Address feedback from review

src/io/deviceManager.js

@@ -319,7 +319,7 @@ class DeviceManager {
                 json: {}
             }, (err, res, body) => {
                 if (err) return reject(err);
-                if (res.statusCode !== 200) reject(body);
+                if (res.statusCode !== 200) return reject(body);
                 resolve(body);
             });
         });

test/unit/io_deviceManager.js

@@ -24,11 +24,16 @@ test('list', t => {
     const deviceManager = new DeviceManager();
     deviceManager
         .list('test', 'test', null)
-        .catch(err => {
+        .then(
-            t.true((typeof err === 'undefined') || (typeof err === 'object'));
+            body => {
-        })
+                // SDM is running
-        .then(body => {
+                t.type(body, 'object');
-            t.true((typeof body === 'undefined') || (typeof body === 'object'));
+                t.end();
-            t.end();
+            },
-        });
+            err => {
+                // If SDM is not running error is expected, continue
+                t.true(typeof err === 'object' || typeof err === 'undefined');
+                t.end();
+            }
+        );
 });