rails--rails/activesupport/test/deprecation/method_wrappers_test.rb

require "abstract_unit"
require "active_support/deprecation"

class MethodWrappersTest < ActiveSupport::TestCase
  def setup
    @klass = Class.new do
      def new_method; "abc" end
      alias_method :old_method, :new_method
    end
  end

  def test_deprecate_methods_warning_default
    warning = /old_method is deprecated and will be removed from Rails \d.\d \(use new_method instead\)/
    ActiveSupport::Deprecation.deprecate_methods(@klass, old_method: :new_method)

    assert_deprecated(warning) { assert_equal "abc", @klass.new.old_method }
  end

  def test_deprecate_methods_warning_with_optional_deprecator
    warning = /old_method is deprecated and will be removed from MyGem next-release \(use new_method instead\)/
    deprecator = ActiveSupport::Deprecation.new("next-release", "MyGem")
    ActiveSupport::Deprecation.deprecate_methods(@klass, old_method: :new_method, deprecator: deprecator)

    assert_deprecated(warning, deprecator) { assert_equal "abc", @klass.new.old_method }
  end

  def test_deprecate_methods_warning_when_deprecated_with_custom_deprecator
    warning = /old_method is deprecated and will be removed from MyGem next-release \(use new_method instead\)/
    deprecator = ActiveSupport::Deprecation.new("next-release", "MyGem")
    deprecator.deprecate_methods(@klass, old_method: :new_method)

    assert_deprecated(warning, deprecator) { assert_equal "abc", @klass.new.old_method }
  end
end