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diff --git a/src/app/modules/alerting/alert.service.spec.ts b/src/app/modules/alerting/alert.service.spec.ts
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+++ b/src/app/modules/alerting/alert.service.spec.ts
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+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+// https://dev.to/coly010/unit-testing-angular-services-1anm
+import { Alert, AlertType } from './alert.model';
+import { TestBed } from '@angular/core/testing';
+import { AlertModule } from './alert.module';
+import { AlertService } from './alert.service';
+import { Subject } from 'rxjs';
+import SpyObj = jasmine.SpyObj;
+
+/**
+ * describe sets up the Test Suite for the TileService
+ */
+describe('AlertService', () => {
+  let service: AlertService;
+  let mockAlert: Alert;
+  let message: string;
+  let spyAlert: SpyObj<any>;
+  let subject: Subject<Alert>;
+
+  /**
+   * beforeEach tells the test runner to run this code before every test in the Test Suite
+   * It is using Angular's TestBed to create the testing environment and finally it is injecting the TilesService
+   * and placing a reference to it in the service variable defined earlier.
+   */
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [AlertService, AlertModule, Subject],
+    });
+    service = TestBed.inject(AlertService);
+    subject = TestBed.inject(Subject);
+    mockAlert = TestBed.inject(Alert);
+    spyAlert = spyOn(service, 'alert');
+    message = 'This is a test-alert';
+    mockAlert.message = message;
+  });
+
+  it('should be create', () => {
+    expect(service).toBeTruthy();
+  });
+  /**
+   * tests for the alert methods info, warning, error and success with a spyobject
+   */
+  it('should return success alert', () => {
+    mockAlert.type = AlertType.Success;
+    service.success(message);
+    expect(spyAlert).toHaveBeenCalledWith(mockAlert);
+  });
+
+  it('should return warning alert', () => {
+    mockAlert.type = AlertType.Warning;
+    service.warn(message);
+    expect(spyAlert).toHaveBeenCalledWith(mockAlert);
+  });
+
+  it('should return error alert', () => {
+    mockAlert.type = AlertType.Error;
+    service.error(message);
+    expect(spyAlert).toHaveBeenCalledWith(mockAlert);
+  });
+
+  it('should return info alert', () => {
+    mockAlert.type = AlertType.Info;
+    service.info(message);
+    expect(spyAlert).toHaveBeenCalledWith(mockAlert);
+  });
+
+  it('clear ', () => {
+    subject = service['subject'];
+    const spy = spyOn(subject, 'next');
+    const alert = new Alert();
+    alert.id = 'default-alert';
+    service.clear();
+    expect(spy).toHaveBeenCalledWith(alert);
+  });
+});