Clojure protocols are a great way to encapsulate operations with side
effects, but suffer from a lack of general test tooling. Shrubbery provides
a small set of basic building blocks for working with them:
* stub, which accepts a protocol and a hashmap of functions and returns an
implementation with those functions (functions without implementations
return nil);
* spy, which accepts a protocol and some implementation and returns a new
implementation that tracks the number of times each of its members were
called;
* mock, which wraps a stub in a spy, allowing callers to supply basic
function implementations and assert against those calls; and
* received?, which in conjunction with the Matcher protocol provides a way
to query spies and mocks
Shrubbery was written with clojure.test and Cursive in mind. It should work
nicely with goodies like jump-to-reference and rename-function.
Source here: https://github.com/bguthrie/shrubbery
One major caveat is that it's heavily reliant on macros; my attempts to
reify protocols programmatically didn't work out in the end. However,
Shrubbery's macros introduce no new syntax and carry no side effects.
Feedback welcome!
Cheers,
Brian
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