SOLR-16952: add DocsStreamerTest.testDenseVectorField test (#2107)

(cherry picked from commit ca146aa)

solr/core/src/test/org/apache/solr/response/DocsStreamerTest.java

@@ -0,0 +1,46 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.response;
+
+import java.util.Arrays;
+import java.util.List;
+import org.apache.lucene.index.IndexableField;
+import org.apache.solr.SolrTestCaseJ4;
+import org.apache.solr.schema.SchemaField;
+import org.junit.BeforeClass;
+
+public class DocsStreamerTest extends SolrTestCaseJ4 {
+
+  @BeforeClass
+  public static void beforeClass() throws Exception {
+    System.setProperty("enable.update.log", "false"); // schema12 doesn't support _version_
+    initCore("solrconfig.xml", "schema12.xml");
+  }
+
+  public void testDenseVectorField() throws Exception {
+    List<Float> values = Arrays.asList(1.1f, 2.2f, 3.3f, 4.4f);
+    List<String> dsValues =
+        Arrays.asList("1.1", "2.2", "3.3", "4.4"); // should be Float too, see SOLR-16952
+
+    SchemaField sf = h.getCore().getLatestSchema().getField("vector");
+    List<IndexableField> fields = sf.createFields(values);
+    for (int idx = 1; idx < fields.size(); ++idx) {
+      Object value = DocsStreamer.getValue(sf, fields.get(idx));
+      assertEquals(dsValues.get(idx - 1), value);
+    }
+  }
+}