fix(tests): declarated Error404 component inside unit tests

Author: Ismaestro

src/app/app.component.spec.ts

@@ -9,6 +9,7 @@ import {CUSTOM_ELEMENTS_SCHEMA} from '@angular/core';
 import {APP_CONFIG, AppConfig} from './config/app.config';
 import {HeroService} from './heroes/shared/hero.service';
 import {UtilsService} from './shared/services/utils.service';
+import {Error404Component} from './core/error404/error-404.component';
 
 describe('AppComponent', () => {
   let fixture;
@@ -23,7 +24,8 @@ describe('AppComponent', () => {
       ],
       declarations: [
         AppComponent,
-        HeroTopComponent
+        HeroTopComponent,
+        Error404Component
       ],
       providers: [
         {provide: APP_CONFIG, useValue: AppConfig},

src/app/core/core.module.ts

@@ -23,8 +23,7 @@ import {Error404Component} from './error404/error-404.component';
   ],
   exports: [
     NavComponent,
-    FooterComponent,
-    Error404Component
+    FooterComponent
   ],
   declarations: [
     NavComponent,

src/app/core/search-bar/search-bar.component.spec.ts

@@ -8,6 +8,7 @@ import {AppRoutingModule} from '../../app-routing.module';
 import {HeroTopComponent} from '../../heroes/hero-top/hero-top.component';
 import {APP_BASE_HREF} from '@angular/common';
 import {TestsModule} from '../../shared/modules/tests.module';
+import {Error404Component} from '../error404/error-404.component';
 
 describe('SearchBarComponent', () => {
   let fixture;
@@ -23,7 +24,8 @@ describe('SearchBarComponent', () => {
       ],
       declarations: [
         SearchBarComponent,
-        HeroTopComponent
+        HeroTopComponent,
+        Error404Component
       ],
       providers: [
         {provide: APP_CONFIG, useValue: AppConfig},

src/app/shared/modules/tests.module.ts

@@ -7,9 +7,9 @@ import {HttpClientModule} from '@angular/common/http';
 import {RouterModule} from '@angular/router';
 import {FormsModule, ReactiveFormsModule} from '@angular/forms';
 import {RouterTestingModule} from '@angular/router/testing';
+import {CoreModule} from '../../core/core.module';
 
 @NgModule({
-  declarations: [],
   exports: [
     BrowserModule,
     BrowserAnimationsModule,