add existence check test

Author: bugthesystem

tests/interceptors/seo-interceptor.spec.js

@@ -0,0 +1,35 @@
+describe("seoInterceptor", function () {
+
+    const seoInterceptorName = "seoInterceptor";
+
+    let seoInterceptor, httpProvider, httpBackend;
+    beforeEach(angular.mock.module('espackApp', ($httpProvider)=> {
+        httpProvider = $httpProvider;
+    }));
+
+    describe('#existence', () => {
+
+        beforeEach(()=> {
+            _inject();
+        });
+
+        it('should be added to $http interceptors', ()=> {
+
+            var interceptorNames = httpProvider.interceptors
+                .filter((item)=> item.prototype.constructor.name === seoInterceptorName)
+                .map((item)=>item.prototype.constructor.name);
+
+            expect(interceptorNames.length).toEqual(1);
+            expect(interceptorNames).toEqual([seoInterceptorName])
+
+        });
+
+    });
+
+    function _inject() {
+        inject(($httpBackend) => {
+            httpBackend = $httpBackend;
+        });
+    }
+
+});