Prohibit TRUST_ON_FIRST_USE + routing

It does not make much sense with cluster where logical cluster members can be
moved from one machine to another.

Author: lutovich

src/v1/routing-driver.js

@@ -30,7 +30,7 @@ import Integer from './integer'
 class RoutingDriver extends Driver {
 
   constructor(url, userAgent, token = {}, config = {}) {
-    super(url, userAgent, token, config);
+    super(url, userAgent, token, RoutingDriver._validateConfig(config));
     this._clusterView = new ClusterView(new RoundRobinArray([url]));
   }
 
@@ -148,6 +148,13 @@ class RoutingDriver extends Driver {
     this._pool.purge(url);
     this._clusterView.remove(url);
   }
+
+  static _validateConfig(config) {
+    if(config.trust === 'TRUST_ON_FIRST_USE') {
+      throw newError('The chosen trust mode is not compatible with a routing driver');
+    }
+    return config;
+  }
 }
 
 class ClusterView {

test/v1/driver.test.js

@@ -152,6 +152,17 @@ describe('driver', function() {
     routingDriver.close();
   });
 
+  it('should fail when TRUST_ON_FIRST_USE is used with routing', () => {
+    const createRoutingDriverWithTOFU = () => {
+      driver = neo4j.driver('bolt+routing://localhost', neo4j.auth.basic('neo4j', 'neo4j'), {
+        encrypted: "ENCRYPTION_ON",
+          trust: 'TRUST_ON_FIRST_USE'
+      });
+    };
+
+    expect(createRoutingDriverWithTOFU).toThrow();
+  });
+
   var exposedTypes = [
     'Node',
     'Path',