I DREAM OF GEN’NING SCALACHECK IS BLACK MAGICK

Kelsey Gilmore-Innis (@kelseyinnis) + Stew O’Connor (@StewOConnor)

PROPERTY-BASED TESTING

BACKGROUND

GENERATES • RUNS • SHRINKS

GENERATORS

OUT OF THE BOTTLE• Boolean, Byte, Char, String, Int, Double, Long

• Throwable, Date

• Option, Either, Tuple2-Tuple9, Function1-Function5

• Array, List, ArrayList, Stream, Set, Map

• alphaChar, alphaNumChar, alphaLowerChar, alphaUpperChar

• alphaStr, numStr, identifier

EDGE CASE BIAS

FANCY GENS

.choose, .oneOf, .someOf

COMPOSING GENS

map • flatMap • filter/suchThat

.suchThat

http://etorreborre.blogspot.com/2011/02/scalacheck-generator-for-json.html

FREQUENCY

P1 BUG: BEYONCÉ NOT FOUND

PERFORMANCE TESTING

ROUND-TRIP PROPERTIES

ROUND-TRIP PROPERTIES

NEGATIVE TESTING

RUNNING SCALACHECK TESTS

INTEGRATION

PARAMS

SCALACHECK + SELENIUMhttps://github.com/jessitron/js-with-scalacheck

COMMANDS

TESTING SERVER NETWORKShttp://scalacheck.org/files/scaladays2014/index.html

SIMULATION TESTING

SHRINKING

MAKING IT LOOK EASY

BYE!