Add cors

Change-Id: Ifa47ed402f124fb13fd9c02ec7500a4396b1d7bc
diff --git a/service_test.go b/service_test.go
index 936ec7e..eee7a79 100644
--- a/service_test.go
+++ b/service_test.go
@@ -39,11 +39,11 @@
 	router := setupRouter()
 
 	w := httptest.NewRecorder()
-	req, _ := http.NewRequest(http.MethodGet, "/index", nil)
+	req, _ := http.NewRequest(http.MethodGet, "/", nil)
 
 	router.ServeHTTP(w, req)
 
 	assert.Equal(t, http.StatusOK, w.Code)
-	assert.Contains(t, w.Body.String(), "data-server=\"https://korap.ids-mannheim.de/\"")
+	assert.Contains(t, w.Body.String(), "data-server=\"https://korap.ids-mannheim.de/instance/test\"")
 	assert.Contains(t, w.Body.String(), "<title>External Provider</title>")
 }