How to test an Attribute in Hot Chocolate - hotchocolate

Question

Using Hot Chocolate, how do I integration test the implementation of a ObjectFieldDescriptorAttribute?
Given the following implementation:
public class ValidApiKeyAttribute : ObjectFieldDescriptorAttribute
{
public override void OnConfigure(IDescriptorContext descriptorContext, IObjectFieldDescriptor descriptor, MemberInfo member)
{
descriptor
.Use(next => async context =>
{
var httpContextAccessor = context.Services.GetService(typeof(IHttpContextAccessor))
as IHttpContextAccessor;
var authenticationSettings = context.Services.GetService(typeof(IOptions<AuthenticationSettings>))
as IOptions<AuthenticationSettings>;
// --
await next(context);
});
}
}
Which is called from a Query class
public class Query
{
[ValidApiKey]
public IQueryable<Something> GetSomething()
{
// --
}
}
How do I unit test the middleware? I assume I need to mock the FieldDelegate and the IObjectFieldDescriptor? This is what I've got so far:
[Fact]
public async Task Query_GetSomething_Success()
{
// arrange
var request = QueryRequestBuilder.New()
.SetQuery("")
.Create();
//? var fieldDelegate = new FieldDelegate(async (context) => await Task.CompletedTask);
var executor = await new ServiceCollection()
.AddGraphQL()
.AddType<Query>()
.BuildRequestExecutorAsync();
// act and assert
var result = await executor.ExecuteAsync(request);
}