empty_heredoc_spec.rb

# frozen_string_literal: true

RSpec.describe RuboCop::Cop::Style::EmptyHeredoc, :config do
  it 'registers an offense when using empty `<<~EOS` heredoc' do
    expect_offense(<<~RUBY)
      <<~EOS
      ^^^^^^ Use an empty string literal instead of heredoc.
      EOS
    RUBY

    expect_correction(<<~RUBY)
      ''
    RUBY
  end

  it 'registers an offense when using empty `<<-EOS` heredoc' do
    expect_offense(<<~RUBY)
      <<-EOS
      ^^^^^^ Use an empty string literal instead of heredoc.
      EOS
    RUBY

    expect_correction(<<~RUBY)
      ''
    RUBY
  end

  it 'registers an offense when using empty `<<EOS` heredoc' do
    expect_offense(<<~RUBY)
      <<EOS
      ^^^^^ Use an empty string literal instead of heredoc.
      EOS
    RUBY

    expect_correction(<<~RUBY)
      ''
    RUBY
  end

  it 'registers an offense when using empty heredoc single argument' do
    expect_offense(<<~RUBY)
      do_something(<<~EOS)
                   ^^^^^^ Use an empty string literal instead of heredoc.
      EOS
    RUBY

    expect_correction(<<~RUBY)
      do_something('')
    RUBY
  end

  it 'registers an offense when using empty heredoc argument with other argument' do
    expect_offense(<<~RUBY)
      do_something(<<~EOS, arg)
                   ^^^^^^ Use an empty string literal instead of heredoc.
      EOS
    RUBY

    expect_correction(<<~RUBY)
      do_something('', arg)
    RUBY
  end

  it 'does not register an offense when using not empty heredoc' do
    expect_no_offenses(<<~RUBY)
      <<~EOS
        Hello.
      EOS
    RUBY
  end
end