Elasticsearch high level java client mock test

111505 · October 25, 2021, 11:38am

I am using a RestHighlevelclient in the Spring Boot environment.
I want to create a JUnit Test Code, but I can not find a way.
Is there no test method to officially provide?
I want to test the normal operation of basic queries. Is there no way?

dadoonet · October 25, 2021, 3:39pm

To run integration tests (not unit tests) you should run an Elasticsearch node/cluster in something close to a production environment, like a real Elasticsearch server instance.

To do integration tests, you can for example:

Using Docker and TestContainers: Elasticsearch container - Testcontainers
Using Docker from maven: fscrawler/pom.xml at e15dddf72b1ed094dad279d492e4e0314f73683f · dadoonet/fscrawler · GitHub

For sure, integration tests must be run against a real Elasticsearch instance.
Unit tests should not require any third party tool to run IMHO.

For Unit Test, you could read what users have been sharing in this issue:

github.com/elastic/elasticsearch

RestHighLevelClient impossible mocking

opened 04:02PM - 27 Mar 19 UTC

MatCuk

:Data Management/Java High Level REST Client Team:Data Management

Hi, I'm trying to unit test some code using RestHighLevelClient. I have … ```java private synchronized void createIndex(String indexName) throws IOException { if (!client.exists(new GetRequest(indexName), RequestOptions.DEFAULT)) { CreateIndexRequest request = new CreateIndexRequest(indexName); request.mapping(indexType, ElasticSearchConstants.MAPPING_SOURCE); request.alias(new Alias(alias)); request.settings(ElasticSearchConstants.MAPPING_SETTINGS, XContentType.JSON); client.indices().create(request, RequestOptions.DEFAULT); } } ``` Now i want to verify that client.indices().create was called. RestHighLevelClient is not final and I was able to mock it. Mock for RestHighLevelClient.indices() returns null by default. So of course we want to mock that ``` when(elasticSearchClient.indices()).thenReturn(mock(IndicesClient.class)); ``` BAM problem. IndicesClient is final class. I can't mock it. So I can't test if create gets called and with which parameters. IndicesClient should not be final class or indices() should return an interface and your final class implementation is hidden away. This is pretty much basic stuff for public APIs guys.

Hope this helps.

system · November 22, 2021, 3:40pm

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