test: add a mock localization pipe to core testing

npm/ng-packs/packages/core/testing/src/lib/pipes/index.ts

@@ -0,0 +1 @@
+export * from './mock-localization.pipe';

npm/ng-packs/packages/core/testing/src/lib/pipes/mock-localization.pipe.ts

@@ -0,0 +1,12 @@
+import { Config } from '@abp/ng.core';
+import { Injectable, Pipe, PipeTransform } from '@angular/core';
+
+@Injectable()
+@Pipe({
+  name: 'abpLocalization',
+})
+export class MockLocalizationPipe implements PipeTransform {
+  transform(value: string | Config.LocalizationWithDefault = '', ..._: string[]) {
+    return typeof value === 'string' ? value : value.defaultValue;
+  }
+}