Add connectivity test for async

JAVA-3038

Author: jyemin

.evergreen/run-connectivity-tests.sh

@@ -24,4 +24,5 @@ export JAVA_HOME="/opt/java/jdk9"
 
 for MONGODB_URI in $@; do
     ./gradlew -PjdkHome=/opt/java/${JDK} -Dorg.mongodb.test.uri=${MONGODB_URI} --stacktrace --info -Dtest.single=ConnectivityTest --rerun-tasks driver-sync:test
+    ./gradlew -PjdkHome=/opt/java/${JDK} -Dorg.mongodb.test.uri=${MONGODB_URI} --stacktrace --info -Dtest.single=ConnectivityTest --rerun-tasks driver-async:test
 done

driver-async/src/test/functional/com/mongodb/async/client/ConnectivityTest.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2008-present MongoDB, Inc.
+ *
+ * Licensed 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 com.mongodb.async.client;
+
+import com.mongodb.async.FutureResultCallback;
+import org.bson.Document;
+import org.junit.Test;
+
+import java.util.concurrent.TimeUnit;
+
+public class ConnectivityTest {
+    // the test succeeds if no exception is thrown, and fail otherwise
+    @Test
+    public void testConnectivity() throws InterruptedException {
+        MongoClient client = MongoClients.create(Fixture.getMongoClientSettings());
+
+        try {
+            FutureResultCallback<Document> commandCallback = new FutureResultCallback<Document>();
+            // test that a command that doesn't require auth completes normally
+            client.getDatabase("admin").runCommand(new Document("ismaster", 1), commandCallback);
+
+            commandCallback.get(10, TimeUnit.SECONDS);
+
+            FutureResultCallback<Long> countCallback = new FutureResultCallback<Long>();
+
+            // test that a command that requires auth completes normally
+            client.getDatabase("test").getCollection("test").estimatedDocumentCount(countCallback);
+
+            countCallback.get(10, TimeUnit.SECONDS);
+        } finally {
+            client.close();
+        }
+    }
+
+}