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require 'abstract_unit'
require 'active_support/core_ext/class/attribute'
class ClassAttributeTest < ActiveSupport::TestCase
def setup
@klass = Class.new { class_attribute :setting }
@sub = Class.new(@klass)
end
test 'defaults to nil' do
assert_nil @klass.setting
assert_nil @sub.setting
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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