Resolve "Bug unselect all outputs"

Closes #63 (closed)

src/app/search/components/output/output-by-category.component.spec.ts

 import { async, ComponentFixture, TestBed } from '@angular/core/testing';
 import { Component, ViewChild } from '@angular/core';
 
+import { ToastrModule } from 'ngx-toastr';
+import { ToastrService } from 'ngx-toastr';
 import { OutputByCategoryComponent } from './output-by-category.component';
 import { Attribute } from '../../../metamodel/model';
 import { ATTRIBUTE_LIST } from '../../../../settings/test-data';
@@ -36,7 +38,9 @@ describe('[Search][Output] Component: OutputByCategoryComponent', () => {
             declarations: [
                 OutputByCategoryComponent,
                 TestHostComponent
-            ]
+            ],
+            imports: [ToastrModule.forRoot()],
+            providers: [ToastrService]
         });
         testHostFixture = TestBed.createComponent(TestHostComponent);
         testHostComponent = testHostFixture.componentInstance;