add banner property to member

lib/src/http/cdn/cdn_request.dart

@@ -10,6 +10,8 @@ class CdnRequest extends HttpRequest {
 
   @override
   BaseRequest prepare(Nyxx client) {
+    final queryParameters = this.queryParameters.isEmpty ? null : this.queryParameters;
+
     return Request(method, Uri.https(client.apiOptions.cdnHost, route.path, queryParameters));
   }
 }

lib/src/http/managers/member_manager.dart

@@ -29,6 +29,7 @@ class MemberManager extends Manager<Member> {
       user: maybeParse(raw['user'], client.users.parse),
       nick: raw['nick'] as String?,
       avatarHash: raw['avatar'] as String?,
+      bannerHash: raw['banner'] as String?,
       roleIds: parseMany(raw['roles'] as List, Snowflake.parse),
       joinedAt: DateTime.parse(raw['joined_at'] as String),
       premiumSince: maybeParse(raw['premium_since'], DateTime.parse),

lib/src/models/guild/member.dart

@@ -61,6 +61,9 @@ class Member extends PartialMember {
   /// The hash of this member's avatar image.
   final String? avatarHash;
 
+  /// The hash of this member's banner image.
+  final String? bannerHash;
+
   /// A list of the IDs of the roles this member has.
   final List<Snowflake> roleIds;
 
@@ -96,6 +99,7 @@ class Member extends PartialMember {
     required this.user,
     required this.nick,
     required this.avatarHash,
+    required this.bannerHash,
     required this.roleIds,
     required this.joinedAt,
     required this.premiumSince,
@@ -121,6 +125,15 @@ class Member extends PartialMember {
             ..avatars(),
           hash: avatarHash!,
         );
+
+  CdnAsset get banner => CdnAsset(
+        client: manager.client,
+        base: HttpRoute()
+          ..guilds(id: manager.guildId.toString())
+          ..users(id: id.toString())
+          ..banners(),
+        hash: bannerHash!,
+      );
 }
 
 /// Flags that can be applied to a [Member].

test/unit/http/bucket_test.dart

@@ -37,7 +37,7 @@ void main() {
 
         final bucket = HttpBucket.fromResponse(handler, response);
 
-        expect(bucket, isNot(isNull));
+        expect(bucket, isNotNull);
         expect(bucket?.id, equals('testBucketId'));
         expect(bucket?.remaining, equals(15));
 

test/unit/http/cdn_test.dart

@@ -0,0 +1,23 @@
+import 'package:mocktail/mocktail.dart';
+import 'package:nyxx/nyxx.dart';
+import 'package:test/test.dart';
+
+import '../../mocks/client.dart';
+
+void main() {
+  test('CdnAsset', () {
+    final client = MockNyxx();
+
+    when(() => client.apiOptions).thenReturn(RestApiOptions(token: 'TEST_TOKEN'));
+
+    final asset = CdnAsset(
+      client: client,
+      base: HttpRoute()
+        ..add(HttpRoutePart('hello'))
+        ..add(HttpRoutePart('world')),
+      hash: 'yup',
+    );
+
+    expect(asset.url.toString(), equals('https://cdn.discordapp.com/hello/world/yup.png'));
+  });
+}

test/unit/http/managers/member_manager_test.dart

@@ -12,6 +12,7 @@ final sampleMemberNoUser = {
   "joined_at": "2015-04-26T06:26:56.936000+00:00",
   "deaf": false,
   "mute": false,
+  "banner": "a_coolHashDude",
 
   // These fields are documented as always present but are not in the provided sample
   "flags": 0,
@@ -35,6 +36,7 @@ void checkMemberNoUser(Member member, {Snowflake expectedUserId = const Snowflak
   expect(member.isPending, isFalse);
   expect(member.permissions, isNull);
   expect(member.communicationDisabledUntil, isNull);
+  expect(member.bannerHash, equals('a_coolHashDude'));
 }
 
 void checkMember(Member member, {Snowflake expectedUserId = const Snowflake(80351110224678912)}) {