Programming Clojure (The Pragmatic Programmers) by Alex Miller & Stuart Halloway & Aaron Bedra

Author:Alex Miller & Stuart Halloway & Aaron Bedra [Miller, Alex]
Language: eng
Format: epub
Tags: Pragmatic Bookshelf
Publisher: Pragmatic Bookshelf
Published: 2018-02-22T23:00:00+00:00

Generating Examples

The argument spec we used above was (s/cat :ns (s/? string?) :name string?). To simulate how check generates random arguments from that spec, we can use the s/exercise function, which produces pairs of examples and their conformed values:

(s/exercise (s/cat :ns (s/? string?) :name string?))

-> ([("" "") {:ns "", :name ""}]

[("F" "") {:ns "F", :name ""}]

[("s" "73") {:ns "s", :name "73"}]

[("u") {:name "u"}]

[("") {:name ""}]

[("" "3y") {:ns "", :name "3y"}]

[("t" "9pudu") {:ns "t", :name "9pudu"}]

[("Xhw25" "nPR7C9C") {:ns "Xhw25", :name "nPR7C9C"}]

[("FXs3E" "N") {:ns "FXs3E", :name "N"}]

[("UhUN5dZK1" "le8") {:ns "UhUN5dZK1", :name "le8"}])

This example works, but sometimes spec can’t automatically create a valid generator, or you need to create a custom generator for related arguments. In the following sections, we’ll see how to address these issues. First, let’s consider a case where an s/and spec doesn’t produce any values.

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