resolve build warnings for permission tests

test/Discord.Net.Tests/Tests.ChannelPermissions.cs

@@ -7,7 +7,7 @@ namespace Discord
     public partial class Tests
     {
         [Fact]
-        public async Task TestChannelPermission()
+        public Task TestChannelPermission()
         {
             var perm = new ChannelPermissions();
 
@@ -82,9 +82,10 @@ namespace Discord
                 | ChannelPermission.UseVAD
                 );
             Assert.Equal(groupChannel, ChannelPermissions.Group.RawValue);
+            return Task.CompletedTask;
         }
 
-        public async Task TestChannelPermissionModify()
+        public Task TestChannelPermissionModify()
         {
             // test channel permission modify
 
@@ -311,14 +312,16 @@ namespace Discord
             perm = perm.Modify(manageWebhooks: false);
             Assert.False(perm.ManageWebhooks);
             Assert.Equal(ChannelPermissions.None.RawValue, perm.RawValue);
+            return Task.CompletedTask;
         }
 
         [Fact]
-        public async Task TestChannelTypeResolution()
+        public Task TestChannelTypeResolution()
         {
             ITextChannel someChannel = null;
             // null channels will throw exception
             Assert.Throws<ArgumentException>(() => ChannelPermissions.All(someChannel));
+            return Task.CompletedTask;
         }
     }
 }

test/Discord.Net.Tests/Tests.GuildPermissions.cs

@@ -7,7 +7,7 @@ namespace Discord
     public partial class Tests
     {
         [Fact]
-        public async Task TestGuildPermission()
+        public Task TestGuildPermission()
         {
             // Test Guild Permission Constructors
             var perm = new GuildPermissions();
@@ -46,10 +46,12 @@ namespace Discord
                 GuildPermission.SendMessages | GuildPermission.SendTTSMessages | GuildPermission.EmbedLinks |
                 GuildPermission.AttachFiles);
             Assert.Equal(webHookPermissions, GuildPermissions.Webhook.RawValue);
+
+            return Task.CompletedTask;
         }
 
         [Fact]
-        public async Task TestGuildPermissionModify()
+        public Task TestGuildPermissionModify()
         {
             var perm = new GuildPermissions();
 
@@ -298,6 +300,7 @@ namespace Discord
             Assert.False(perm.ManageEmojis);
             Assert.Equal(GuildPermissions.None.RawValue, perm.RawValue);
 
+            return Task.CompletedTask;
         }
 
     }