feat: add stub for readwrite

compat.md

@@ -113,7 +113,7 @@
 | [quit]                 | :white_check_mark: | :white_check_mark: |
 | [randomkey]            | :white_check_mark: | :white_check_mark: |
 | [readonly]             | :white_check_mark: | :white_check_mark: |
-| [readwrite]            | :white_check_mark: |        :x:         |
+| [readwrite]            | :white_check_mark: | :white_check_mark: |
 | [rename]               | :white_check_mark: | :white_check_mark: |
 | [renamenx]             | :white_check_mark: | :white_check_mark: |
 | [replconf]             | :white_check_mark: | :white_check_mark: |

src/commands/index.js

@@ -71,6 +71,7 @@ export * from './punsubscribe'
 export * from './quit'
 export * from './randomkey'
 export * from './readonly'
+export * from './readwrite'
 export * from './rename'
 export * from './renamenx'
 export * from './replconf'

src/commands/readwrite.js

@@ -0,0 +1,8 @@
+export function readwrite() {
+  return 'OK'
+}
+
+export function readwriteBuffer() {
+  const val = readwrite.call(this)
+  return val ? Buffer.from(val) : val
+}

test/integration/commands/readwrite.js

@@ -0,0 +1,16 @@
+import Redis from 'ioredis'
+
+// eslint-disable-next-line import/no-relative-parent-imports
+import { runTwinSuite } from '../../../test-utils'
+
+runTwinSuite('readwrite', (command, equals) => {
+  describe(command, () => {
+    it('should return OK', async () => {
+      const redis = new Redis()
+
+      expect(equals(await redis[command](), 'OK')).toBe(true)
+
+      redis.disconnect()
+    })
+  })
+})