add extension_test.dart, serializer_test.dart and utils_test.dart

packages/stream_chat/lib/src/core/models/attachment.dart

@@ -4,7 +4,7 @@ import 'package:equatable/equatable.dart';
 import 'package:json_annotation/json_annotation.dart';
 import 'package:stream_chat/src/core/models/action.dart';
 import 'package:stream_chat/src/core/models/attachment_file.dart';
-import 'package:stream_chat/src/core/util/serialization.dart';
+import 'package:stream_chat/src/core/util/serializer.dart';
 import 'package:uuid/uuid.dart';
 
 part 'attachment.g.dart';
@@ -49,11 +49,11 @@ class Attachment extends Equatable {
   /// Create a new instance from a json
   factory Attachment.fromJson(Map<String, dynamic> json) =>
       _$AttachmentFromJson(
-          Serialization.moveToExtraDataFromRoot(json, topLevelFields));
+          Serializer.moveToExtraDataFromRoot(json, topLevelFields));
 
   /// Create a new instance from a db data
   factory Attachment.fromData(Map<String, dynamic> json) =>
-      _$AttachmentFromJson(Serialization.moveToExtraDataFromRoot(
+      _$AttachmentFromJson(Serializer.moveToExtraDataFromRoot(
           json, topLevelFields + dbSpecificTopLevelFields));
 
   ///The attachment type based on the URL resource. This can be: audio,
@@ -122,7 +122,7 @@ class Attachment extends Equatable {
   final String id;
 
   /// Known top level fields.
-  /// Useful for [Serialization] methods.
+  /// Useful for [Serializer] methods.
   static const topLevelFields = [
     'type',
     'title_link',
@@ -145,7 +145,7 @@ class Attachment extends Equatable {
   ];
 
   /// Known db specific top level fields.
-  /// Useful for [Serialization] methods.
+  /// Useful for [Serializer] methods.
   static const dbSpecificTopLevelFields = [
     'id',
     'upload_state',
@@ -154,12 +154,12 @@ class Attachment extends Equatable {
 
   /// Serialize to json
   Map<String, dynamic> toJson() =>
-      Serialization.moveFromExtraDataToRoot(_$AttachmentToJson(this))
+      Serializer.moveFromExtraDataToRoot(_$AttachmentToJson(this))
         ..removeWhere((key, value) => dbSpecificTopLevelFields.contains(key));
 
   /// Serialize to db data
   Map<String, dynamic> toData() =>
-      Serialization.moveFromExtraDataToRoot(_$AttachmentToJson(this));
+      Serializer.moveFromExtraDataToRoot(_$AttachmentToJson(this));
 
   Attachment copyWith({
     String? id,

packages/stream_chat/lib/src/core/models/channel_model.dart

@@ -1,6 +1,6 @@
 import 'package:json_annotation/json_annotation.dart';
 import 'package:stream_chat/src/core/models/channel_config.dart';
-import 'package:stream_chat/src/core/util/serialization.dart';
+import 'package:stream_chat/src/core/util/serializer.dart';
 import 'package:stream_chat/src/core/models/user.dart';
 
 part 'channel_model.g.dart';
@@ -37,7 +37,7 @@ class ChannelModel {
   /// Create a new instance from a json
   factory ChannelModel.fromJson(Map<String, dynamic> json) =>
       _$ChannelModelFromJson(
-          Serialization.moveToExtraDataFromRoot(json, topLevelFields));
+          Serializer.moveToExtraDataFromRoot(json, topLevelFields));
 
   /// The id of this channel
   final String id;
@@ -46,15 +46,15 @@ class ChannelModel {
   final String type;
 
   /// The cid of this channel
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final String cid;
 
   /// The channel configuration data
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final ChannelConfig config;
 
   /// The user that created this channel
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final User? createdBy;
 
   /// True if this channel is frozen
@@ -62,24 +62,24 @@ class ChannelModel {
   final bool frozen;
 
   /// The date of the last message
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime? lastMessageAt;
 
   /// The date of channel creation
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime createdAt;
 
   /// The date of the last channel update
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime updatedAt;
 
   /// The date of channel deletion
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime? deletedAt;
 
   /// The count of this channel members
   @JsonKey(
-      includeIfNull: false, toJson: Serialization.readOnly, defaultValue: 0)
+      includeIfNull: false, toJson: Serializer.readOnly, defaultValue: 0)
   final int memberCount;
 
   /// Map of custom channel extraData
@@ -90,11 +90,11 @@ class ChannelModel {
   final Map<String, Object?> extraData;
 
   /// The team the channel belongs to
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final String? team;
 
   /// Known top level fields.
-  /// Useful for [Serialization] methods.
+  /// Useful for [Serializer] methods.
   static const topLevelFields = [
     'id',
     'type',
@@ -115,7 +115,7 @@ class ChannelModel {
       extraData.containsKey('name') ? extraData['name']! as String : cid;
 
   /// Serialize to json
-  Map<String, dynamic> toJson() => Serialization.moveFromExtraDataToRoot(
+  Map<String, dynamic> toJson() => Serializer.moveFromExtraDataToRoot(
         _$ChannelModelToJson(this),
       );
 

packages/stream_chat/lib/src/core/models/event.dart

@@ -1,7 +1,7 @@
 import 'package:json_annotation/json_annotation.dart';
 import 'package:stream_chat/src/core/models/channel_model.dart';
 import 'package:stream_chat/src/core/models/message.dart';
-import 'package:stream_chat/src/core/util/serialization.dart';
+import 'package:stream_chat/src/core/util/serializer.dart';
 import 'package:stream_chat/stream_chat.dart';
 
 part 'event.g.dart';
@@ -33,7 +33,7 @@ class Event {
 
   /// Create a new instance from a json
   factory Event.fromJson(Map<String, dynamic> json) =>
-      _$EventFromJson(Serialization.moveToExtraDataFromRoot(
+      _$EventFromJson(Serializer.moveToExtraDataFromRoot(
         json,
         topLevelFields,
       ));
@@ -96,7 +96,7 @@ class Event {
   final Map<String, Object?> extraData;
 
   /// Known top level fields.
-  /// Useful for [Serialization] methods.
+  /// Useful for [Serializer] methods.
   static final topLevelFields = [
     'type',
     'cid',
@@ -118,7 +118,7 @@ class Event {
   ];
 
   /// Serialize to json
-  Map<String, dynamic> toJson() => Serialization.moveFromExtraDataToRoot(
+  Map<String, dynamic> toJson() => Serializer.moveFromExtraDataToRoot(
         _$EventToJson(this),
       );
 
@@ -198,7 +198,7 @@ class EventChannel extends ChannelModel {
 
   /// Create a new instance from a json
   factory EventChannel.fromJson(Map<String, dynamic> json) =>
-      _$EventChannelFromJson(Serialization.moveToExtraDataFromRoot(
+      _$EventChannelFromJson(Serializer.moveToExtraDataFromRoot(
         json,
         topLevelFields,
       ));
@@ -207,7 +207,7 @@ class EventChannel extends ChannelModel {
   final List<Member>? members;
 
   /// Known top level fields.
-  /// Useful for [Serialization] methods.
+  /// Useful for [Serializer] methods.
   static final topLevelFields = [
     'members',
     ...ChannelModel.topLevelFields,
@@ -215,7 +215,7 @@ class EventChannel extends ChannelModel {
 
   /// Serialize to json
   @override
-  Map<String, dynamic> toJson() => Serialization.moveFromExtraDataToRoot(
+  Map<String, dynamic> toJson() => Serializer.moveFromExtraDataToRoot(
         _$EventChannelToJson(this),
       );
 }

packages/stream_chat/lib/src/core/models/message.dart

@@ -2,7 +2,7 @@ import 'package:equatable/equatable.dart';
 import 'package:json_annotation/json_annotation.dart';
 import 'package:stream_chat/src/core/models/attachment.dart';
 import 'package:stream_chat/src/core/models/reaction.dart';
-import 'package:stream_chat/src/core/util/serialization.dart';
+import 'package:stream_chat/src/core/util/serializer.dart';
 import 'package:stream_chat/src/core/models/user.dart';
 import 'package:uuid/uuid.dart';
 
@@ -81,7 +81,7 @@ class Message extends Equatable {
 
   /// Create a new instance from a json
   factory Message.fromJson(Map<String, dynamic> json) => _$MessageFromJson(
-      Serialization.moveToExtraDataFromRoot(json, topLevelFields));
+      Serializer.moveToExtraDataFromRoot(json, topLevelFields));
 
   /// The message ID. This is either created by Stream or set client side when
   /// the message is added.
@@ -97,7 +97,7 @@ class Message extends Equatable {
   /// The message type
   @JsonKey(
     includeIfNull: false,
-    toJson: Serialization.readOnly,
+    toJson: Serializer.readOnly,
     defaultValue: 'regular',
   )
   final String type;
@@ -118,37 +118,37 @@ class Message extends Equatable {
   final List<User> mentionedUsers;
 
   /// A map describing the count of number of every reaction
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final Map<String, int>? reactionCounts;
 
   /// A map describing the count of score of every reaction
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final Map<String, int>? reactionScores;
 
   /// The latest reactions to the message created by any user.
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final List<Reaction>? latestReactions;
 
   /// The reactions added to the message by the current user.
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final List<Reaction>? ownReactions;
 
   /// The ID of the parent message, if the message is a thread reply.
   final String? parentId;
 
   /// A quoted reply message
-  @JsonKey(toJson: Serialization.readOnly)
+  @JsonKey(toJson: Serializer.readOnly)
   final Message? quotedMessage;
 
   /// The ID of the quoted message, if the message is a quoted reply.
   final String? quotedMessageId;
 
   /// Reserved field indicating the number of replies for this message.
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final int? replyCount;
 
   /// Reserved field indicating the thread participants for this message.
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final List<User>? threadParticipants;
 
   /// Check if this message needs to show in the channel.
@@ -165,25 +165,25 @@ class Message extends Equatable {
   /// If true the message is shadowed
   @JsonKey(
     includeIfNull: false,
-    toJson: Serialization.readOnly,
+    toJson: Serializer.readOnly,
     defaultValue: false,
   )
   final bool shadowed;
 
   /// A used command name.
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final String? command;
 
   /// Reserved field indicating when the message was created.
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime createdAt;
 
   /// Reserved field indicating when the message was updated last time.
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime updatedAt;
 
   /// User who sent the message
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final User? user;
 
   /// If true the message is pinned
@@ -191,7 +191,7 @@ class Message extends Equatable {
   final bool pinned;
 
   /// Reserved field indicating when the message was pinned
-  @JsonKey(toJson: Serialization.readOnly)
+  @JsonKey(toJson: Serializer.readOnly)
   final DateTime? pinnedAt;
 
   /// Reserved field indicating when the message will expire
@@ -200,7 +200,7 @@ class Message extends Equatable {
   final DateTime? pinExpires;
 
   /// Reserved field indicating who pinned the message
-  @JsonKey(toJson: Serialization.readOnly)
+  @JsonKey(toJson: Serializer.readOnly)
   final User? pinnedBy;
 
   /// Message custom extraData
@@ -220,11 +220,11 @@ class Message extends Equatable {
   bool get isEphemeral => type == 'ephemeral';
 
   /// Reserved field indicating when the message was deleted.
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime? deletedAt;
 
   /// Known top level fields.
-  /// Useful for [Serialization] methods.
+  /// Useful for [Serializer] methods.
   static const topLevelFields = [
     'id',
     'text',
@@ -257,7 +257,7 @@ class Message extends Equatable {
   ];
 
   /// Serialize to json
-  Map<String, dynamic> toJson() => Serialization.moveFromExtraDataToRoot(
+  Map<String, dynamic> toJson() => Serializer.moveFromExtraDataToRoot(
         _$MessageToJson(this),
       );
 
@@ -412,14 +412,14 @@ class TranslatedMessage extends Message {
   /// Create a new instance from a json
   factory TranslatedMessage.fromJson(Map<String, dynamic> json) =>
       _$TranslatedMessageFromJson(
-        Serialization.moveToExtraDataFromRoot(json, topLevelFields),
+        Serializer.moveToExtraDataFromRoot(json, topLevelFields),
       );
 
   /// A Map of
   final Map<String, String>? i18n;
 
   /// Known top level fields.
-  /// Useful for [Serialization] methods.
+  /// Useful for [Serializer] methods.
   static final topLevelFields = [
     'i18n',
     ...Message.topLevelFields,
@@ -427,7 +427,7 @@ class TranslatedMessage extends Message {
 
   /// Serialize to json
   @override
-  Map<String, dynamic> toJson() => Serialization.moveFromExtraDataToRoot(
+  Map<String, dynamic> toJson() => Serializer.moveFromExtraDataToRoot(
         _$TranslatedMessageToJson(this),
       );
 }

packages/stream_chat/lib/src/core/models/mute.dart

@@ -1,6 +1,6 @@
 import 'package:json_annotation/json_annotation.dart';
 import 'package:stream_chat/src/core/models/channel_model.dart';
-import 'package:stream_chat/src/core/util/serialization.dart';
+import 'package:stream_chat/src/core/util/serializer.dart';
 import 'package:stream_chat/src/core/models/user.dart';
 
 part 'mute.g.dart';
@@ -20,19 +20,19 @@ class Mute {
   factory Mute.fromJson(Map<String, dynamic> json) => _$MuteFromJson(json);
 
   /// The user that performed the muting action
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final User user;
 
   /// The target user
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final ChannelModel channel;
 
   /// The date in which the use was muted
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime createdAt;
 
   /// The date of the last update
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime updatedAt;
 
   /// Serialize to json

packages/stream_chat/lib/src/core/models/own_user.dart

@@ -1,7 +1,7 @@
 import 'package:json_annotation/json_annotation.dart';
 import 'package:stream_chat/src/core/models/device.dart';
 import 'package:stream_chat/src/core/models/mute.dart';
-import 'package:stream_chat/src/core/util/serialization.dart';
+import 'package:stream_chat/src/core/util/serializer.dart';
 import 'package:stream_chat/src/core/models/user.dart';
 
 part 'own_user.g.dart';
@@ -38,7 +38,7 @@ class OwnUser extends User {
 
   /// Create a new instance from a json
   factory OwnUser.fromJson(Map<String, dynamic> json) => _$OwnUserFromJson(
-      Serialization.moveToExtraDataFromRoot(json, topLevelFields));
+      Serializer.moveToExtraDataFromRoot(json, topLevelFields));
 
   /// Create a new instance from [User] object
   factory OwnUser.fromUser(User user) => OwnUser(
@@ -55,35 +55,35 @@ class OwnUser extends User {
   /// List of user devices
   @JsonKey(
       includeIfNull: false,
-      toJson: Serialization.readOnly,
+      toJson: Serializer.readOnly,
       defaultValue: <Device>[])
   final List<Device> devices;
 
   /// List of users muted by the user
   @JsonKey(
       includeIfNull: false,
-      toJson: Serialization.readOnly,
+      toJson: Serializer.readOnly,
       defaultValue: <Mute>[])
   final List<Mute> mutes;
 
   /// List of users muted by the user
   @JsonKey(
       includeIfNull: false,
-      toJson: Serialization.readOnly,
+      toJson: Serializer.readOnly,
       defaultValue: <Mute>[])
   final List<Mute> channelMutes;
 
   /// Total unread messages by the user
   @JsonKey(
-      includeIfNull: false, toJson: Serialization.readOnly, defaultValue: 0)
+      includeIfNull: false, toJson: Serializer.readOnly, defaultValue: 0)
   final int totalUnreadCount;
 
   /// Total unread channels by the user
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final int? unreadChannels;
 
   /// Known top level fields.
-  /// Useful for [Serialization] methods.
+  /// Useful for [Serializer] methods.
   static final topLevelFields = [
     'devices',
     'mutes',
@@ -95,7 +95,7 @@ class OwnUser extends User {
 
   /// Serialize to json
   @override
-  Map<String, dynamic> toJson() => Serialization.moveFromExtraDataToRoot(
+  Map<String, dynamic> toJson() => Serializer.moveFromExtraDataToRoot(
         _$OwnUserToJson(this),
       );
 }

packages/stream_chat/lib/src/core/models/reaction.dart

@@ -1,5 +1,5 @@
 import 'package:json_annotation/json_annotation.dart';
-import 'package:stream_chat/src/core/util/serialization.dart';
+import 'package:stream_chat/src/core/util/serializer.dart';
 import 'package:stream_chat/src/core/models/user.dart';
 
 part 'reaction.g.dart';
@@ -21,7 +21,7 @@ class Reaction {
 
   /// Create a new instance from a json
   factory Reaction.fromJson(Map<String, dynamic> json) =>
-      _$ReactionFromJson(Serialization.moveToExtraDataFromRoot(
+      _$ReactionFromJson(Serializer.moveToExtraDataFromRoot(
         json,
         topLevelFields,
       ));
@@ -33,11 +33,11 @@ class Reaction {
   final String type;
 
   /// The date of the reaction
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime createdAt;
 
   /// The user that sent the reaction
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final User? user;
 
   /// The score of the reaction (ie. number of reactions sent)
@@ -45,7 +45,7 @@ class Reaction {
   final int score;
 
   /// The userId that sent the reaction
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final String? userId;
 
   /// Reaction custom extraData
@@ -66,7 +66,7 @@ class Reaction {
   ];
 
   /// Serialize to json
-  Map<String, dynamic> toJson() => Serialization.moveFromExtraDataToRoot(
+  Map<String, dynamic> toJson() => Serializer.moveFromExtraDataToRoot(
         _$ReactionToJson(this),
       );
 

packages/stream_chat/lib/src/core/models/user.dart

@@ -1,5 +1,5 @@
 import 'package:json_annotation/json_annotation.dart';
-import 'package:stream_chat/src/core/util/serialization.dart';
+import 'package:stream_chat/src/core/util/serializer.dart';
 
 part 'user.g.dart';
 
@@ -22,10 +22,10 @@ class User {
 
   /// Create a new instance from a json
   factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(
-      Serialization.moveToExtraDataFromRoot(json, topLevelFields));
+      Serializer.moveToExtraDataFromRoot(json, topLevelFields));
 
   /// Known top level fields.
-  /// Useful for [Serialization] methods.
+  /// Useful for [Serializer] methods.
   static const topLevelFields = [
     'id',
     'role',
@@ -41,36 +41,36 @@ class User {
   final String id;
 
   /// User role
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final String? role;
 
   /// User role
   @JsonKey(
       includeIfNull: false,
-      toJson: Serialization.readOnly,
+      toJson: Serializer.readOnly,
       defaultValue: <String>[])
   final List<String> teams;
 
   /// Date of user creation
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime createdAt;
 
   /// Date of last user update
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime updatedAt;
 
   /// Date of last user connection
-  @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final DateTime? lastActive;
 
   /// True if user is online
   @JsonKey(
-      includeIfNull: false, toJson: Serialization.readOnly, defaultValue: false)
+      includeIfNull: false, toJson: Serializer.readOnly, defaultValue: false)
   final bool online;
 
   /// True if user is banned from the chat
   @JsonKey(
-      includeIfNull: false, toJson: Serialization.readOnly, defaultValue: false)
+      includeIfNull: false, toJson: Serializer.readOnly, defaultValue: false)
   final bool banned;
 
   /// Map of custom user extraData
@@ -102,7 +102,7 @@ class User {
       other is User && runtimeType == other.runtimeType && id == other.id;
 
   /// Serialize to json
-  Map<String, dynamic> toJson() => Serialization.moveFromExtraDataToRoot(
+  Map<String, dynamic> toJson() => Serializer.moveFromExtraDataToRoot(
         _$UserToJson(this),
       );
 

packages/stream_chat/lib/src/core/util/extension.dart

@@ -9,10 +9,13 @@ extension IterableX<T> on Iterable<T?> {
 }
 
 /// Useful extension functions for [Map]
-extension MapX<K, V> on Map<K, V> {
+extension MapX<K, V> on Map<K?, V?> {
   /// Returns a new map with null keys or values removed
-  Map<K, V> get nullProtected =>
+  Map<K, V> get nullProtected {
-      Map.from(this)..removeWhere((key, value) => key == null || value == null);
+    final nullProtected = {...this}
+      ..removeWhere((key, value) => key == null || value == null);
+    return nullProtected.cast();
+  }
 }
 
 /// Useful extension functions for [String]

packages/stream_chat/lib/src/core/util/serializer.dart

@@ -3,7 +3,7 @@
 Null readonly(_) => null;
 
 /// Helper class for serialization to and from json
-class Serialization {
+class Serializer {
   /// Used to avoid to serialize properties to json
   static const Function readOnly = readonly;
 

packages/stream_chat/test/src/core/util/extension_test.dart

@@ -0,0 +1,48 @@
+import 'package:test/test.dart';
+import 'package:stream_chat/src/core/util/extension.dart';
+
+void main() {
+  test('`.withNullifyer` converts the type into non-nullable', () {
+    final items = ['A', 'B', null, 'D'];
+    expect(items, isA<Iterable<String?>>());
+    expect(items.length, 4);
+
+    final nullifiedItems = items.withNullifyer;
+    expect(nullifiedItems, isA<Iterable<String>>());
+    expect(nullifiedItems.length, 3);
+  });
+
+  test('`.nullProtected should remove all the null keys, value`', () {
+    final map = {'name': 'sahil', 'age': null, null: 'India'};
+    expect(map, isA<Map<String?, String?>>());
+    expect(map.length, 3);
+
+    final nullProtectedMap = map.nullProtected;
+    expect(nullProtectedMap, isA<Map<String, String>>());
+    expect(nullProtectedMap.length, 1);
+  });
+
+  group('mimeType', () {
+    test('should return null if `String` is not a filename', () {
+      const fileName = 'not-a-file-name';
+      final mimeType = fileName.mimeType;
+      expect(mimeType, isNull);
+    });
+
+    test('should return mimeType if string is a filename', () {
+      const fileName = 'dummyFileName.jpeg';
+      final mimeType = fileName.mimeType;
+      expect(mimeType, isNotNull);
+      expect(mimeType!.type, 'image');
+      expect(mimeType.subtype, 'jpeg');
+    });
+
+    test('should return `image/heic` if ends with `heic`', () {
+      const fileName = 'dummyFileName.heic';
+      final mimeType = fileName.mimeType;
+      expect(mimeType, isNotNull);
+      expect(mimeType!.type, 'image');
+      expect(mimeType.subtype, 'heic');
+    });
+  });
+}

packages/stream_chat/test/src/core/util/serializer_test.dart

@@ -0,0 +1,43 @@
+import 'package:stream_chat/src/core/util/serializer.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('Serializer', () {
+    test('moveKeysToMapInPlace', () {
+      final serializer = Serializer.moveToExtraDataFromRoot(
+        {
+          'test': 'test',
+          'name': 'Sahil',
+          'age': 22,
+          'country': 'India',
+        },
+        ['test'],
+      );
+      expect(serializer, {
+        'test': 'test',
+        'extra_data': {
+          'name': 'Sahil',
+          'age': 22,
+          'country': 'India',
+        }
+      });
+    });
+
+    test('moveKeysToMapInPlace', () {
+      final serializer = Serializer.moveFromExtraDataToRoot({
+        'test': 'test',
+        'extra_data': {
+          'name': 'Sahil',
+          'age': 22,
+          'country': 'India',
+        }
+      });
+      expect(serializer, {
+        'test': 'test',
+        'name': 'Sahil',
+        'age': 22,
+        'country': 'India',
+      });
+    });
+  });
+}

packages/stream_chat/test/src/core/util/utils_test.dart

@@ -0,0 +1,15 @@
+import 'package:stream_chat/src/core/util/utils.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test('should generate a `randomId` of length 33', () {
+    final id = randomId(size: 33);
+    expect(id.length, 33);
+  });
+
+  test('should `generateHash` for the passed objects', () {
+    final objects = ['Sahil', 23, 'Flutter Engineer', 'India'];
+    final hash = generateHash(objects);
+    expect(hash, 'WyJTYWhpbCIsMjMsIkZsdXR0ZXIgRW5naW5lZXIiLCJJbmRpYSJd');
+  });
+}