# ElasticSearch Unit Testing - best practices and approach
**URL:** https://discuss.elastic.co/t/elasticsearch-unit-testing-best-practices-and-approach/168851
**Category:** Elasticsearch
**Created:** [February 18, 2019, 2:46pm UTC](https://discuss.elastic.co/t/elasticsearch-unit-testing-best-practices-and-approach/168851 "2019-02-18T14:46:18Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Calvin-J-Scott](https://discuss.elastic.co/u/Calvin-J-Scott)
#### Post date: [February 18, 2019, 2:46pm UTC](https://discuss.elastic.co/t/elasticsearch-unit-testing-best-practices-and-approach/168851/1 "2019-02-18T14:46:19Z")
Hi All,
I am currently facing a issue when trying to unit test my elasticsearch search method.
Here is my Service:
```
@Service
@Slf4j
public class FullService {
private final RestHighLevelClient client;
private final ObjectMapper objectMapper;
private final SearchRequest searchRequest = new SearchRequest();
private final SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
private SearchResponse searchResponse = new SearchResponse();
private final ESBuilder esBuilder = new ESBuilder();
FullService(RestHighLevelClient client, ObjectMapper objectMapper) {
this.client = client;
this.objectMapper = objectMapper;
searchRequest.indices(INDEX);
}
public Results findAll() throws IOException {
searchSourceBuilder.query(QueryBuilders.matchAllQuery());
searchRequest.source(searchSourceBuilder);
searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
return getAllSearchResult(searchResponse);
}
public Results findByRequestSearch(UserSearchRequest request) throws IOException {
searchSourceBuilder.query(esBuilder.buildQuery(request));
searchRequest.source(searchSourceBuilder);
searchResponse = client.search(searchRequest,RequestOptions.DEFAULT);
return getAllSearchResult(searchResponse);
}
}
```
The Client is built outside the class in an ESConfig file:
```
@Configuration
class ESConfig {
@Value("${elasticsearch.host}")
private String host;
@Value("${elasticsearch.port}")
private int port;
@Value("${elasticsearch.username}")
private String userName;
@Value("${elasticsearch.password}")
private String password;
@Bean(destroyMethod = "close")
public RestHighLevelClient restClient() {
final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY,
new UsernamePasswordCredentials(userName, password));
RestClientBuilder builder = RestClient.builder(new HttpHost(host, port))
.setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));
return new RestHighLevelClient(builder);
}
}
```
So I'm trying to test the findByRequestSearch() method. but keep getting a null pointer exception
Here is my Test Class:
```
@RunWith(PowerMockRunner.class)
public class powerMockTest {
@Mock
RestHighLevelClient highLevelClient;
ObjectMapper objectMapper;
SearchSourceBuilder searchSourceBuilder;
ESBuilder esBuilder;
private FullService fullService;
@Mock
SearchResponse searchResponse;
@Before
public void setUp() throws Exception {
objectMapper = new ObjectMapper();
fullService = new FullService(highLevelClient,objectMapper);
searchSourceBuilder = new SearchSourceBuilder();
esBuilder = new ESBuilder();
}
@Test
public void testFindByRequest() throws IOException {
//Build Request
UserSearchRequest request = new UserSearchRequest();
SearchCriteria searchCriteria = new SearchCriteria();
List searchTermsList = new ArrayList<>();
SearchTerms searchTerms = new SearchTerms();
searchTerms.setAttribute("compoundName");
searchTerms.setValue("Odell");
searchTermsList.add(searchTerms);
searchCriteria.setSearchTerms(searchTermsList);
request.setSearchCriteria(searchCriteria);
//ES Search Request
SearchRequest searchRequest = new SearchRequest();
searchSourceBuilder.query(esBuilder.buildQuery(request));
searchRequest.source(searchSourceBuilder);
Mockito.when(highLevelClient.search(searchRequest, RequestOptions.DEFAULT)).thenReturn(searchResponse);
Mockito.verify(highLevelClient,Mockito.times(1)).search(Mockito.any(SearchRequest.class),RequestOptions.DEFAULT);
Mockito.verifyNoMoreInteractions(highLevelClient);
}}
```
Any Help with this would be appreciated but also any guidance on best practices around testing methods that call ES components.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [March 18, 2019, 2:46pm UTC](https://discuss.elastic.co/t/elasticsearch-unit-testing-best-practices-and-approach/168851/2 "2019-03-18T14:46:19Z")
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