Support COMMAND GETKEYSANDFLAGS (#2039)

* Support COMMAND GETKEYSANDFLAGS

* Update COMMAND_GETKEYSANDFLAGS.spec.ts

remove '.only'

* clean code

Co-authored-by: leibale <leibale1998@gmail.com>

packages/client/lib/commands/COMMAND_GETKEYSANDFLAGS.spec.ts

@@ -0,0 +1,24 @@
+import { strict as assert } from 'assert';
+import testUtils, { GLOBAL } from '../test-utils';
+import { transformArguments } from './COMMAND_GETKEYSANDFLAGS';
+
+describe('COMMAND GETKEYSANDFLAGS', () => {
+    testUtils.isVersionGreaterThanHook([7, 0]);
+
+    it('transformArguments', () => {
+        assert.deepEqual(
+            transformArguments(['GET', 'key']),
+            ['COMMAND', 'GETKEYSANDFLAGS', 'GET', 'key']
+        );
+    });
+
+    testUtils.testWithClient('client.commandGetKeysAndFlags', async client => {
+        assert.deepEqual(
+            await client.commandGetKeysAndFlags(['GET', 'key']),
+            [{
+                key: 'key',
+                flags: ['RO', 'access']
+            }]
+        );
+    }, GLOBAL.SERVERS.OPEN);
+});