This is an example of a neat trick that I learned about test builders in C# whilst attending the LeedsSharp user group (http://www.leeds-sharp.co.uk/). Leeds Sharp meets on the last Thursday of every month.

Test builders are classes used to simplify the creation of complex objects in tests. They have a series of "with" methods corresponding to setting fields in the target object, where these are called in a chain to generate the target object. The final method call in this chain is a build() call that converts the builder object into the desired target object.

This example shows that by using implicit type conversion in C#, this final build() call is not necessary for a builder.