Add test case for accessTierInferred (#375)

tests/blob/apis/blob.test.ts

@@ -426,14 +426,38 @@ describe("BlobAPIs", () => {
   });
 
   it("setTier set default to cool @loki @sql", async () => {
+    // Created Blob should have accessTierInferred as true in Get/list
+    let properties = await blockBlobURL.getProperties(Aborter.none);
+    assert.equal(properties.accessTier!.toLowerCase(), "hot");
+    assert.equal(true, properties.accessTierInferred);
+
+    let listResult = containerURL.listBlobFlatSegment(Aborter.none, undefined, {
+      prefix: blobName
+    });
+    assert.equal(
+      true,
+      (await listResult).segment.blobItems[0].properties.accessTierInferred
+    );
+
     const result = await blockBlobURL.setTier(Aborter.none, "Cool");
     assert.equal(
       result._response.request.headers.get("x-ms-client-request-id"),
       result.clientRequestId
     );
 
-    const properties = await blockBlobURL.getProperties(Aborter.none);
+    // After setTier, Blob should have accessTierInferred as false in Get
+    properties = await blockBlobURL.getProperties(Aborter.none);
     assert.equal(properties.accessTier!.toLowerCase(), "cool");
+    assert.equal(false, properties.accessTierInferred);
+
+    // After setTier, Blob should have accessTierInferred as undefined in list
+    listResult = containerURL.listBlobFlatSegment(Aborter.none, undefined, {
+      prefix: blobName
+    });
+    assert.equal(
+      undefined,
+      (await listResult).segment.blobItems[0].properties.accessTierInferred
+    );
   });
 
   it("setTier set archive to hot @loki @sql", async () => {