linting and maintainance

test/modal_progress_hud_nsn_test.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:modal_progress_hud_nsn/modal_progress_hud_nsn.dart';
 
@@ -7,17 +6,17 @@ void main() {
   group('Modal Progress HUD', () {
     Widget sut(bool inAsyncCall, Offset? offset) {
       return MaterialApp(
-        home: new ModalProgressHUD(
+        home: ModalProgressHUD(
           inAsyncCall: inAsyncCall,
           offset: offset,
-          child: Text(''),
+          child: const Text(''),
         ),
       );
     }
 
     testWidgets('should show progress indicator when in async call',
         (tester) async {
-      final inAsyncCall = true;
+      const inAsyncCall = true;
       await tester.pumpWidget(sut(inAsyncCall, null));
 
       expect(find.byType(Text), findsOneWidget);
@@ -26,7 +25,7 @@ void main() {
 
     testWidgets('should not show progress indicator when not in async call',
         (tester) async {
-      final inAsyncCall = false;
+      const inAsyncCall = false;
       await tester.pumpWidget(sut(inAsyncCall, null));
 
       expect(find.byType(Text), findsOneWidget);
@@ -35,8 +34,8 @@ void main() {
 
     testWidgets('should allow positioning of progress indicator',
         (tester) async {
-      final inAsyncCall = true;
-      final offset = Offset(0.1, 0.1);
+      const inAsyncCall = true;
+      const offset = Offset(0.1, 0.1);
       await tester.pumpWidget(sut(inAsyncCall, offset));
 
       expect(find.byType(Positioned), findsOneWidget);
@@ -44,4 +43,4 @@ void main() {
       expect(find.byType(CircularProgressIndicator), findsOneWidget);
     });
   });
-}
+}