fix DECR spec

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

@@ -1,19 +1,22 @@
 import { strict as assert } from 'assert';
 import testUtils, { GLOBAL } from '../test-utils';
-import { transformArguments } from './DECR';
+import DECR from './DECR';
 
 describe('DECR', () => {
-    it('transformArguments', () => {
-        assert.deepEqual(
-            transformArguments('key'),
-            ['DECR', 'key']
-        );
-    });
+  it('transformArguments', () => {
+    assert.deepEqual(
+      DECR.transformArguments('key'),
+      ['DECR', 'key']
+    );
+  });
 
-    testUtils.testWithClient('client.decr', async client => {
-        assert.equal(
-            await client.decr('key'),
-            -1
-        );
-    }, GLOBAL.SERVERS.OPEN);
+  testUtils.testAll('decr', async client => {
+    assert.equal(
+      await client.decr('key'),
+      -1
+    );
+  }, {
+    client: GLOBAL.SERVERS.OPEN,
+    cluster: GLOBAL.CLUSTERS.OPEN
+  });
 });