feat: add test for bottom sheet

+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:get/get.dart';
+
+import 'util/wrapper.dart';
+
+void main() {
+  testWidgets("Get.bottomSheet smoke test", (tester) async {
+    await tester.pumpWidget(
+      Wrapper(child: Container()),
+    );
+
+    Get.bottomSheet(Container(
+      child: Wrap(
+        children: <Widget>[
+          ListTile(
+              leading: Icon(Icons.music_note),
+              title: Text('Music'),
+              onTap: () => {}),
+        ],
+      ),
+    ));
+
+    await tester.pumpAndSettle();
+
+    expect(find.byIcon(Icons.music_note), findsOneWidget);
+  });
+}