require "abstract_unit" require "active_support/core_ext/class" require "set" class ClassTest < ActiveSupport::TestCase class Parent; end class Foo < Parent; end class Bar < Foo; end class Baz < Bar; end class A < Parent; end class B < A; end class C < B; end def test_descendants assert_equal [Foo, Bar, Baz, A, B, C].to_set, Parent.descendants.to_set assert_equal [Bar, Baz].to_set, Foo.descendants.to_set assert_equal [Baz], Bar.descendants assert_equal [], Baz.descendants end def test_subclasses assert_equal [Foo, A].to_set, Parent.subclasses.to_set assert_equal [Bar], Foo.subclasses assert_equal [Baz], Bar.subclasses assert_equal [], Baz.subclasses end def test_descendants_excludes_singleton_classes klass = Parent.new.singleton_class refute Parent.descendants.include?(klass), "descendants should not include singleton classes" end def test_subclasses_excludes_singleton_classes klass = Parent.new.singleton_class refute Parent.subclasses.include?(klass), "subclasses should not include singleton classes" end end