Generative data from Specifications

Mock and test data values can be generated from the specifications defined.

Require the clojure.spec.gen.alpha namespace to access the data generators. The clojure.spec.test.alpha namespace is required to support getting a generator for a given specification.

(ns practicalli.card-game.clj
  (:require [clojure.spec.alpha :as spec]
            [clojure.spec.gen.alpha :as spec-gen]
            [clojure.spec.test.alpha :as spec-test]))

(spec/def ::suits #{:clubs :diamonds :hearts :spades})
(spec/def ::rank #{:ace 2 3 4 5 6 7 8 9 10 :jack :queen :king})

To generated data based on a specification, first get a generator for a given spec,

(spec/gen ::suits)

generate will return a value using the specific generator for the specification.

(spec-gen/generate (spec/gen ::suits))

sample will generate a number of values from the given specification

(spec-gen/sample (spec/gen ::rank))