public void Consttructor_ShouldConstructProperly()
{
const string name = "milad";
const double price = 1000;
var course = _course.WithPrice(price)
.WithName(name)
.Build();
course.Id.Should().Be(0);
course.Name.Should().Be("milad");
course.Price.Should().Be(1000);
course.Sections.Should().BeEmpty();
}
