diff --git a/src/main/java/de/gwdg/metadataqa/api/calculator/Indexer.java b/src/main/java/de/gwdg/metadataqa/api/calculator/Indexer.java
index 004dcce2..20054071 100644
--- a/src/main/java/de/gwdg/metadataqa/api/calculator/Indexer.java
+++ b/src/main/java/de/gwdg/metadataqa/api/calculator/Indexer.java
@@ -32,7 +32,6 @@ public Indexer(SolrClient solrClient, Schema schema) {
 
   @Override
   public List<MetricResult> measure(PathCache cache) {
-    schema.getRecordId();
     try {
       String recordId = extractValue(cache, schema.getRecordId().getJsonPath()).get(0);
 
diff --git a/src/test/java/de/gwdg/metadataqa/api/calculator/IndexerTest.java b/src/test/java/de/gwdg/metadataqa/api/calculator/IndexerTest.java
new file mode 100644
index 00000000..d20a4912
--- /dev/null
+++ b/src/test/java/de/gwdg/metadataqa/api/calculator/IndexerTest.java
@@ -0,0 +1,71 @@
+package de.gwdg.metadataqa.api.calculator;
+
+import de.gwdg.metadataqa.api.json.JsonBranch;
+import de.gwdg.metadataqa.api.model.PathCacheFactory;
+import de.gwdg.metadataqa.api.model.pathcache.CsvPathCache;
+import de.gwdg.metadataqa.api.schema.BaseSchema;
+import de.gwdg.metadataqa.api.schema.CsvAwareSchema;
+import de.gwdg.metadataqa.api.schema.Format;
+import de.gwdg.metadataqa.api.schema.Schema;
+import de.gwdg.metadataqa.api.uniqueness.SolrClientMock;
+import de.gwdg.metadataqa.api.uniqueness.SolrConfiguration;
+import de.gwdg.metadataqa.api.util.CsvReader;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.junit.Assert.*;
+
+public class IndexerTest {
+
+  Indexer indexer;
+  CsvPathCache cache;
+  SolrClientMock solrClient;
+
+  @Before
+  public void setUp() throws Exception {
+    SolrConfiguration solrConfiguration = new SolrConfiguration("localhost", "8983", "solr");
+    Schema schema = getSchema(Format.CSV);
+    solrClient = new SolrClientMock(solrConfiguration);
+    indexer = new Indexer(solrClient, schema);
+    assertNotNull(indexer);
+
+    cache = (CsvPathCache) PathCacheFactory.getInstance(schema.getFormat(), "URL,two three");
+    cache.setCsvReader(new CsvReader().setHeader( ((CsvAwareSchema) schema).getHeader() ));
+  }
+
+  @Test
+  public void measure() {
+    indexer.measure(cache);
+    assertEquals("URL", solrClient.getId());
+    assertTrue(solrClient.getObjectMap().containsKey("name_ss"));
+    assertEquals(List.of("two three"), solrClient.getObjectMap().get("name_ss"));
+  }
+
+  @Test
+  public void getHeader() {
+    assertEquals(List.of(), indexer.getHeader());
+  }
+
+  @Test
+  public void getCalculatorName() {
+    assertEquals("indexer", indexer.getCalculatorName());
+  }
+
+  @Test
+  public void shutDown() {
+    indexer.shutDown();
+    assertTrue(solrClient.isCommited());
+  }
+
+  private Schema getSchema(Format format) {
+    BaseSchema schema = new BaseSchema()
+      .setFormat(format)
+      .addField(new JsonBranch("url").setExtractable().setIndexField("url"))
+      .addField(new JsonBranch("name").setExtractable().setIndexField("name"));
+    schema.setRecordId(schema.getPathByLabel("url"));
+    return schema;
+  }
+
+}
\ No newline at end of file
diff --git a/src/test/java/de/gwdg/metadataqa/api/uniqueness/SolrClientMock.java b/src/test/java/de/gwdg/metadataqa/api/uniqueness/SolrClientMock.java
index 551a0b28..5ea80e0e 100644
--- a/src/test/java/de/gwdg/metadataqa/api/uniqueness/SolrClientMock.java
+++ b/src/test/java/de/gwdg/metadataqa/api/uniqueness/SolrClientMock.java
@@ -8,6 +8,10 @@
 
 public class SolrClientMock implements SolrClient {
 
+  private String id;
+  private Map<String, List<String>> objectMap;
+  private boolean commited = false;
+
   public SolrClientMock(SolrConfiguration configuration) {
   }
 
@@ -35,16 +39,29 @@ public String getSolrSearchResponse(String solrField, String value) {
 
   @Override
   public void indexMap(String id, Map<String, List<String>> objectMap) throws IOException, SolrServerException {
-
+    this.id = id;
+    this.objectMap = objectMap;
   }
 
   @Override
   public void commit() {
-
+    commited = true;
   }
 
   @Override
   public void deleteAll() {
 
   }
+
+  public String getId() {
+    return id;
+  }
+
+  public Map<String, List<String>> getObjectMap() {
+    return objectMap;
+  }
+
+  public boolean isCommited() {
+    return commited;
+  }
 }