make RestNewsChannel throw NotSupportedException also

src/Discord.Net.Rest/Entities/Channels/RestGuildChannel.cs

@@ -15,7 +15,7 @@ namespace Discord.Rest
         private ImmutableArray<Overwrite> _overwrites;
 
         /// <inheritdoc />
-        public IReadOnlyCollection<Overwrite> PermissionOverwrites => _overwrites;
+        public virtual IReadOnlyCollection<Overwrite> PermissionOverwrites => _overwrites;
 
         internal IGuild Guild { get; }
         /// <inheritdoc />
@@ -81,7 +81,7 @@ namespace Discord.Rest
         /// <returns>
         ///     An overwrite object for the targeted user; <c>null</c> if none is set.
         /// </returns>
-        public OverwritePermissions? GetPermissionOverwrite(IUser user)
+        public virtual OverwritePermissions? GetPermissionOverwrite(IUser user)
         {
             for (int i = 0; i < _overwrites.Length; i++)
             {
@@ -98,7 +98,7 @@ namespace Discord.Rest
         /// <returns>
         ///     An overwrite object for the targeted role; <c>null</c> if none is set.
         /// </returns>
-        public OverwritePermissions? GetPermissionOverwrite(IRole role)
+        public virtual OverwritePermissions? GetPermissionOverwrite(IRole role)
         {
             for (int i = 0; i < _overwrites.Length; i++)
             {
@@ -117,7 +117,7 @@ namespace Discord.Rest
         /// <returns>
         ///     A task representing the asynchronous permission operation for adding the specified permissions to the channel.
         /// </returns>
-        public async Task AddPermissionOverwriteAsync(IUser user, OverwritePermissions permissions, RequestOptions options = null)
+        public virtual async Task AddPermissionOverwriteAsync(IUser user, OverwritePermissions permissions, RequestOptions options = null)
         {
             await ChannelHelper.AddPermissionOverwriteAsync(this, Discord, user, permissions, options).ConfigureAwait(false);
             _overwrites = _overwrites.Add(new Overwrite(user.Id, PermissionTarget.User, new OverwritePermissions(permissions.AllowValue, permissions.DenyValue)));
@@ -131,7 +131,7 @@ namespace Discord.Rest
         /// <returns>
         ///     A task representing the asynchronous permission operation for adding the specified permissions to the channel.
         /// </returns>
-        public async Task AddPermissionOverwriteAsync(IRole role, OverwritePermissions permissions, RequestOptions options = null)
+        public virtual async Task AddPermissionOverwriteAsync(IRole role, OverwritePermissions permissions, RequestOptions options = null)
         {
             await ChannelHelper.AddPermissionOverwriteAsync(this, Discord, role, permissions, options).ConfigureAwait(false);
             _overwrites = _overwrites.Add(new Overwrite(role.Id, PermissionTarget.Role, new OverwritePermissions(permissions.AllowValue, permissions.DenyValue)));
@@ -145,7 +145,7 @@ namespace Discord.Rest
         /// <returns>
         ///     A task representing the asynchronous operation for removing the specified permissions from the channel.
         /// </returns>
-        public async Task RemovePermissionOverwriteAsync(IUser user, RequestOptions options = null)
+        public virtual async Task RemovePermissionOverwriteAsync(IUser user, RequestOptions options = null)
         {
             await ChannelHelper.RemovePermissionOverwriteAsync(this, Discord, user, options).ConfigureAwait(false);
 
@@ -166,7 +166,7 @@ namespace Discord.Rest
         /// <returns>
         ///     A task representing the asynchronous operation for removing the specified permissions from the channel.
         /// </returns>
-        public async Task RemovePermissionOverwriteAsync(IRole role, RequestOptions options = null)
+        public virtual async Task RemovePermissionOverwriteAsync(IRole role, RequestOptions options = null)
         {
             await ChannelHelper.RemovePermissionOverwriteAsync(this, Discord, role, options).ConfigureAwait(false);
 

src/Discord.Net.Rest/Entities/Channels/RestNewsChannel.cs

@@ -24,5 +24,30 @@ namespace Discord.Rest
             entity.Update(model);
             return entity;
         }
+        public override int SlowModeInterval => throw new NotSupportedException("News channels do not support Slow Mode.");
+        public override Task AddPermissionOverwriteAsync(IRole role, OverwritePermissions permissions, RequestOptions options = null)
+        {
+            throw new NotSupportedException("News channels do not support Overwrite Permissions.");
+        }
+        public override Task AddPermissionOverwriteAsync(IUser user, OverwritePermissions permissions, RequestOptions options = null)
+        {
+            throw new NotSupportedException("News channels do not support Overwrite Permissions.");
+        }
+        public override OverwritePermissions? GetPermissionOverwrite(IRole role)
+        {
+            throw new NotSupportedException("News channels do not support Overwrite Permissions.");
+        }
+        public override OverwritePermissions? GetPermissionOverwrite(IUser user)
+        {
+            throw new NotSupportedException("News channels do not support Overwrite Permissions.");
+        }
+        public override Task RemovePermissionOverwriteAsync(IRole role, RequestOptions options = null)
+        {
+            throw new NotSupportedException("News channels do not support Overwrite Permissions.");
+        }
+        public override Task RemovePermissionOverwriteAsync(IUser user, RequestOptions options = null)
+        {
+            throw new NotSupportedException("News channels do not support Overwrite Permissions.");
+        }
     }
 }

src/Discord.Net.Rest/Entities/Channels/RestTextChannel.cs

@@ -17,7 +17,7 @@ namespace Discord.Rest
         /// <inheritdoc />
         public string Topic { get; private set; }
         /// <inheritdoc />
-        public int SlowModeInterval { get; private set; } 
+        public virtual int SlowModeInterval { get; private set; } 
         /// <inheritdoc />
         public ulong? CategoryId { get; private set; }