fix #2 RedisGraph constructor can get a node_redis client

Author: gkorland

package.json

@@ -13,5 +13,8 @@
 	},
 	"devDependencies": {
 		"mocha": "^5.2.0"
+	},
+	"scripts": {
+		"test": "mocha"
 	}
 }

src/redisGraph.js

@@ -12,15 +12,16 @@ module.exports = class RedisGraph {
 	 * See: node_redis for more options on createClient 
 	 *
 	 * @param graphId the graph id
-	 * @param host Redis host
+	 * @param host Redis host or node_redis client
 	 * @param port Redis port
+	 * @param options node_redis options
 	 */
 	constructor(graphId, host, port, options) {
-		this._graphId = graphId;
-		let client = redis.createClient.apply(redis, [].slice.call(arguments,1));
+		this._graphId = graphId;		
+		let client = (host instanceof redis.RedisClient) ? host : redis.createClient.apply(redis, [].slice.call(arguments,1)); 
 		this._sendCommand = util.promisify(client.send_command).bind(client);
 	}
-
+	
 	/**
 	 * Execute a Cypher query
 	 * 

test/redisGraphAPITest.js

@@ -1,4 +1,5 @@
 const assert = require('assert'),
+redis = require('redis'),
 Label = require('../src/statistics').Label,
 RedisGraphAPI = require('../src/redisGraph');
 
@@ -9,6 +10,10 @@ describe('RedisGraphAPI Test', () =>{
 		return api.deleteGraph();
 	});
 
+	it('test bring your client', () => {
+		return new RedisGraphAPI( "social", redis.createClient());
+	});
+	
 	it('test Create Node', () => {
 		// Create a node    	
 		return api.query("CREATE ({name:'roi',age:32})")
@@ -79,4 +84,4 @@ describe('RedisGraphAPI Test', () =>{
 			assert.equal( "32.000000", record.getString(0));
 		});
 	});
-}) 
+});