Fix AppComponent test

src/app/app.component.spec.ts

@@ -3,8 +3,10 @@ import {async, ComponentFixture, TestBed} from '@angular/core/testing';
 import {FormsModule} from '@angular/forms';
 import {InputComponentManagerService} from './input-component-manager.service';
 import {Step} from './step';
-import {ConverterRegistryService} from './converter-registry.service';
 import {VersionComponent} from './version/version.component';
+import {ConverterSelectorComponent} from './converter-selector/converter-selector.component';
+import {TextInputFieldComponent} from './text-input-field/text-input-field.component';
+import {ErrorMessageComponent} from './error-message/error-message.component';
 import createSpyObj = jasmine.createSpyObj;
 
 describe('AppComponent', () => {
@@ -21,11 +23,16 @@ describe('AppComponent', () => {
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
-      declarations: [AppComponent, VersionComponent],
+      declarations: [
+        AppComponent,
+        ConverterSelectorComponent,
+        ErrorMessageComponent,
+        TextInputFieldComponent,
+        VersionComponent
+      ],
       imports: [FormsModule],
       providers: [
-        {provide: InputComponentManagerService, useValue: inputComponentManagerServiceStub},
-        {provide: ConverterRegistryService, useValue: converterRegistryServiceStub}
+        {provide: InputComponentManagerService, useValue: inputComponentManagerServiceStub}
       ]
     })
       .compileComponents();