Creates a mock binding scope allowing a user to replace multimethod functionality for the given Multimethod. Takes a MultiFn (defmulti) and a vector of [dispatch fn] bindings to replace. The body is executed with the updated multimethods and the original multimethod definitions are replaced upon completion. Returns the result of body.

Example:

(defmulti foo (fn [a b] a))

(defmethod foo :bar [a b] [a b])

(foo :bar 1)
;;=> [:bar 1]

(multimock foo
  [:bar (fn [a b] [a (inc b)])]
  (foo :bar 1))
;;=> [:bar 2]

Replaces the Multimethod with the given dispatch with the given function

Resets all methods associated with the given Multimethod to match what is in the provided map of dispatch->fn.