shard-ameba/spec/ameba/rule/lint/rand_zero_spec.cr

require "../../../spec_helper"

module Ameba::Rule::Lint
  describe RandZero do
    subject = RandZero.new

    it "passes if it is not rand(1) or rand(0)" do
      expect_no_issues subject, <<-CRYSTAL
        rand(1.0)
        rand(0.11)
        rand(2)
        CRYSTAL
    end

    it "fails if it is rand(0)" do
      expect_issue subject, <<-CRYSTAL
        rand(0)
        # ^^^^^ error: rand(0) always returns 0
        CRYSTAL
    end

    it "fails if it is rand(1)" do
      expect_issue subject, <<-CRYSTAL
        rand(1)
        # ^^^^^ error: rand(1) always returns 0
        CRYSTAL
    end
  end
end