VIA-171 Remove unnecessary navigation mock from page tests

With the back-link component mocked out useRouter is no longer called
during the unit tests

Author: donna-belsey-nhs

src/app/schedule/page.test.tsx

@@ -1,14 +1,12 @@
 import { render, screen } from "@testing-library/react";
 import Schedule from "./page";
 import { JSX } from "react";
+import { assertBackLinkIsPresent } from "@test-data/test-helpers-back-link";
 
 jest.mock("@src/app/_components/nhs-frontend/BackLink", () =>
   jest.fn(() => <div data-testid="back-link"></div>),
 );
 jest.mock("@src/services/content-api/gateway/content-reader-service");
-jest.mock("next/navigation", () => ({
-  useRouter: jest.fn(),
-}));
 
 describe("Schedule Page", () => {
   beforeEach(() => {
@@ -97,7 +95,6 @@ describe("Schedule Page", () => {
   });
 
   it("should contain back link", () => {
-    const backLink = screen.getByTestId("back-link");
-    expect(backLink).toBeInTheDocument();
+    assertBackLinkIsPresent(screen);
   });
 });

src/app/vaccines/6-in-1/page.test.tsx

@@ -6,9 +6,6 @@ import { mockStyledContent } from "@test-data/content-api/data";
 import { VaccineTypes } from "@src/models/vaccine";
 import { assertBackLinkIsPresent } from "@test-data/test-helpers-back-link";
 
-jest.mock("next/navigation", () => ({
-  useRouter: jest.fn(),
-}));
 jest.mock("@src/services/content-api/gateway/content-reader-service");
 jest.mock("@src/app/_components/vaccine/Vaccine", () => jest.fn(() => <div />));
 jest.mock("@src/app/_components/nhs-frontend/BackLink", () =>

src/app/vaccines/covid-19/page.test.tsx

@@ -6,9 +6,6 @@ import { mockStyledContent } from "@test-data/content-api/data";
 import { VaccineTypes } from "@src/models/vaccine";
 import { assertBackLinkIsPresent } from "@test-data/test-helpers-back-link";
 
-jest.mock("next/navigation", () => ({
-  useRouter: jest.fn(),
-}));
 jest.mock("@src/services/content-api/gateway/content-reader-service");
 jest.mock("@src/app/_components/vaccine/Vaccine", () => jest.fn(() => <div />));
 jest.mock("@src/app/_components/nhs-frontend/BackLink", () =>

src/app/vaccines/flu/page.test.tsx

@@ -6,9 +6,6 @@ import { mockStyledContent } from "@test-data/content-api/data";
 import { VaccineTypes } from "@src/models/vaccine";
 import { assertBackLinkIsPresent } from "@test-data/test-helpers-back-link";
 
-jest.mock("next/navigation", () => ({
-  useRouter: jest.fn(),
-}));
 jest.mock("@src/services/content-api/gateway/content-reader-service");
 jest.mock("@src/app/_components/vaccine/Vaccine");
 jest.mock("@src/app/_components/nhs-frontend/BackLink", () =>

src/app/vaccines/menacwy/page.test.tsx

@@ -6,9 +6,6 @@ import { VaccineTypes } from "@src/models/vaccine";
 import VaccineMenACWY from "@src/app/vaccines/menacwy/page";
 import { assertBackLinkIsPresent } from "@test-data/test-helpers-back-link";
 
-jest.mock("next/navigation", () => ({
-  useRouter: jest.fn(),
-}));
 jest.mock("@src/services/content-api/gateway/content-reader-service");
 jest.mock("@src/app/_components/vaccine/Vaccine");
 jest.mock("@src/app/_components/nhs-frontend/BackLink", () =>

src/app/vaccines/pneumococcal/page.test.tsx

@@ -6,9 +6,6 @@ import { VaccineTypes } from "@src/models/vaccine";
 import VaccinePneumococcal from "@src/app/vaccines/pneumococcal/page";
 import { assertBackLinkIsPresent } from "@test-data/test-helpers-back-link";
 
-jest.mock("next/navigation", () => ({
-  useRouter: jest.fn(),
-}));
 jest.mock("@src/services/content-api/gateway/content-reader-service");
 jest.mock("@src/app/_components/vaccine/Vaccine");
 jest.mock("@src/app/_components/nhs-frontend/BackLink", () =>

src/app/vaccines/rsv/page.test.tsx

@@ -6,9 +6,6 @@ import { mockStyledContent } from "@test-data/content-api/data";
 import { VaccineTypes } from "@src/models/vaccine";
 import { assertBackLinkIsPresent } from "@test-data/test-helpers-back-link";
 
-jest.mock("next/navigation", () => ({
-  useRouter: jest.fn(),
-}));
 jest.mock("@src/services/content-api/gateway/content-reader-service");
 jest.mock("@src/app/_components/vaccine/Vaccine", () => jest.fn(() => <div />));
 jest.mock("@src/app/_components/nhs-frontend/BackLink", () =>

src/app/vaccines/shingles/page.test.tsx

@@ -6,9 +6,6 @@ import { VaccineTypes } from "@src/models/vaccine";
 import VaccineShingles from "@src/app/vaccines/shingles/page";
 import { assertBackLinkIsPresent } from "@test-data/test-helpers-back-link";
 
-jest.mock("next/navigation", () => ({
-  useRouter: jest.fn(),
-}));
 jest.mock("@src/services/content-api/gateway/content-reader-service");
 jest.mock("@src/app/_components/vaccine/Vaccine");
 jest.mock("@src/app/_components/nhs-frontend/BackLink", () =>