brew/Library/Homebrew/test/cmd/help_spec.rb

# typed: false
# frozen_string_literal: true

describe "brew", :integration_test do
  describe "help" do
    it "prints help for a documented Ruby command" do
      expect { brew "help", "cat" }
        .to output(/^Usage: brew cat/).to_stdout
        .and not_to_output.to_stderr
        .and be_a_success
    end
  end

  describe "cat" do
    it "prints help when no argument is given" do
      expect { brew "cat" }
        .to output(/^Usage: brew cat/).to_stderr
        .and not_to_output.to_stdout
        .and be_a_failure
    end
  end
end