Using InMemoryConnection to test ElasticSearch

Elastic Stack Elasticsearch
1

I'm trying to add testing around our use of ElasticSearch (in C# using Nest 1.4.2) and want to use InMemoryConnection but I'm missing something (I assume) and having no success.

I've created this simple Nunit test case as a boiled down example of my issue

`
using System;
using Elasticsearch.Net.Connection;
using FluentAssertions;
using Nest;
using NUnit.Framework;

namespace NestTest
{
    public class InMemoryConnections
    {
        public class TestThing
        {
            public string Stuff { get; }

            public TestThing(string stuff)
            {
                Stuff = stuff;
            }
        }

        [Test]
        public void CanBeQueried()
        {
            var connectionSettings = new ConnectionSettings(new Uri("http://foo.test"), "default_index");

            var c = new ElasticClient(connectionSettings, new InMemoryConnection());
            c.Index(new TestThing("peter rabbit"));

            var result = c.Search<TestThing>(sd => sd);

            result.ConnectionStatus.Success.Should().BeTrue();
        }
    }
}

`

The connection status reports false for success, an http status code of 0, and an original exception of "{"Could not parse server exception"}"

2

Ah! If I create the elastic client using

var c = new ElasticClient(connectionSettings, new InMemoryConnection(connectionSettings));

the query is now successful but doesn't find the document I just indexed...

3

Updating to 2.3.3 and new syntax

        [Test]
        public void CanBeQueried()
        {

            var connectionPool = new SingleNodeConnectionPool(new Uri("http://localhost:9200"));
            var settings = new ConnectionSettings(connectionPool, new InMemoryConnection());
            settings.DefaultIndex("default");

            var c = new ElasticClient(settings);
            
            c.Index(new TestThing("peter rabbit"));

            var result = c.Search<TestThing>(sd => sd);
            
            result.CallDetails.Success.Should().BeTrue();
            result.Documents.Single().Stuff.Should().Be("peter rabbit");
        }

fails in the same way... i.e. the query is reported as successful but returns 0 documents

4

I've crossposted here http://stackoverflow.com/questions/38207159/using-inmemoryconnection-to-test-elasticsearch

5

the query is now successful but doesn't find the document I just indexed...

That's most likely because the index hasn't been refreshed since the document was indexed. You should be able to request a refresh as part of your index request.