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34 lines
1.2 KiB
Ruby
34 lines
1.2 KiB
Ruby
# frozen_string_literal: true
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require_relative "helper"
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module Arel
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module Nodes
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class TestNodes < Arel::Test
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def test_every_arel_nodes_have_hash_eql_eqeq_from_same_class
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# #descendants code from activesupport
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node_descendants = []
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ObjectSpace.each_object(Arel::Nodes::Node.singleton_class) do |k|
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next if k.respond_to?(:singleton_class?) && k.singleton_class?
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node_descendants.unshift k unless k == self
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end
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node_descendants.delete(Arel::Nodes::Node)
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node_descendants.delete(Arel::Nodes::NodeExpression)
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bad_node_descendants = node_descendants.reject do |subnode|
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eqeq_owner = subnode.instance_method(:==).owner
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eql_owner = subnode.instance_method(:eql?).owner
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hash_owner = subnode.instance_method(:hash).owner
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eqeq_owner < Arel::Nodes::Node &&
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eqeq_owner == eql_owner &&
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eqeq_owner == hash_owner
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end
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problem_msg = "Some subclasses of Arel::Nodes::Node do not have a" \
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" #== or #eql? or #hash defined from the same class as the others"
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assert_empty bad_node_descendants, problem_msg
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end
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end
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end
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end
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