added comments for response.url

Author: Namitha-Prabhu

tests/component-tests/apiGateway-tests/get-letter-pdf.spec.ts

@@ -51,13 +51,11 @@ test.describe("API Gateway Tests to Verify Get Letter PDF Endpoint", () => {
       };
     }
 
-    const pdfUrl = await response.url();
+    const pdfUrl = await response.url(); //function returns response url though get letter data  will automatically redirect to the url in the Location header.
     const parsed = new URL(pdfUrl);
     const expiresParam = parsed.searchParams.get("X-Amz-Expires");
-
-    expect(expiresParam).toBeTruthy();
     const expiresSeconds = Number(expiresParam);
-    expect(Number.isFinite(expiresSeconds)).toBeTruthy();
+    expect(expiresSeconds).toBe(60);
 
     const waitMs = Math.max(expiresSeconds * 1000 + 2000, 0);
     await new Promise((resolve) => {