GithubIssue4787.cs

/* SPDX-License-Identifier: Apache-2.0
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*/
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using System;
using System.Text;
using OpenSearch.OpenSearch.Xunit.XunitPlumbing;
using OpenSearch.Net;
using FluentAssertions;
using OpenSearch.Client;
using Tests.Core.Client;

namespace Tests.Reproduce
{
	public class GithubIssue4787
	{
		[U]
		public void DoNotSerializeNullSourceFilter()
		{
			var connectionSettings = new ConnectionSettings(new InMemoryConnection()).DisableDirectStreaming();
			var client = new OpenSearchClient(connectionSettings);

			Func<ISearchResponse<object>> action = () =>
				client.Search<object>(s => s
					.Query(q => q
						.MatchAll()
					)
					.Index("index")
					.Source(sfd => null)
				);

			var response = action.Should().NotThrow().Subject;

			var json = Encoding.UTF8.GetString(response.ApiCall.RequestBodyInBytes);
			json.Should().Be(@"{""query"":{""match_all"":{}}}");
		}
	}
}