public async Task GetAllCoursesAsync_ShouldReturnAllCourses()
{
var testCourses = _inMemoryRep.GetAll() as List <Course>;
var controller = new CourseController(_inMemoryRep);
var result = await controller.GetAllCoursesAsync() as List <Course>;
Assert.AreEqual(testCourses.Count, result.Count);
}
