Add test case for listBlobsFlat - for loop syntax

sdk/storage/storage-blob/test/containerclient.spec.ts

@@ -222,7 +222,7 @@ describe("ContainerClient", () => {
     }
   });
 
-  it("Verify AsyncIterator for listBlobsFlat", async () => {
+  it("Verify AsyncIterator(generator .next() syntax) for listBlobsFlat", async () => {
     const blobClients = [];
     const prefix = "blockblob";
     const metadata = {
@@ -256,6 +256,38 @@ describe("ContainerClient", () => {
     }
   });
 
+  it("Verify AsyncIterator(for-loop syntax) for listBlobsFlat", async () => {
+    const blobClients = [];
+    const prefix = "blockblob";
+    const metadata = {
+      keya: "a",
+      keyb: "c"
+    };
+    for (let i = 0; i < 4; i++) {
+      const blobClient = containerClient.createBlobClient(getUniqueName(`${prefix}/${i}`));
+      const blockBlobClient = blobClient.createBlockBlobClient();
+      await blockBlobClient.upload("", 0, {
+        metadata
+      });
+      blobClients.push(blobClient);
+    }
+
+    let i = 0;
+    for await (const blob of containerClient.listBlobsFlat({
+      include: ["snapshots", "metadata", "uncommittedblobs", "copy", "deleted"],
+      prefix,
+      maxresults: 2
+    })) {
+      assert.ok(blobClients[i].url.indexOf(blob.name));
+      assert.deepStrictEqual(blob.metadata, metadata);
+      i++;
+    }
+
+    for (const blob of blobClients) {
+      await blob.delete();
+    }
+  });
+
   it("listBlobHierarchySegment with default parameters", async () => {
     const blobClients = [];
     for (let i = 0; i < 3; i++) {