fix(angular): add test setup file

Author: Hristo Hristov

packages/igx-templates/igx-ts/projects/_base/files/angular.json

@@ -86,6 +86,7 @@
 				"test": {
 					"builder": "@angular-devkit/build-angular:karma",
 					"options": {
+            "main": "src/test.ts",
 						"polyfills": [
 							"zone.js",
 							"zone.js/testing"

packages/igx-templates/igx-ts/projects/_base/files/src/test.ts

@@ -0,0 +1,16 @@
+// This file is required by karma.conf.js and loads recursively all the .spec and framework files
+
+import 'zone.js/testing';
+import { getTestBed } from '@angular/core/testing';
+import {
+  BrowserTestingModule,
+  platformBrowserTesting
+} from '@angular/platform-browser-dynamic/testing';
+
+// First, initialize the Angular testing environment.
+getTestBed().initTestEnvironment(
+  BrowserTestingModule,
+  platformBrowserTesting(), {
+    teardown: { destroyAfterEach: false }
+  }
+);

packages/igx-templates/igx-ts/projects/_base/files/tsconfig.spec.json

@@ -7,6 +7,9 @@
       "jasmine"
     ]
   },
+  "files": [
+    "src/test.ts"
+  ],
   "include": [
     "src/**/*.spec.ts",
     "src/**/*.d.ts"