fix tests

packages/stream_chat_flutter/lib/src/theme/message_input_theme.dart

@@ -1,3 +1,5 @@
+import 'dart:ui';
+
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:stream_chat_flutter/src/extension.dart';
@@ -188,7 +190,7 @@ class MessageInputThemeData with Diagnosticable {
         linkHighlightColor:
             Color.lerp(a.linkHighlightColor, b.linkHighlightColor, t),
         enableSafeArea: a.enableSafeArea,
-        elevation: Tween(begin: a.elevation, end: b.elevation).transform(t),
+        elevation: lerpDouble(a.elevation, b.elevation, t),
         shadow: BoxShadow.lerp(a.shadow, b.shadow, t),
       );
 

packages/stream_chat_flutter/test/src/typing_indicator_test.dart

@@ -63,19 +63,23 @@ void main() {
                     Event(type: EventType.typingStart),
               }));
 
+      const typingKey = Key('typing');
+
       await tester.pumpWidget(MaterialApp(
         home: StreamChat(
           client: client,
           child: StreamChannel(
             channel: channel,
             child: const Scaffold(
-              body: TypingIndicator(),
+              body: TypingIndicator(
+                key: typingKey,
+              ),
             ),
           ),
         ),
       ));
 
-      expect(find.byKey(const Key('typings')), findsOneWidget);
+      expect(find.byKey(typingKey), findsOneWidget);
     },
   );
 }