Fix how underlying connection is fetched in the test

Author: ali-ince

test/internal/node/direct.driver.boltkit.test.js

@@ -17,7 +17,7 @@
  * limitations under the License.
  */
 
-import neo4j, { Neo4jError } from '../../../src/v1'
+import neo4j from '../../../src/v1'
 import { READ, WRITE } from '../../../src/v1/driver'
 import boltStub from '../bolt-stub'
 import { newError, SERVICE_UNAVAILABLE } from '../../../src/v1/error'
@@ -447,7 +447,9 @@ describe('direct driver with stub server', () => {
           expect(records[1].get(0)).toBe('Alice')
           expect(records[2].get(0)).toBe('Tina')
 
-          const connection = driver._openConnections[0]
+          expect(Object.keys(driver._openConnections).length).toBe(1)
+
+          const connection = Object.values(driver._openConnections)[0]
           session.close(() => {
             // generate a fake fatal error
             connection._handleFatalError(