testkit-backend: Implements GetFeatures message (#733)

This command should return the list of features supported by driver as it define in TK.

In the current implementation, the unique feature available is AuthorizationExpiredTreatment

Author: bigmontz

testkit-backend/src/request-handlers.js

@@ -90,7 +90,7 @@ export function SessionRun (context, data, wire) {
     .catch(_ => null)
     .then(_ => {
       const result = session.run(cypher, params, { metadata, timeout })
-      const resultObserver = new ResultObserver({ sessionId })
+      const resultObserver = new ResultObserver({ sessionId, result })
       result.subscribe(resultObserver)
       const id = context.addResultObserver(resultObserver)
       wire.writeResponse('Result', { id })
@@ -159,7 +159,7 @@ export function TransactionRun (context, data, wire) {
     }
   }
   const result = tx.tx.run(cypher, params)
-  const resultObserver = new ResultObserver({})
+  const resultObserver = new ResultObserver({ result })
   result.subscribe(resultObserver)
   const id = context.addResultObserver(resultObserver)
   wire.writeResponse('Result', { id })
@@ -239,6 +239,12 @@ export function StartTest (_, { testName }, wire) {
   })
 }
 
+export function GetFeatures (_context, _params, wire) {
+  wire.writeResponse('FeatureList', {
+    features: ['AuthorizationExpiredTreatment']
+  })
+}
+
 export function VerifyConnectivity (context, { driverId }, wire) {
   const driver = context.getDriver(driverId)
   driver

testkit-backend/src/result-observer.js

@@ -1,8 +1,9 @@
 import neo4j from 'neo4j'
 
 export default class ResultObserver {
-  constructor ({ sessionId }) {
+  constructor ({ sessionId, result }) {
     this.sessionId = sessionId
+    this._result = result
     this.keys = null
     this._stream = []
     this.summary = null