[TestMethod]
    public void TestMethod1()
    {

        //arrange
        var request = new HttpRequestMessage(HttpMethod.Get, "http://localhost:34403/odata/Courses");
        var controller = new CoursesController
        {
            Request = request
        };

        ODataModelBuilder modelBuilder = new ODataConventionModelBuilder();
        modelBuilder.EntitySet<Courses>("Courses");
        var opts = new ODataQueryOptions<Courses>(new ODataQueryContext(modelBuilder.GetEdmModel(), typeof(Courses)), request);

        //act
        var result = controller.GetCourses1();

        //assert
        Assert.AreEqual(1, result);
    }

[EnableQuery]
    [ODataRoute("Courses")]
    public IQueryable<Courses> GetCourses1()
    {
        var courses = db.Courses.Where(list => list.Is_Deleted != true);
        var courseImage = courses.ToList();

        foreach (var course in courses)
        {
            if (course.DataURI != null)
                course.ImageURLPath = course.DataURI.Remove(0, 19);
            string imageWebPath = "http://" + course.ImageURLPath;
            imageWebPath = imageWebPath.Replace(@"", @"/");
            //Assign new web path to database record
            course.ImageURLPath = imageWebPath;
            course.DataURI = string.Empty;
        }
        return courses;
    }