add a basic cluster info IT to the found qa module

Original commit: elastic/x-pack-elasticsearch@8f6334ef2b

qa/smoke-test-found-license-with-shield-and-watcher/src/test/java/org/elasticsearch/smoketest/MarvelClusterInfoIT.java

@@ -0,0 +1,102 @@
+/*
+ * 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.smoketest;
+
+import org.elasticsearch.Version;
+import org.elasticsearch.action.get.GetResponse;
+import org.elasticsearch.common.Strings;
+import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.index.IndexNotFoundException;
+import org.elasticsearch.plugins.Plugin;
+import org.elasticsearch.shield.ShieldPlugin;
+import org.elasticsearch.test.ESIntegTestCase;
+import org.hamcrest.Matcher;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.nullValue;
+
+public class MarvelClusterInfoIT extends ESIntegTestCase {
+
+    static final String ADMIN_USER_PW = "test_admin:changeme";
+
+    @Override
+    protected Settings externalClusterClientSettings() {
+        return Settings.builder()
+                .put("shield.user", ADMIN_USER_PW)
+                .build();
+    }
+
+    @Override
+    protected Collection<Class<? extends Plugin>> transportClientPlugins() {
+        return Collections.singletonList(ShieldPlugin.class);
+    }
+
+    public void testMarvelClusterInfoCollectorWorks() throws Exception {
+        final String clusterUUID = client().admin().cluster().prepareState().setMetaData(true).get().getState().metaData().clusterUUID();
+        assertTrue(Strings.hasText(clusterUUID));
+        awaitIndexExists(".marvel-es-data");
+        ensureMarvelIndicesGreen();
+        awaitMarvelDocsCount(equalTo(1L), "cluster_info");
+        GetResponse response = client().prepareGet(".marvel-es-data", "cluster_info", clusterUUID).get();
+        assertTrue(".marvel-es-data" + " document does not exist", response.isExists());
+        Map<String, Object> source = response.getSource();
+        assertThat((String) source.get("cluster_name"), equalTo(cluster().getClusterName()));
+        assertThat((String) source.get("version"), equalTo(Version.CURRENT.toString()));
+
+        Object licenseObj = source.get("license");
+        assertThat(licenseObj, nullValue());
+    }
+
+    protected void ensureMarvelIndicesGreen() {
+        try {
+            ensureGreen(".marvel-es-*");
+        } catch (IndexNotFoundException e) {
+            // might happen with shield...
+        }
+    }
+
+    protected void awaitMarvelDocsCount(Matcher<Long> matcher, String... types) throws Exception {
+        flush();
+        refresh();
+        assertBusy(new Runnable() {
+            @Override
+            public void run() {
+                assertMarvelDocsCount(matcher, types);
+            }
+        }, 30, TimeUnit.SECONDS);
+    }
+
+    protected void assertMarvelDocsCount(Matcher<Long> matcher, String... types) {
+        try {
+            long count = client().prepareSearch(".marvel-es-*").setSize(0)
+                    .setTypes(types).get().getHits().totalHits();
+            logger.trace("--> searched for [{}] documents, found [{}]", Strings.arrayToCommaDelimitedString(types), count);
+            assertThat(count, matcher);
+        } catch (IndexNotFoundException e) {
+            assertThat(0L, matcher);
+        }
+    }
+
+    protected void awaitIndexExists(final String... indices) throws Exception {
+        assertBusy(new Runnable() {
+            @Override
+            public void run() {
+                assertIndicesExists(indices);
+            }
+        }, 30, TimeUnit.SECONDS);
+    }
+
+    protected void assertIndicesExists(String... indices) {
+        logger.trace("checking if index exists [{}]", Strings.arrayToCommaDelimitedString(indices));
+        assertThat(client().admin().indices().prepareExists(indices).get().isExists(), is(true));
+    }
+}