src/railties/test/application/zeitwerk_inflector_test.rb
# frozen_string_literal: true

require "abstract_unit"

class ZeitwerkInflectorTest < ActiveSupport::TestCase
  INFLECTOR = Rails::Autoloaders::Inflector

  def reset_overrides
    INFLECTOR.instance_variable_get(:@overrides).clear
  end

  def camelize(basename)
    INFLECTOR.camelize(basename, nil)
  end

  setup do
    reset_overrides
    @original_inflections = ActiveSupport::Inflector::Inflections.instance_variable_get(:@__instance__)[:en]
    ActiveSupport::Inflector::Inflections.instance_variable_set(:@__instance__, en: @original_inflections.dup)
  end

  teardown do
    reset_overrides
    ActiveSupport::Inflector::Inflections.instance_variable_set(:@__instance__, en: @original_inflections)
  end

  test "it camelizes regular basenames with String#camelize" do
    ActiveSupport::Inflector.inflections do |inflect|
      inflect.acronym("SSL")
    end

    assert_equal "User", camelize("user")
    assert_equal "UsersController", camelize("users_controller")
    assert_equal "Point3d", camelize("point_3d")
    assert_equal "SSLError", camelize("ssl_error")
  end

  test "overrides take precedence" do
    # Precondition, ensure we are testing something.
    assert_equal "MysqlAdapter", camelize("mysql_adapter")

    INFLECTOR.inflect("mysql_adapter" => "MySQLAdapter")
    assert_equal "MySQLAdapter", camelize("mysql_adapter")

    # The fallback is still in place.
    assert_equal "UsersController", camelize("users_controller")
  end
end
