Replaced legacy InitialDnsSeedlistTest with a connectivity test

JAVA-3251

Author: rozza

.evergreen/.evg.yml

@@ -303,8 +303,8 @@ functions:
         working_dir: "src"
         script: |
           # DO NOT ECHO WITH XTRACE (which PREPARE_SHELL does)
-          JDK="jdk8" .evergreen/run-connectivity-tests.sh '${atlas_free_tier_uri}' '${atlas_replica_set_uri}' '${atlas_sharded_uri}' '${atlas_tls_v11_uri}' '${atlas_tls_v12_uri}'
- 
+          JDK="jdk8" .evergreen/run-connectivity-tests.sh '${atlas_free_tier_uri}' '${atlas_replica_set_uri}' '${atlas_sharded_uri}' '${atlas_tls_v11_uri}' '${atlas_tls_v12_uri}' '${atlas_free_tier_uri_srv}' '${atlas_replica_set_uri_srv}' '${atlas_sharded_uri_srv}' '${atlas_tls_v11_uri_srv}' '${atlas_tls_v12_uri_srv}'
+
   "publish snapshot":
     - command: shell.exec
       type: test

.evergreen/run-connectivity-tests.sh

@@ -25,4 +25,5 @@ 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=${MONGODB_URI} --stacktrace --info -Dtest.single=ConnectivityTest --rerun-tasks driver-async:test
+    ./gradlew -PjdkHome=/opt/java/${JDK} -Dorg.mongodb.test.uri=${MONGODB_URI} --stacktrace --info -Dtest.single=ConnectivityTest --rerun-tasks driver-legacy:test
 done

driver-legacy/src/test/functional/com/mongodb/ConnectivityTest.java

@@ -0,0 +1,39 @@
+/*
+ * 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;
+
+import org.bson.Document;
+import org.junit.Test;
+
+public class ConnectivityTest {
+
+    // the test succeeds if no exception is thrown, and fail otherwise
+    @Test
+    public void testConnectivity() {
+        MongoClient client = Fixture.getMongoClient();
+
+        try {
+            // test that a command that doesn't require auth completes normally
+            client.getDatabase("admin").runCommand(new Document("ismaster", 1));
+
+            // test that a command that requires auth completes normally
+            client.getDatabase("test").getCollection("test").estimatedDocumentCount();
+        } finally {
+            client.close();
+        }
+    }
+}