public void TestInitialize()
        {
            Mock.SetupStatic(typeof(ODataControllerHelper));
            Mock.SetupStatic(typeof(CurrentUserDataProvider));
            Mock.SetupStatic(typeof(HttpContext));

            Mock.Arrange(() => HttpContext.Current.Request.Headers.Get(TENANT_ID_HEADER_KEY))
            .Returns(TENANT_ID)
            .OccursOnce();

            _calloutDefinitionsController = new CalloutDefinitionsController();
            _lifeCycleContext             = Mock.Create <LifeCycleContext>();
        }