"There are many assertion libraries but none assert thoroughly collections. These usually can be enumerated in multiple ways, requiring multiple assertions. I've been working on multiple projects where I implement enumerables. Handwriting all assertions was too error-prone. I decided to create this library and added enough functionality that it is now the only assertions library I use. It was my first actual fluent interface. I did learn how to design it so that only the assertions possible in that context are made available."