fix(multiple): le bouton retour apparait tout le temps

src/client/components/features/ButtonRetour/BackButton.test.tsx

@@ -0,0 +1,46 @@
+/**
+ * @jest-environment jsdom
+ */
+
+import { render, screen } from '@testing-library/react';
+
+import { BackButton } from '~/client/components/features/ButtonRetour/BackButton';
+import { mockUseRouter } from '~/client/components/useRouter.mock';
+import { mockSessionStorage } from '~/client/components/window.mock';
+
+describe('BackButton', () => {
+	beforeEach(() => {
+		jest.resetAllMocks();
+	});
+
+	describe('Lorsque la variable PREVIOUS_PAGE est définie dans le sessionStorage', () => {
+		it('affiche le bouton de retour', () => {
+			// Given
+			mockUseRouter({});
+			mockSessionStorage({
+				getItem: jest.fn().mockReturnValue('/page-1'),
+			});
+
+			// When
+			render(<BackButton />);
+
+			// Then
+			expect(screen.getByRole('button', { name: 'Retour vers la page précédente' })).toBeInTheDocument();
+		});
+	});
+	describe('Lorsque la variable PREVIOUS_PAGE n’est pas définie dans le sessionStorage', () => {
+		it('n’affiche pas le bouton de retour', () => {
+			// Given
+			mockUseRouter({});
+			mockSessionStorage({
+				getItem: jest.fn().mockReturnValue(null),
+			});
+
+			// When
+			render(<BackButton />);
+
+			// Then
+			expect(screen.queryByRole('button', { name: 'Retour vers la page précédente' })).not.toBeInTheDocument();
+		});
+	});
+});

src/client/components/features/ButtonRetour/BackButton.tsx

@@ -1,34 +1,28 @@
 import { useRouter } from 'next/router';
-import React, { useEffect, useMemo } from 'react';
+import React, { useEffect, useState } from 'react';
 
 import { Container } from '~/client/components/layouts/Container/Container';
 import {
 	ButtonComponent,
 } from '~/client/components/ui/Button/ButtonComponent';
 import { Icon } from '~/client/components/ui/Icon/Icon';
-import { REFERRER } from '~/client/hooks/useReferrer';
+import { PREVIOUS_PAGE } from '~/client/hooks/useDisplayBackButton';
 
 type BackButtonProps = Omit<React.ComponentPropsWithoutRef<typeof ButtonComponent>,'label'> & {
 	label?: string
 }
 
 export function BackButton({ className, label= 'Retour', ...rest }: BackButtonProps) {
-
 	const router = useRouter();
 
-	const referrer = useMemo( () => {
-		return sessionStorage.getItem(REFERRER);
-	}, []);
-
+	const [displayBackButton, setDisplayBackButton] = useState(false);
 	useEffect(() => {
-		return () => {
-			sessionStorage.removeItem(REFERRER);
-		};
+		const previousPage = sessionStorage.getItem(PREVIOUS_PAGE);
+		setDisplayBackButton(!!previousPage);
 	}, []);
 
-	if (referrer === null) return null;
-
 	return (
+		displayBackButton &&
 		<div className={className}>
 			<Container>
 				<ButtonComponent

src/client/components/features/Logement/Consulter/ConsulterAnnonce.test.tsx

@@ -9,22 +9,22 @@ import {
 
 import { ConsulterAnnonce } from '~/client/components/features/Logement/Consulter/ConsulterAnnonce';
 import { mockUseRouter } from '~/client/components/useRouter.mock';
-import { mockSessionStorage, mockSmallScreen } from '~/client/components/window.mock';
+import { mockSmallScreen } from '~/client/components/window.mock';
 import { LocaleProvider } from '~/client/context/locale.context';
 import { anAnnonceDeLogement } from '~/server/cms/domain/annonceDeLogement.fixture';
 import { AnnonceDeLogement } from '~/server/cms/domain/annonceDeLogement.type';
 
 describe('<ConsulterAnnonce />', () => {
 	beforeEach(() => {
+		jest.resetAllMocks();
 		mockSmallScreen();
-		mockSessionStorage({
-			setItem: jest.fn().mockReturnValue('/annonces'),
-		});
 		const routerReload = jest.fn();
 		mockUseRouter({ reload: routerReload });
 	});
 
 	it('affiche le le bouton retour vers la liste des annonces', () => {
+		jest.spyOn(Object.getPrototypeOf(sessionStorage), 'getItem').mockReturnValue('/');
+
 		const annonceDeLogement = anAnnonceDeLogement();
 		annonceDeLogement.titre = 'Super T3 dans le centre de Paris';
 

src/client/hooks/useDisplayBackButton.test.tsx

@@ -0,0 +1,54 @@
+/**
+ * @jest-environment jsdom
+ */
+
+import { render } from '@testing-library/react';
+
+import { mockUseRouter } from '~/client/components/useRouter.mock';
+import useDisplayBackButton from '~/client/hooks/useDisplayBackButton';
+
+function TestComponent() {
+	useDisplayBackButton();
+	return <></>;
+}
+
+describe('useDisplayBackButton', () => {
+	beforeEach(() => {
+		sessionStorage.clear();
+		jest.resetAllMocks();
+	});
+	describe('quand la page actuel est la première sur laquelle on navigue', () => {
+		it('stocke le pathname de la page dans sessionStorage', () => {
+			// Given
+			mockUseRouter({
+				pathname: '/',
+			});
+			const setItem = jest.spyOn(Object.getPrototypeOf(sessionStorage), 'setItem');
+			jest.spyOn(Object.getPrototypeOf(sessionStorage), 'getItem').mockReturnValue(null);
+
+			// When
+			render(<TestComponent />);
+
+			// Then
+			expect(setItem).toHaveBeenCalledWith('current-page', '/');
+		});
+	});
+
+	describe('quand la page actuel n’est pas la première sur laquelle on navigue', () => {
+		it('stocke le pathname de la page dans sessionStorage', () => {
+			// Given
+			mockUseRouter({
+				pathname: '/other-page',
+			});
+			const setItem = jest.spyOn(Object.getPrototypeOf(sessionStorage), 'setItem');
+			jest.spyOn(Object.getPrototypeOf(sessionStorage), 'getItem').mockReturnValue('/');
+
+			// When
+			render(<TestComponent />);
+
+			// Then
+			expect(setItem).toHaveBeenCalledWith('previous-page', '/');
+			expect(setItem).toHaveBeenLastCalledWith('current-page', '/other-page');
+		});
+	});
+});

src/client/hooks/useDisplayBackButton.ts

@@ -0,0 +1,19 @@
+import { useRouter } from 'next/router';
+import { useLayoutEffect } from 'react';
+
+const CURRENT_PAGE = 'current-page';
+export const PREVIOUS_PAGE = 'previous-page';
+
+function useDisplayBackButton(): void {
+	const router = useRouter();
+
+	useLayoutEffect(() => {
+		const currentPage = sessionStorage.getItem(CURRENT_PAGE);
+		if (currentPage && currentPage !== router.pathname) {
+			sessionStorage.setItem(PREVIOUS_PAGE, currentPage);
+		}
+		sessionStorage.setItem(CURRENT_PAGE, router.pathname);
+	}, [router.pathname]);
+}
+
+export default useDisplayBackButton;

src/client/hooks/useSessionStorage.ts

@@ -21,6 +21,6 @@ function useSessionStorage<T>(key: string): {get: () => T | null, set: (value: T
 		remove: () => setDefaultValue(null),
 		set: setDefaultValue,
 	};
-};
+}
 
 export default useSessionStorage;

src/pages/_app.page.tsx

@@ -9,7 +9,7 @@ import React, { ReactElement, ReactNode, useEffect, useMemo } from 'react';
 import { Layout } from '~/client/components/layouts/Layout';
 import { DependenciesProvider } from '~/client/context/dependenciesContainer.context';
 import dependenciesContainer from '~/client/dependencies.container';
-import useReferrer from '~/client/hooks/useReferrer';
+import useDisplayBackButton from '~/client/hooks/useDisplayBackButton';
 import useSessionId from '~/client/hooks/useSessionId';
 
 export type NextPageWithLayout<P = object> = NextPage<P, P> & {
@@ -24,7 +24,8 @@ export default function App({ Component, pageProps }: AppPropsWithLayout) {
 	const sessionId = useSessionId();
 	const dependenciesContainerInstance = useMemo(() => sessionId && dependenciesContainer(sessionId), [sessionId]);
 	const router = useRouter();
-	useReferrer();
+
+	useDisplayBackButton();
 
 	useEffect(() => {
 		const [/* full path */, targetId] = router.asPath.match(/^[^#]*#(.+)$/) ?? [];