feat: fixed for the issue (#7)

lib/src/service/base_service.dart

@@ -285,7 +285,7 @@ abstract class BaseService implements _Service {
 
   Response checkResponse(
     final Response response,
-    final bool checkUnprocessableEntity,
+    final bool checkEntity,
   ) {
     if (response.statusCode == 401) {
       throw UnauthorizedException(
@@ -298,8 +298,8 @@ abstract class BaseService implements _Service {
       throw RateLimitExceededException('Rate limit exceeded.', response);
     }
 
-    if (checkUnprocessableEntity) {
-      if (response.statusCode == 422) {
+    if (checkEntity) {
+      if (400 <= response.statusCode && response.statusCode < 500) {
         throw MastodonException(
           'Required parameter is missing or improperly formatted.',
           response,

lib/src/service/entities/featured_tag.dart

@@ -0,0 +1,33 @@
+// Copyright 2022 Kato Shinya. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided the conditions.
+
+// Package imports:
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'featured_tag.freezed.dart';
+part 'featured_tag.g.dart';
+
+@freezed
+class FeaturedTag with _$FeaturedTag {
+  @JsonSerializable(includeIfNull: false)
+  const factory FeaturedTag({
+    /// The internal ID of the featured tag in the database.
+    required String id,
+
+    /// The name of the hashtag being featured.
+    required String name,
+
+    /// A link to all statuses by a user that contain this hashtag.
+    required String url,
+
+    /// The number of authored statuses containing this hashtag.
+    required int statusesCount,
+
+    /// The timestamp of the last authored status containing this hashtag.
+    required DateTime lastStatusAt,
+  }) = _FeaturedTag;
+
+  factory FeaturedTag.fromJson(Map<String, Object?> json) =>
+      _$FeaturedTagFromJson(json);
+}

lib/src/service/entities/featured_tag.freezed.dart

@@ -0,0 +1,267 @@
+// coverage:ignore-file
+// GENERATED CODE - DO NOT MODIFY BY HAND
+// ignore_for_file: type=lint
+// ignore_for_file: unused_element, deprecated_member_use, deprecated_member_use_from_same_package, use_function_type_syntax_for_parameters, unnecessary_const, avoid_init_to_null, invalid_override_different_default_values_named, prefer_expression_function_bodies, annotate_overrides, invalid_annotation_target
+
+part of 'featured_tag.dart';
+
+// **************************************************************************
+// FreezedGenerator
+// **************************************************************************
+
+T _$identity<T>(T value) => value;
+
+final _privateConstructorUsedError = UnsupportedError(
+    'It seems like you constructed your class using `MyClass._()`. This constructor is only meant to be used by freezed and you are not supposed to need it nor use it.\nPlease check the documentation here for more information: https://github.com/rrousselGit/freezed#custom-getters-and-methods');
+
+FeaturedTag _$FeaturedTagFromJson(Map<String, dynamic> json) {
+  return _FeaturedTag.fromJson(json);
+}
+
+/// @nodoc
+mixin _$FeaturedTag {
+  /// The internal ID of the featured tag in the database.
+  String get id => throw _privateConstructorUsedError;
+
+  /// The name of the hashtag being featured.
+  String get name => throw _privateConstructorUsedError;
+
+  /// A link to all statuses by a user that contain this hashtag.
+  String get url => throw _privateConstructorUsedError;
+
+  /// The number of authored statuses containing this hashtag.
+  int get statusesCount => throw _privateConstructorUsedError;
+
+  /// The timestamp of the last authored status containing this hashtag.
+  DateTime get lastStatusAt => throw _privateConstructorUsedError;
+
+  Map<String, dynamic> toJson() => throw _privateConstructorUsedError;
+  @JsonKey(ignore: true)
+  $FeaturedTagCopyWith<FeaturedTag> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $FeaturedTagCopyWith<$Res> {
+  factory $FeaturedTagCopyWith(
+          FeaturedTag value, $Res Function(FeaturedTag) then) =
+      _$FeaturedTagCopyWithImpl<$Res, FeaturedTag>;
+  @useResult
+  $Res call(
+      {String id,
+      String name,
+      String url,
+      int statusesCount,
+      DateTime lastStatusAt});
+}
+
+/// @nodoc
+class _$FeaturedTagCopyWithImpl<$Res, $Val extends FeaturedTag>
+    implements $FeaturedTagCopyWith<$Res> {
+  _$FeaturedTagCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? id = null,
+    Object? name = null,
+    Object? url = null,
+    Object? statusesCount = null,
+    Object? lastStatusAt = null,
+  }) {
+    return _then(_value.copyWith(
+      id: null == id
+          ? _value.id
+          : id // ignore: cast_nullable_to_non_nullable
+              as String,
+      name: null == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String,
+      url: null == url
+          ? _value.url
+          : url // ignore: cast_nullable_to_non_nullable
+              as String,
+      statusesCount: null == statusesCount
+          ? _value.statusesCount
+          : statusesCount // ignore: cast_nullable_to_non_nullable
+              as int,
+      lastStatusAt: null == lastStatusAt
+          ? _value.lastStatusAt
+          : lastStatusAt // ignore: cast_nullable_to_non_nullable
+              as DateTime,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$_FeaturedTagCopyWith<$Res>
+    implements $FeaturedTagCopyWith<$Res> {
+  factory _$$_FeaturedTagCopyWith(
+          _$_FeaturedTag value, $Res Function(_$_FeaturedTag) then) =
+      __$$_FeaturedTagCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call(
+      {String id,
+      String name,
+      String url,
+      int statusesCount,
+      DateTime lastStatusAt});
+}
+
+/// @nodoc
+class __$$_FeaturedTagCopyWithImpl<$Res>
+    extends _$FeaturedTagCopyWithImpl<$Res, _$_FeaturedTag>
+    implements _$$_FeaturedTagCopyWith<$Res> {
+  __$$_FeaturedTagCopyWithImpl(
+      _$_FeaturedTag _value, $Res Function(_$_FeaturedTag) _then)
+      : super(_value, _then);
+
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? id = null,
+    Object? name = null,
+    Object? url = null,
+    Object? statusesCount = null,
+    Object? lastStatusAt = null,
+  }) {
+    return _then(_$_FeaturedTag(
+      id: null == id
+          ? _value.id
+          : id // ignore: cast_nullable_to_non_nullable
+              as String,
+      name: null == name
+          ? _value.name
+          : name // ignore: cast_nullable_to_non_nullable
+              as String,
+      url: null == url
+          ? _value.url
+          : url // ignore: cast_nullable_to_non_nullable
+              as String,
+      statusesCount: null == statusesCount
+          ? _value.statusesCount
+          : statusesCount // ignore: cast_nullable_to_non_nullable
+              as int,
+      lastStatusAt: null == lastStatusAt
+          ? _value.lastStatusAt
+          : lastStatusAt // ignore: cast_nullable_to_non_nullable
+              as DateTime,
+    ));
+  }
+}
+
+/// @nodoc
+
+@JsonSerializable(includeIfNull: false)
+class _$_FeaturedTag implements _FeaturedTag {
+  const _$_FeaturedTag(
+      {required this.id,
+      required this.name,
+      required this.url,
+      required this.statusesCount,
+      required this.lastStatusAt});
+
+  factory _$_FeaturedTag.fromJson(Map<String, dynamic> json) =>
+      _$$_FeaturedTagFromJson(json);
+
+  /// The internal ID of the featured tag in the database.
+  @override
+  final String id;
+
+  /// The name of the hashtag being featured.
+  @override
+  final String name;
+
+  /// A link to all statuses by a user that contain this hashtag.
+  @override
+  final String url;
+
+  /// The number of authored statuses containing this hashtag.
+  @override
+  final int statusesCount;
+
+  /// The timestamp of the last authored status containing this hashtag.
+  @override
+  final DateTime lastStatusAt;
+
+  @override
+  String toString() {
+    return 'FeaturedTag(id: $id, name: $name, url: $url, statusesCount: $statusesCount, lastStatusAt: $lastStatusAt)';
+  }
+
+  @override
+  bool operator ==(dynamic other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$_FeaturedTag &&
+            (identical(other.id, id) || other.id == id) &&
+            (identical(other.name, name) || other.name == name) &&
+            (identical(other.url, url) || other.url == url) &&
+            (identical(other.statusesCount, statusesCount) ||
+                other.statusesCount == statusesCount) &&
+            (identical(other.lastStatusAt, lastStatusAt) ||
+                other.lastStatusAt == lastStatusAt));
+  }
+
+  @JsonKey(ignore: true)
+  @override
+  int get hashCode =>
+      Object.hash(runtimeType, id, name, url, statusesCount, lastStatusAt);
+
+  @JsonKey(ignore: true)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$_FeaturedTagCopyWith<_$_FeaturedTag> get copyWith =>
+      __$$_FeaturedTagCopyWithImpl<_$_FeaturedTag>(this, _$identity);
+
+  @override
+  Map<String, dynamic> toJson() {
+    return _$$_FeaturedTagToJson(
+      this,
+    );
+  }
+}
+
+abstract class _FeaturedTag implements FeaturedTag {
+  const factory _FeaturedTag(
+      {required final String id,
+      required final String name,
+      required final String url,
+      required final int statusesCount,
+      required final DateTime lastStatusAt}) = _$_FeaturedTag;
+
+  factory _FeaturedTag.fromJson(Map<String, dynamic> json) =
+      _$_FeaturedTag.fromJson;
+
+  @override
+
+  /// The internal ID of the featured tag in the database.
+  String get id;
+  @override
+
+  /// The name of the hashtag being featured.
+  String get name;
+  @override
+
+  /// A link to all statuses by a user that contain this hashtag.
+  String get url;
+  @override
+
+  /// The number of authored statuses containing this hashtag.
+  int get statusesCount;
+  @override
+
+  /// The timestamp of the last authored status containing this hashtag.
+  DateTime get lastStatusAt;
+  @override
+  @JsonKey(ignore: true)
+  _$$_FeaturedTagCopyWith<_$_FeaturedTag> get copyWith =>
+      throw _privateConstructorUsedError;
+}

lib/src/service/entities/list_replies_policy.dart

@@ -0,0 +1,14 @@
+// Copyright 2022 Kato Shinya. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided the conditions.
+
+enum ListRepliesPolicy {
+  /// Show replies to any followed user.
+  followed,
+
+  /// Show replies to members of the list.
+  list,
+
+  /// Show replies to no one.
+  none,
+}