[misc] add scripts for testing redis cluster

libraries/redis-wrapper/test/scripts/cluster/cluster.js

@@ -0,0 +1,25 @@
+/*
+  execute this script with a redis cluster running to test the health check.
+  starting and stopping shards with this script running is a good test.
+
+  to create a new cluster, use $ ./create-redis-cluster.sh
+  to run a chaos monkey, use $ ./clear-dbs.sh
+*/
+
+const redis = require('../../../')
+
+const rclient = redis.createClient({
+  cluster: Array.from({ length: 9 }).map((value, index) => {
+    return { host: '127.0.0.1', port: 7000 + index }
+  }),
+})
+
+setInterval(() => {
+  rclient.healthCheck((err) => {
+    if (err) {
+      console.log('HEALTH CHECK FAILED', err)
+    } else {
+      console.log('HEALTH CHECK OK')
+    }
+  })
+}, 1000)