diff --git a/src/Squidex/app/shared/services/graphql.service.spec.ts b/src/Squidex/app/shared/services/graphql.service.spec.ts
new file mode 100644
index 000000000..7a5300a97
--- /dev/null
+++ b/src/Squidex/app/shared/services/graphql.service.spec.ts
@@ -0,0 +1,48 @@
+/*
+ * Squidex Headless CMS
+ *
+ * @license
+ * Copyright (c) Sebastian Stehle. All rights reserved
+ */
+
+import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
+import { inject, TestBed } from '@angular/core/testing';
+
+import { ApiUrlConfig, GraphQlService } from './../';
+
+describe('GraphQlService', () => {
+    beforeEach(() => {
+        TestBed.configureTestingModule({
+            imports: [
+                HttpClientTestingModule
+            ],
+            providers: [
+                GraphQlService,
+                { provide: ApiUrlConfig, useValue: new ApiUrlConfig('http://service/p/') }
+            ]
+        });
+    });
+
+    afterEach(inject([HttpTestingController], (httpMock: HttpTestingController) => {
+        httpMock.verify();
+    }));
+
+    it('should make get request to get history events',
+        inject([GraphQlService, HttpTestingController], (graphQlService: GraphQlService, httpMock: HttpTestingController) => {
+
+        let graphQlResult = null;
+
+        graphQlService.query('my-app', { }).subscribe(result => {
+            graphQlResult = result;
+        });
+
+        const req = httpMock.expectOne('http://service/p/api/content/my-app/graphql');
+
+        expect(req.request.method).toEqual('POST');
+        expect(req.request.headers.get('If-Match')).toBeNull();
+
+        req.flush({ result: true });
+
+        expect(graphQlResult).toEqual({ result: true });
+    }));
+});
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