test: added tests for extensions

test/leaderboard/view/leaderboard_page_test.dart

@@ -2,6 +2,7 @@
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:leaderboard_repository/leaderboard_repository.dart';
 import 'package:mockingjay/mockingjay.dart';
 import 'package:pinball/l10n/l10n.dart';
 import 'package:pinball/leaderboard/view/leaderboard_page.dart';
@@ -78,4 +79,40 @@ void main() {
       verify(() => navigator.push<void>(any())).called(1);
     });
   });
+
+  group('CharacterTypeX', () {
+    test('converts CharacterType.android to AndroidTheme', () {
+      expect(CharacterType.android.theme, equals(AndroidTheme()));
+    });
+
+    test('converts CharacterType.dash to DashTheme', () {
+      expect(CharacterType.dash.theme, equals(DashTheme()));
+    });
+
+    test('converts CharacterType.dino to DinoTheme', () {
+      expect(CharacterType.dino.theme, equals(DinoTheme()));
+    });
+
+    test('converts CharacterType.sparky to SparkyTheme', () {
+      expect(CharacterType.sparky.theme, equals(SparkyTheme()));
+    });
+  });
+
+  group('CharacterThemeX', () {
+    test('converts AndroidTheme to CharacterType.android', () {
+      expect(AndroidTheme().toType, equals(CharacterType.android));
+    });
+
+    test('converts DashTheme to CharacterType.dash', () {
+      expect(DashTheme().toType, equals(CharacterType.dash));
+    });
+
+    test('converts DinoTheme to CharacterType.dino', () {
+      expect(DinoTheme().toType, equals(CharacterType.dino));
+    });
+
+    test('converts SparkyTheme to CharacterType.sparky', () {
+      expect(SparkyTheme().toType, equals(CharacterType.sparky));
+    });
+  });
 }