Alerts : add alert serialization test

This test tests that an alert that is serialized in and out of json is the same alert.

Original commit: elastic/x-pack-elasticsearch@58cdc6d784

src/test/java/org/elasticsearch/alerts/TestAlertSerialization.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+package org.elasticsearch.alerts;
+
+import org.elasticsearch.action.search.SearchRequest;
+import org.elasticsearch.alerts.actions.AlertAction;
+import org.elasticsearch.alerts.triggers.ScriptedTrigger;
+import org.elasticsearch.common.joda.time.DateTime;
+import org.elasticsearch.common.xcontent.ToXContent;
+import org.elasticsearch.common.xcontent.XContentBuilder;
+import org.elasticsearch.common.xcontent.XContentFactory;
+import org.elasticsearch.test.ElasticsearchIntegrationTest;
+import org.junit.Test;
+
+import java.util.ArrayList;
+
+public class TestAlertSerialization extends ElasticsearchIntegrationTest {
+
+    @Test
+    public void testAlertSerialization() throws Exception {
+        Alert alert = new Alert("test-serialization",
+                new SearchRequest(),
+                new ScriptedTrigger("return true", null, null),
+                new ArrayList<AlertAction>(), "0/5 * * * * ? *",
+                new DateTime(),
+                0,
+                false);
+
+        XContentBuilder jsonBuilder = XContentFactory.jsonBuilder();
+        alert.toXContent(jsonBuilder, ToXContent.EMPTY_PARAMS);
+
+        final AlertsStore alertsStore =
+                internalCluster().getInstance(AlertsStore.class, internalCluster().getMasterName());
+
+        Alert parsedAlert = alertsStore.parseAlert("test-serialization", jsonBuilder.bytes());
+        assertEquals(parsedAlert, alert);
+    }
+
+}