RSpec.describe Dry::Validation::Schema, 'dynamic predicate args' do
  subject(:schema) do
    Dry::Validation.Schema do
      configure do
        def data
          %w(a b c)
        end
      end

      required(:letter).filled(included_in?: data)
    end
  end

  it 'evaluates predicate arguments' do
    expect(schema.(letter: 'a')).to be_success
    expect(schema.(letter: 'f')).to be_failure
  end
end