Add some errors for testing

src/neo4j-linker.ts

@@ -17,7 +17,6 @@ export class Linker {
         nconf.get('neo4j:config:password'),
       ),
     );
-
   }
 
   /**
@@ -47,16 +46,14 @@ export class Linker {
       });
       // get a new session
       this.logger.info('Try to get a session');
+      this.logger.info(query);
       const session = this.driver.session();
       this.logger.info('Try to build network');
       session.run(query).then(() => {
         session.close();
         resolve();
       }).catch((err) => {
-        setTimeout(() => {
-          session.close();
-          reject(`Error while saving a connection to neo4j ${JSON.stringify(err)}`);
-        }, 500);
+        throw err;
       });
     });