diff --git a/npm/ng-packs/packages/core/src/lib/tests/dom-insertion.service.spec.ts b/npm/ng-packs/packages/core/src/lib/tests/dom-insertion.service.spec.ts
index 556583643e..aee2b3d9dc 100644
--- a/npm/ng-packs/packages/core/src/lib/tests/dom-insertion.service.spec.ts
+++ b/npm/ng-packs/packages/core/src/lib/tests/dom-insertion.service.spec.ts
@@ -6,6 +6,7 @@ describe('DomInsertionService', () => {
   let styleElements: NodeListOf<HTMLStyleElement>;
   let spectator: SpectatorService<DomInsertionService>;
   const createService = createServiceFactory(DomInsertionService);
+  const content = '.test {}';
 
   beforeEach(() => (spectator = createService()));
 
@@ -13,39 +14,37 @@ describe('DomInsertionService', () => {
 
   describe('#insertContent', () => {
     it('should be able to insert given content', () => {
-      spectator.service.insertContent(CONTENT_STRATEGY.AppendStyleToHead('.test {}'));
+      spectator.service.insertContent(CONTENT_STRATEGY.AppendStyleToHead(content));
       styleElements = document.head.querySelectorAll('style');
       expect(styleElements.length).toBe(1);
-      expect(styleElements[0].textContent).toBe('.test {}');
+      expect(styleElements[0].textContent).toBe(content);
     });
 
     it('should set a hash for the inserted content', () => {
-      spectator.service.insertContent(CONTENT_STRATEGY.AppendStyleToHead('.test {}'));
-      expect(spectator.service.inserted.has(1437348290)).toBe(true);
+      spectator.service.insertContent(CONTENT_STRATEGY.AppendStyleToHead(content));
+      expect(spectator.service.has(content)).toBe(true);
     });
 
     it('should insert only once', () => {
-      expect(spectator.service.inserted.has(1437348290)).toBe(false);
+      expect(spectator.service.has(content)).toBe(false);
 
-      spectator.service.insertContent(CONTENT_STRATEGY.AppendStyleToHead('.test {}'));
+      spectator.service.insertContent(CONTENT_STRATEGY.AppendStyleToHead(content));
       styleElements = document.head.querySelectorAll('style');
 
       expect(styleElements.length).toBe(1);
-      expect(styleElements[0].textContent).toBe('.test {}');
-      expect(spectator.service.inserted.has(1437348290)).toBe(true);
+      expect(styleElements[0].textContent).toBe(content);
+      expect(spectator.service.has(content)).toBe(true);
 
-      spectator.service.insertContent(CONTENT_STRATEGY.AppendStyleToHead('.test {}'));
+      spectator.service.insertContent(CONTENT_STRATEGY.AppendStyleToHead(content));
       styleElements = document.head.querySelectorAll('style');
 
       expect(styleElements.length).toBe(1);
-      expect(styleElements[0].textContent).toBe('.test {}');
-      expect(spectator.service.inserted.has(1437348290)).toBe(true);
+      expect(styleElements[0].textContent).toBe(content);
+      expect(spectator.service.has(content)).toBe(true);
     });
 
     it('should return inserted element', () => {
-      const element = spectator.service.insertContent(
-        CONTENT_STRATEGY.AppendStyleToHead('.test {}'),
-      );
+      const element = spectator.service.insertContent(CONTENT_STRATEGY.AppendStyleToHead(content));
       expect(element.tagName).toBe('STYLE');
     });
   });
@@ -53,13 +52,11 @@ describe('DomInsertionService', () => {
   describe('#removeContent', () => {
     it('should remove inserted element and the hash for the content', () => {
       expect(document.head.querySelector('style')).toBeNull();
-      const element = spectator.service.insertContent(
-        CONTENT_STRATEGY.AppendStyleToHead('.test {}'),
-      );
-      expect(spectator.service.inserted.has(1437348290)).toBe(true);
+      const element = spectator.service.insertContent(CONTENT_STRATEGY.AppendStyleToHead(content));
+      expect(spectator.service.has(content)).toBe(true);
 
       spectator.service.removeContent(element);
-      expect(spectator.service.inserted.has(1437348290)).toBe(false);
+      expect(spectator.service.has(content)).toBe(false);
       expect(document.head.querySelector('style')).toBeNull();
     });
   });
diff --git a/npm/ng-packs/packages/theme-shared/src/lib/tests/append-content.token.spec.ts b/npm/ng-packs/packages/theme-shared/src/lib/tests/append-content.token.spec.ts
index 5bfbd169e8..bcf48a0125 100644
--- a/npm/ng-packs/packages/theme-shared/src/lib/tests/append-content.token.spec.ts
+++ b/npm/ng-packs/packages/theme-shared/src/lib/tests/append-content.token.spec.ts
@@ -3,6 +3,7 @@ import { createComponentFactory, Spectator } from '@ngneat/spectator';
 import { THEME_SHARED_APPEND_CONTENT } from '../tokens/append-content.token';
 import { DomInsertionService } from '@abp/ng.core';
 import { chartJsLoaded$ } from '../utils';
+import styles from '../constants/styles';
 
 @Component({ selector: 'abp-dummy', template: '' })
 class DummyComponent {}
@@ -15,7 +16,7 @@ describe('AppendContentToken', () => {
 
   it('should insert a style element to the DOM', () => {
     spectator.get(THEME_SHARED_APPEND_CONTENT);
-    expect(spectator.get(DomInsertionService).inserted.size).toBe(1);
+    expect(spectator.get(DomInsertionService).has(styles)).toBe(true);
   });
 
   it('should be loaded the chart.js', done => {