Code Example: Implementation of Builder pattern for test setups, used in http://blog.zuehlke.com/?p=1421

TestSubjectBuilder.cs

internal class ControllerBuilder
{
    private IDataSource _dataSource;
    private IEnumerable<string> _names = new[] {"Alice", "Bob", "Alfred"};

    public ControllerBuilder WithDataSource(IDataSource dataSource)
    {
        _dataSource = dataSource;
        return this;
    }

    public ControllerBuilder WithNames(params string[] names)
    {
        _names = names;
        return this;
    }

    public Controller Build()
    {
        if (_dataSource == null)
        {
            var stub = new Mock<IDataSource>();
            stub.Setup(x => x.GetNames()).Returns(_names);
            _dataSource = stub.Object;
        }

        return new Controller(_dataSource);
    }
}