add some tests

Author: leibale

packages/client/lib/cluster/index.spec.ts

@@ -23,7 +23,7 @@ describe('Cluster', () => {
     }, GLOBAL.CLUSTERS.OPEN);
 
     testUtils.testWithCluster('connect should throw if already connected', async cluster => {
-        assert.rejects(cluster.connect());
+        await assert.rejects(cluster.connect());
     }, GLOBAL.CLUSTERS.OPEN);
 
     testUtils.testWithCluster('multi', async cluster => {
@@ -165,6 +165,10 @@ describe('Cluster', () => {
         }
     });
 
+    testUtils.testWithCluster('should throw CROSSSLOT error', async cluster => {
+        await assert.rejects(cluster.mGet(['a', 'b']));
+    }, GLOBAL.CLUSTERS.OPEN);
+
     describe('minimizeConnections', () => {
         testUtils.testWithCluster('false', async cluster => {
             for (const master of cluster.masters) {