fix returnBuffers, add some tests

packages/bloom/lib/commands/cuckoo/LOADCHUNK.spec.ts

@@ -1,4 +1,5 @@
 import { strict as assert } from 'assert';
+import testUtils, { GLOBAL } from '../../test-utils';
 import { transformArguments } from './LOADCHUNK';
 
 describe('CF LOADCHUNK', () => {
@@ -8,4 +9,23 @@ describe('CF LOADCHUNK', () => {
             ['CF.LOADCHUNK', 'item', '0', '']
         );
     });
+
+    testUtils.testWithClient('client.cf.loadChunk', async client => {
+        const [,, { iterator, chunk }] = await Promise.all([
+            client.cf.reserve('source', 4),
+            client.cf.add('source', 'item'),
+            client.cf.scanDump(
+                client.commandOptions({ returnBuffers: true }),
+                'source',
+                0
+            )
+        ]);
+
+        assert.ok(Buffer.isBuffer(chunk));
+
+        assert.equal(
+            await client.cf.loadChunk('destination', iterator, chunk),
+            'OK'
+        );
+    }, GLOBAL.SERVERS.OPEN);
 });

packages/bloom/lib/commands/cuckoo/LOADCHUNK.ts

@@ -1,6 +1,12 @@
+import { RedisCommandArgument, RedisCommandArguments } from '@node-redis/client/dist/lib/commands';
+
 export const FIRST_KEY_INDEX = 1;
 
-export function transformArguments(key: string, iterator: number, chunk: string): Array<string> {
+export function transformArguments(
+    key: string,
+    iterator: number,
+    chunk: RedisCommandArgument
+): RedisCommandArguments {
     return ['CF.LOADCHUNK', key, iterator.toString(), chunk];
 }
 

packages/bloom/lib/commands/cuckoo/SCANDUMP.spec.ts

@@ -1,4 +1,5 @@
 import { strict as assert } from 'assert';
+import testUtils, { GLOBAL } from '../../test-utils';
 import { transformArguments } from './SCANDUMP';
 
 describe('CF SCANDUMP', () => {
@@ -8,4 +9,15 @@ describe('CF SCANDUMP', () => {
             ['CF.SCANDUMP', 'key', '0']
         );
     });
+
+    testUtils.testWithClient('client.cf.scanDump', async client => {
+        await client.cf.reserve('key', 4);
+        assert.deepEqual(
+            await client.cf.scanDump('key', 0),
+            {
+                iterator: 0,
+                chunk: null
+            }
+        );
+    }, GLOBAL.SERVERS.OPEN);
 });

packages/bloom/lib/commands/cuckoo/SCANDUMP.ts

@@ -6,12 +6,12 @@ export function transformArguments(key: string, iterator: number): Array<string>
 
 type ScanDumpRawReply = [
     iterator: number,
-    chunk: string
+    chunk: string | null
 ];
 
 interface ScanDumpReply {
     iterator: number;
-    chunk: string;
+    chunk: string | null;
 }
 
 export function transformReply([iterator, chunk]: ScanDumpRawReply): ScanDumpReply {