VIA-630 MD/DB Redirect user to service failure page if age unknown on hub page

Restores changes from 70350c7, moved up a layer to the hub page itself
so that the age based card component will still continue to load for the
other age ranges that have not been implemented yet (returns empty
element but still allows the hub to be loaded).

It was considered whether the error should be thrown in the session loader
instead and let the default existing error handling run; however this
redirects the user back to NHS app, which was not the required behaviour
for the age based hub feature.

Author: donna-belsey-nhs

src/app/check-and-book-vaccinations/page.test.tsx

@@ -6,6 +6,11 @@ import { AgeGroup } from "@src/models/ageBasedHub";
 import { NhsNumber } from "@src/models/vaccine";
 import { render, screen } from "@testing-library/react";
 import { Session } from "next-auth";
+import { redirect } from "next/navigation";
+
+jest.mock("next/navigation", () => ({
+  redirect: jest.fn(),
+}));
 
 jest.mock("@src/app/_components/nhs-app/BackToNHSAppLink");
 
@@ -67,6 +72,17 @@ describe("Vaccination Hub Page", () => {
       );
     });
 
+    it("should redirect to service failure page if user age unknown", async () => {
+      (auth as jest.Mock).mockResolvedValue(mockSessionDataForAgeGroup(AgeGroup.UNKNOWN_AGE_GROUP));
+
+      try {
+        render(await VaccinationsHub());
+      } catch {
+        expect(redirect).toHaveBeenCalledTimes(1);
+        expect(redirect).toHaveBeenCalledWith("/service-failure");
+      }
+    });
+
     it("should show at risk expander ", () => {
       const atRiskHubExpander: HTMLElement = screen.getByTestId("at-risk-hub-expander");
       expect(atRiskHubExpander).toBeVisible();
@@ -84,22 +100,22 @@ describe("Vaccination Hub Page", () => {
   });
 
   describe("pregnancy hub content", () => {
-    it.each([
-      { description: "hide", ageGroup: AgeGroup.AGE_65_to_74, shouldShowPregnancyContent: false },
-      { description: "show", ageGroup: AgeGroup.UNKNOWN_AGE_GROUP, shouldShowPregnancyContent: true },
-    ])(`$ageGroup should $description pregnancy content`, async ({ ageGroup, shouldShowPregnancyContent }) => {
-      (auth as jest.Mock).mockResolvedValue(mockSessionDataForAgeGroup(ageGroup));
-
-      render(await VaccinationsHub());
-
-      const pregnancyHubContent: HTMLElement | null = screen.queryByTestId("pregnancy-hub-content");
-
-      if (shouldShowPregnancyContent) {
-        expect(pregnancyHubContent).toBeVisible();
-      } else {
-        expect(pregnancyHubContent).toBeNull();
-      }
-    });
+    it.each([{ description: "hide", ageGroup: AgeGroup.AGE_65_to_74, shouldShowPregnancyContent: false }])(
+      `$ageGroup should $description pregnancy content`,
+      async ({ ageGroup, shouldShowPregnancyContent }) => {
+        (auth as jest.Mock).mockResolvedValue(mockSessionDataForAgeGroup(ageGroup));
+
+        render(await VaccinationsHub());
+
+        const pregnancyHubContent: HTMLElement | null = screen.queryByTestId("pregnancy-hub-content");
+
+        if (shouldShowPregnancyContent) {
+          expect(pregnancyHubContent).toBeVisible();
+        } else {
+          expect(pregnancyHubContent).toBeNull();
+        }
+      },
+    );
   });
 });
 

src/app/check-and-book-vaccinations/page.tsx

@@ -10,13 +10,18 @@ import { NHS_TITLE_SUFFIX, SERVICE_HEADING } from "@src/app/constants";
 import { AgeBasedHubDetails, AgeBasedHubInfo, AgeGroup } from "@src/models/ageBasedHub";
 import { Session } from "next-auth";
 import Link from "next/link";
+import { redirect } from "next/navigation";
 import React from "react";
 
 const VaccinationsHub = async () => {
   // TODO: VIA-630 add missing request scoped storage wrapper. Check other new pages and add as required
 
   const session: Session | null = await auth();
   const ageGroup: AgeGroup = session?.user.age_group as AgeGroup;
+  if (ageGroup === AgeGroup.UNKNOWN_AGE_GROUP) {
+    redirect("/service-failure");
+  }
+
   const hubInfoForAgeGroup: AgeBasedHubDetails | undefined = AgeBasedHubInfo[ageGroup];
 
   return (