feat: add stub for failover

README.md

@@ -1,4 +1,4 @@
-# ioredis-mock · [![npm](https://img.shields.io/npm/dm/ioredis-mock.svg?style=flat-square)](https://npm-stat.com/charts.html?package=ioredis-mock) [![npm version](https://img.shields.io/npm/v/ioredis-mock.svg?style=flat-square)](https://www.npmjs.com/package/ioredis-mock) [![Redis Compatibility: 50%](https://img.shields.io/badge/redis-50%25-red.svg?style=flat-square)](compat.md) [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg?style=flat-square)](https://github.com/semantic-release/semantic-release)
+# ioredis-mock · [![npm](https://img.shields.io/npm/dm/ioredis-mock.svg?style=flat-square)](https://npm-stat.com/charts.html?package=ioredis-mock) [![npm version](https://img.shields.io/npm/v/ioredis-mock.svg?style=flat-square)](https://www.npmjs.com/package/ioredis-mock) [![Redis Compatibility: 51%](https://img.shields.io/badge/redis-51%25-red.svg?style=flat-square)](compat.md) [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg?style=flat-square)](https://github.com/semantic-release/semantic-release)
 
 This library emulates [ioredis](https://github.com/luin/ioredis) by performing
 all operations in-memory. The best way to do integration testing against redis

compat.md

@@ -1,4 +1,4 @@
-## Supported commands ![Commands Coverage: 50%](https://img.shields.io/badge/coverage-50%25-red.svg)
+## Supported commands ![Commands Coverage: 51%](https://img.shields.io/badge/coverage-51%25-red.svg)
 
 | redis                  |      ioredis       |    ioredis-mock    |
 | ---------------------- | :----------------: | :----------------: |
@@ -35,7 +35,7 @@
 | [exists]               | :white_check_mark: | :white_check_mark: |
 | [expire]               | :white_check_mark: | :white_check_mark: |
 | [expireat]             | :white_check_mark: | :white_check_mark: |
-| [failover]             | :white_check_mark: |        :x:         |
+| [failover]             | :white_check_mark: | :white_check_mark: |
 | [flushall]             | :white_check_mark: | :white_check_mark: |
 | [flushdb]              | :white_check_mark: | :white_check_mark: |
 | [geoadd]               | :white_check_mark: |        :x:         |

src/commands/failover.js

@@ -0,0 +1,8 @@
+export function failover() {
+  throw new Error('ERR FAILOVER requires connected replicas.')
+}
+
+export function failoverBuffer(...args) {
+  const val = failover.apply(this, args)
+  return val ? Buffer.from(val) : val
+}

src/commands/index.js

@@ -18,6 +18,7 @@ export * from './evalsha'
 export * from './exists'
 export * from './expire'
 export * from './expireat'
+export * from './failover'
 export * from './flushall'
 export * from './flushdb'
 export * from './get'

test/integration/commands/failover.js

@@ -0,0 +1,21 @@
+import Redis from 'ioredis'
+
+// eslint-disable-next-line import/no-relative-parent-imports
+import { runTwinSuite } from '../../../test-utils'
+
+runTwinSuite('failover', command => {
+  describe(command, () => {
+    it('should throw an error when no replicas are connected', async () => {
+      const redis = new Redis()
+      expect.hasAssertions()
+
+      try {
+        await redis[command]()
+      } catch (err) {
+        expect(err.message).toBe('ERR FAILOVER requires connected replicas.')
+      }
+
+      redis.disconnect()
+    })
+  })
+})