implement some GEO commands, improve scan generic transformer, expose RPUSHX

lib/commands/GEODIST.spec.ts

@@ -0,0 +1,26 @@
+import { strict as assert } from 'assert';
+import { TestRedisServers, itWithClient, TestRedisClusters, itWithCluster } from '../test-utils';
+import { transformArguments } from './GEODIST';
+
+describe('GEODIST', () => {
+    it('transformArguments', () => {
+        assert.deepEqual(
+            transformArguments('key', '1', '2'),
+            ['GEODIST', 'key', '1', '2']
+        );
+    });
+
+    itWithClient(TestRedisServers.OPEN, 'client.geoDist', async client => {
+        assert.equal(
+            await client.geoDist('key', '1', '2'),
+            null
+        );
+    });
+
+    itWithCluster(TestRedisClusters.OPEN, 'cluster.geoDist', async cluster => {
+        assert.equal(
+            await cluster.geoDist('key', '1', '2'),
+            null
+        );
+    });
+});