diff --git a/core/src/test/java/org/elasticsearch/ingest/IngestServiceTests.java b/core/src/test/java/org/elasticsearch/ingest/IngestServiceTests.java
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+++ b/core/src/test/java/org/elasticsearch/ingest/IngestServiceTests.java
@@ -0,0 +1,53 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch 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.elasticsearch.ingest;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Map;
+
+import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.env.Environment;
+import org.elasticsearch.plugins.IngestPlugin;
+import org.elasticsearch.script.ScriptService;
+import org.elasticsearch.test.ESTestCase;
+
+public class IngestServiceTests extends ESTestCase {
+    private final IngestPlugin DUMMY_PLUGIN = new IngestPlugin() {
+        @Override
+        public Map<String, Processor.Factory> getProcessors(Environment env, ScriptService scriptService, TemplateService templateService) {
+            return Collections.singletonMap("foo", (factories, tag, config) -> null);
+        }
+    };
+
+    public void testIngestPlugin() {
+        IngestService ingestService = new IngestService(Settings.EMPTY, null, null, null, Collections.singletonList(DUMMY_PLUGIN));
+        Map<String, Processor.Factory> factories = ingestService.getPipelineStore().getProcessorFactories();
+        assertTrue(factories.containsKey("foo"));
+        assertEquals(1, factories.size());
+    }
+
+    public void testIngestPluginDuplicate() {
+        IllegalArgumentException e = expectThrows(IllegalArgumentException.class, () ->
+            new IngestService(Settings.EMPTY, null, null, null, Arrays.asList(DUMMY_PLUGIN, DUMMY_PLUGIN))
+        );
+        assertTrue(e.getMessage(), e.getMessage().contains("already registered"));
+    }
+}