The Crystal Programming Language Koans
Inspired from RubyKoans, CppKoans, GoKoans; an educational unit test suite for the Crystal Programming Language and standard library.
git clone "https://github.com/ilmanzo/crystal-koans"
crystal run koans.cr
to make a small step at a time
or run crystal spec
to run all the tests at onceshards install
crystal run watch.cr
. Keep it open and visible