diff options
Diffstat (limited to 'test')
| -rw-r--r-- | test/test_nodes.rb | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/test/test_nodes.rb b/test/test_nodes.rb new file mode 100644 index 0000000000..bf0082396d --- /dev/null +++ b/test/test_nodes.rb @@ -0,0 +1,34 @@ +# frozen_string_literal: true +require 'helper' + +module Arel + module Nodes + class TestNodes < Minitest::Test + def test_every_arel_nodes_have_hash_eql_eqeq_from_same_class + # #descendants code from activesupport + node_descendants = [] + ObjectSpace.each_object(Arel::Nodes::Node.singleton_class) do |k| + next if k.respond_to?(:singleton_class?) && k.singleton_class? + node_descendants.unshift k unless k == self + end + node_descendants.delete(Arel::Nodes::Node) + + bad_node_descendants = node_descendants.reject do |subnode| + eqeq_owner = subnode.instance_method(:==).owner + eql_owner = subnode.instance_method(:eql?).owner + hash_owner = subnode.instance_method(:hash).owner + + eqeq_owner < Arel::Nodes::Node && + eqeq_owner == eql_owner && + eqeq_owner == hash_owner + end + + problem_msg = 'Some subclasses of Arel::Nodes::Node do not have a' \ + ' #== or #eql? or #hash defined from the same class as the others' + assert_empty bad_node_descendants, problem_msg + end + + + end + end +end |