Testing

Testing follows a similar pattern to that in Javascript. A test in Crystal takes the following form:

describe ClassName do
    it "description of what it should do" do
        .... {expected behaviour}
    end
end

Naming test files

Filenames for test files should typically follow the format {class}_spec.cr. You can run all of your tests from the root folder of the project by running

crystal spec

but files that don't contain _spec in the name won't be included.

should

someValue.should expectation

should allows us to make assertions in a test. The expectation part of this is used to check a particular property of someValue. Crystal has several expectation methods, for example eq:

myNumber.should eq(5)

this assertion will be true when myNumber == 5