Siesta -

There are two major libraries for building REST clients and services: Contributing code to SIESTA

: Features often involve adding new functional groups or solvers (like ELSI) by modifying source files. Siesta

: Extend Siesta.Test.Browser or Siesta.Test.NodeJS to create reusable assertion methods. There are two major libraries for building REST

For the testing framework, "writing a feature" usually refers to creating custom test assertions or behavioral tests. Siesta