Address comments

Author: minggangw

test/test-publisher.js

@@ -54,6 +54,7 @@ describe('rclnodejs publisher test suite', function () {
 
   it('Test loggerName', function () {
     const node = rclnodejs.createNode('publisher_node');
+    const String = 'std_msgs/msg/String';
     const publisher = node.createPublisher(String, 'topic');
     assert.strictEqual(typeof publisher.loggerName, 'string');
   });

test/test-service.js

@@ -105,7 +105,7 @@ describe('Test service class', function () {
         result.sum = request.a + request.b;
       }
     );
-    const client = clientNode.createClient(AddTwoInts, 'single_ps_channel2');
+    const client = node.createClient(AddTwoInts, 'single_ps_channel2');
 
     assert.strictEqual(typeof service.loggerName, 'string');
     assert.strictEqual(typeof client.loggerName, 'string');

test/test-subscription.js

@@ -38,6 +38,7 @@ describe('rclnodejs subscription test suite', function () {
 
   it('Test loggerName', function () {
     const node = rclnodejs.createNode('publisher_node');
+    const String = 'std_msgs/msg/String';
     const subscription = node.createSubscription(String, 'topic', (msg) => {});
     assert.strictEqual(typeof subscription.loggerName, 'string');
   });