Separate out GuildPermissions and ChannelPermissions tests from main partial Tests class because they do not need to have access to the main test fixture

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

@@ -1,10 +1,10 @@
-using System;
+using System;
 using System.Threading.Tasks;
 using Xunit;
 
 namespace Discord
 {
-    public partial class Tests
+    public class ChannelPermissionsTests
     {
         [Fact]
         public Task TestChannelPermission()

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

@@ -1,10 +1,10 @@
-using System;
+using System;
 using System.Threading.Tasks;
 using Xunit;
 
 namespace Discord
 {
-    public partial class Tests
+    public class GuidPermissionsTests
     {
         [Fact]
         public Task TestGuildPermission()