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# frozen_string_literal: true
require "abstract_unit"
require "active_support/core_ext/class/attribute"
class ClassAttributeTest < ActiveSupport::TestCase
def setup
@klass = Class.new do
class_attribute :setting
class_attribute :timeout, default: 5
end
@sub = Class.new(@klass)
end
test "defaults to nil" do
assert_nil @klass.setting
assert_nil @sub.setting
end
test "custom default" do
assert_equal 5, @klass.timeout
end
test "inheritable" do
@klass.setting = 1
assert_equal 1, @sub.setting
end
test "overridable" do
@sub.setting = 1
assert_nil @klass.setting
@klass.setting = 2
assert_equal 1, @sub.setting
assert_equal 1, Class.new(@sub).setting
end
test "predicate method" do
assert_equal false, @klass.setting?
@klass.setting = 1
assert_equal true, @klass.setting?
end
test "instance reader delegates to class" do
assert_nil @klass.new.setting
@klass.setting = 1
assert_equal 1, @klass.new.setting
end
test "instance override" do
object = @klass.new
object.setting = 1
assert_nil @klass.setting
@klass.setting = 2
assert_equal 1, object.setting
end
test "instance predicate" do
object = @klass.new
assert_equal false, object.setting?
object.setting = 1
assert_equal true, object.setting?
end
test "disabling instance writer" do
object = Class.new { class_attribute :setting, instance_writer: false }.new
assert_raise(NoMethodError) { object.setting = "boom" }
end
test "disabling instance reader" do
object = Class.new { class_attribute :setting, instance_reader: false }.new
assert_raise(NoMethodError) { object.setting }
assert_raise(NoMethodError) { object.setting? }
end
test "disabling both instance writer and reader" do
object = Class.new { class_attribute :setting, instance_accessor: false }.new
assert_raise(NoMethodError) { object.setting }
assert_raise(NoMethodError) { object.setting? }
assert_raise(NoMethodError) { object.setting = "boom" }
end
test "disabling instance predicate" do
object = Class.new { class_attribute :setting, instance_predicate: false }.new
assert_raise(NoMethodError) { object.setting? }
end
test "works well with singleton classes" do
object = @klass.new
object.singleton_class.setting = "foo"
assert_equal "foo", object.setting
end
test "setter returns set value" do
val = @klass.send(:setting=, 1)
assert_equal 1, val
end
end
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