I'm pretty sure the question was about random test case numbers :P JS version generates 2 numbers up to 200 digits, so I suspect it's similar for other languages.

For JS 0<=Math.random()<1

Added

Use this test:

// TODO: replace with your own tests (TDD). An example to get you started is included below.
// Ginkgo BDD Testing Framework <http://onsi.github.io/ginkgo></http:>
// Gomega Matcher Library <http://onsi.github.io/gomega></http:>

package kata_test
import (
  . "github.com/onsi/ginkgo"
  . "github.com/onsi/gomega"
  . "codewarrior/kata"
)
var _ = Describe("Test Example", func() {
   It("should test that the solution returns the correct value", func() {
    Expect(BoolToWord(true)).To(Equal("Yes"))
    Expect(BoolToWord(false)).To(Equal("No"))
   })
})