
   freezed: ^2.4.1
   json_serializable: ^6.7.1
+  mocktail: ^1.0.4
 
 flutter:
   uses-material-design: true

pokedex/test/cache/application_cache_test.dart

@@ -0,0 +1,18 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pokedex_flutter/cache/application_cache.dart';
+
+void main() {
+  late ApplicationCache applicationCache;
+
+  setUp(() {
+    applicationCache = MemoryCacheImpl();
+  });
+
+  test(
+      'should save data '
+      'in memory', () {
+    final dynamic = {'object': 'value'};
+    applicationCache.putValue('key', dynamic);
+    expect(applicationCache.getValue('key'), dynamic);
+  });
+}