fix timeout

packages/datadog-plugin-mongodb-core/test/mongodb.spec.js

@@ -386,7 +386,11 @@
             .then(done)
             .catch(done)
 
-          collection.insertOne({ a: 1 }, {}, () => {})
+          collection.find({
+            _id: Buffer.from('1234')
+          }).toArray()
+          .then(done)
+          .catch(done)
         })
       })
 
@@ -440,9 +444,11 @@
             .then(done)
             .catch(done)
 
-            collection.find({
-              _id: Buffer.from('1234')
-            }).toArray()
+          collection.find({
+            _id: Buffer.from('1234')
+          }).toArray()
+            .then(done)
+            .catch(done)
         })
       })
     })