test: add middleware in flexChecks step

Author: trivikr

packages/middleware-flexible-checksums/src/middleware-flexible-checksums.retry.integ.spec.ts

@@ -2,6 +2,8 @@ import { S3 } from "@aws-sdk/client-s3";
 import { HttpResponse } from "@smithy/protocol-http";
 import { describe, expect, test as it } from "vitest";
 
+import { flexibleChecksumsMiddlewareOptions } from "./flexibleChecksumsMiddleware";
+
 describe("middleware-flexible-checksums.retry", () => {
   it("retry reuses the checksum", async () => {
     const maxAttempts = 3;
@@ -24,10 +26,9 @@ describe("middleware-flexible-checksums.retry", () => {
         return next(args);
       };
     }
-    client.middlewareStack.addRelativeTo(flexChecksCallCountMiddleware, {
+    client.middlewareStack.add(flexChecksCallCountMiddleware, {
       name: flexChecksCallCountMiddleware.name,
-      toMiddleware: "flexibleChecksumsMiddleware",
-      relation: "after",
+      step: flexibleChecksumsMiddlewareOptions.step,
     });
 
     client.middlewareStack.identifyOnResolve(true);