feat(cart): implement CanActivateChild in in stock items guard

libs/cart/routing/src/guards/in-stock-items/in-stock-items.guard.spec.ts

@@ -109,4 +109,49 @@ describe('@daffodil/cart/routing | DaffCartInStockItemsGuard', () => {
       });
     });
   });
+
+  describe('canActivateChild', () => {
+    describe('when there are only in stock items in the cart', () => {
+      beforeEach(() => {
+        cartItems = cartItemFactory.createMany(1, {
+          in_stock: true,
+        });
+        store.dispatch(new DaffCartLoadSuccess({
+          ...cart,
+          items: cartItems,
+        }));
+      });
+
+      it('should allow activation', () => {
+        const expected = cold('(a|)', { a: true });
+
+        expect(service.canActivateChild()).toBeObservable(expected);
+      });
+    });
+
+
+    describe('when there are out of stock items in the cart', () => {
+      beforeEach(() => {
+        cartItems = cartItemFactory.createMany(1, {
+          in_stock: false,
+        });
+        spyOn(router, 'navigateByUrl');
+        store.dispatch(new DaffCartLoadSuccess({
+          ...cart,
+          items: cartItems,
+        }));
+      });
+
+      it('should not allow activation', () => {
+        const expected = cold('(a|)', { a: false });
+
+        expect(service.canActivateChild()).toBeObservable(expected);
+      });
+
+      it('should redirect to the given DaffCartInStockItemsGuardRedirectUrl', () => {
+        service.canActivate().subscribe();
+        expect(router.navigateByUrl).toHaveBeenCalledWith(stubUrl);
+      });
+    });
+  });
 });

libs/cart/routing/src/guards/in-stock-items/in-stock-items.guard.ts

@@ -3,8 +3,12 @@ import {
   Inject,
 } from '@angular/core';
 import {
+  ActivatedRouteSnapshot,
   CanActivate,
+  CanActivateChild,
   Router,
+  RouterStateSnapshot,
+  UrlTree,
 } from '@angular/router';
 import { Observable } from 'rxjs';
 import {
@@ -27,13 +31,17 @@ import { DaffCartInStockItemsGuardRedirectUrl } from './in-stock-items-guard-red
 @Injectable({
   providedIn: 'root',
 })
-export class DaffCartInStockItemsGuard implements CanActivate {
+export class DaffCartInStockItemsGuard implements CanActivate, CanActivateChild {
   constructor(
     private facade: DaffCartFacade,
     private router: Router,
     @Inject(DaffCartInStockItemsGuardRedirectUrl) private redirectUrl: string,
   ) {}
 
+  canActivateChild(): Observable<boolean> {
+    return this.canActivate();
+  }
+
   canActivate(): Observable<boolean> {
     return this.facade.hasOutOfStockItems$.pipe(
       map(hasOutOfStockItems => !hasOutOfStockItems),