Test for Github issue 3778

Author: codebrain

src/Tests/Tests.Reproduce/GithubIssue3778.cs

@@ -0,0 +1,43 @@
+using System;
+using Elastic.Xunit.XunitPlumbing;
+using FluentAssertions;
+using Nest;
+using Newtonsoft.Json;
+using Tests.Core.ManagedElasticsearch.Clusters;
+
+namespace Tests.Reproduce
+{
+	public class GithubIssue3778 : IClusterFixture<WritableCluster>
+	{
+		private readonly WritableCluster _cluster;
+
+		public GithubIssue3778(WritableCluster cluster) => _cluster = cluster;
+
+		[I] public void ShouldSerializeAndDeserializeDateRange()
+		{
+			DateTimeOffset? startDate1 = Convert.ToDateTime("2019/01/01").Date;
+			DateTimeOffset? endDate1 = Convert.ToDateTime("2019/04/01").Date;
+
+			var dt = new DateRange { GreaterThanOrEqualTo = startDate1, LessThanOrEqualTo = endDate1 };
+
+			var settings = new JsonSerializerSettings();
+			settings.Converters.Add(new Nest.JsonNetSerializer.Converters.HandleNestTypesOnSourceJsonConverter(_cluster.Client.RequestResponseSerializer));
+
+			var serialized = JsonConvert.SerializeObject(dt, Formatting.Indented, settings);
+			serialized.Equals(@"{
+                             ""gt"": null,
+                             ""gte"": ""2019-01-01T00:00:00+11:00"",
+                             ""lt"": null,
+                             ""lte"": ""2019-04-01T00:00:00+11:00""
+                           }");
+
+			var raw = @"{""gt"": null,""gte"": ""2019-01-01T00:00:00-06:00"",""lt"": null,""lte"": ""2019-04-01T00:00:00-05:00""}";
+			var deserialized = JsonConvert.DeserializeObject<DateRange>(raw, settings);
+
+			deserialized.GreaterThan.Should().BeNull();
+			deserialized.GreaterThanOrEqualTo.Should().Be(Convert.ToDateTime("2019-01-01T00:00:00-06:00"));
+			deserialized.LessThan.Should().BeNull();
+			deserialized.LessThanOrEqualTo.Should().Be(Convert.ToDateTime("2019-04-01T00:00:00-05:00"));
+		}
+	}
+}