diff --git a/packages/core/src/submodules/httpAuthSchemes/aws_sdk/resolveAwsSdkSigV4Config.spec.ts b/packages/core/src/submodules/httpAuthSchemes/aws_sdk/resolveAwsSdkSigV4Config.spec.ts
new file mode 100644
index 000000000000..3f3b1a5fabb8
--- /dev/null
+++ b/packages/core/src/submodules/httpAuthSchemes/aws_sdk/resolveAwsSdkSigV4Config.spec.ts
@@ -0,0 +1,44 @@
+import { AwsCredentialIdentityProvider, IdentityProvider } from "@smithy/types";
+import { describe, expect, test as it, vi } from "vitest";
+
+import { resolveAwsSdkSigV4Config } from "./resolveAwsSdkSigV4Config";
+
+describe(resolveAwsSdkSigV4Config.name, () => {
+  it("should allow one argument to be passed to the resolved credentials function", async () => {
+    const fn = vi.fn();
+
+    const myCredentialsProvider: AwsCredentialIdentityProvider = async (arg) => {
+      fn(arg);
+      return {
+        accessKeyId: "",
+        secretAccessKey: "",
+      };
+    };
+
+    const input = {
+      credentials: myCredentialsProvider,
+      region: "us-east-1",
+      sha256: vi.fn(),
+      serviceId: "",
+      useDualstackEndpoint: async () => false,
+      useFipsEndpoint: async () => false,
+    };
+
+    const config = resolveAwsSdkSigV4Config(input);
+
+    const arg = {
+      forceRefresh: true,
+      a: "a",
+      b: "b",
+      [Math.random()]: Math.random(),
+    };
+
+    await config.credentials(arg);
+    expect(fn).toHaveBeenCalledWith(expect.objectContaining(arg));
+    // todo: callerClientConfig should be `config` after https://github.com/aws/aws-sdk-js-v3/pull/6959.
+    // expect(fn).toHaveBeenCalledWith({
+    //   ...arg,
+    //   callerClientConfig: input,
+    // });
+  });
+});