public void AddPackageToLine_AddCustomPackage_ReturnAddedPackage()
{
//arrange
Line line = _data.GetLine();
_mock.Setup(s => s.Line.Get(It.IsAny <int>()))
.Returns(line);
_manager = new PackageManager(_mock.Object);
//act
var package = _manager.AddPackageToLine(1, _data.GetCustomPackage());
//assert
Assert.IsNotNull(package);
}