add simple unicast disco test on hte node level

modules/test/integration/src/test/java/org/elasticsearch/test/integration/discovery/DiscoveryTests.java

@@ -0,0 +1,54 @@
+/*
+ * Licensed to Elastic Search and Shay Banon under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. Elastic Search 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.test.integration.discovery;
+
+import org.elasticsearch.cluster.ClusterState;
+import org.elasticsearch.common.settings.ImmutableSettings;
+import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.test.integration.AbstractNodesTests;
+import org.testng.annotations.AfterTest;
+import org.testng.annotations.Test;
+
+import static org.hamcrest.MatcherAssert.*;
+import static org.hamcrest.Matchers.*;
+
+@Test
+public class DiscoveryTests extends AbstractNodesTests {
+
+    @AfterTest public void closeNodes() {
+        closeAllNodes();
+    }
+
+    @Test public void testUnicastDiscovery() {
+        Settings settings = ImmutableSettings.settingsBuilder()
+                .put("discovery.zen.multicast.enabled", false)
+                .put("discovery.zen.unicast.hosts", "localhost")
+                .build();
+
+        startNode("node1", settings);
+        startNode("node2", settings);
+
+        ClusterState state = client("node1").admin().cluster().prepareState().execute().actionGet().state();
+        assertThat(state.nodes().size(), equalTo(2));
+
+        state = client("node2").admin().cluster().prepareState().execute().actionGet().state();
+        assertThat(state.nodes().size(), equalTo(2));
+    }
+}