require 'cases/helper' if ActiveRecord::Base.connection.supports_explain? class ExplainSubscriberTest < ActiveRecord::TestCase SUBSCRIBER = ActiveRecord::ExplainSubscriber.new def test_collects_nothing_if_available_queries_for_explain_is_nil with_queries(nil) do SUBSCRIBER.call assert_nil Thread.current[:available_queries_for_explain] end end def test_collects_nothing_if_the_payload_has_an_exception with_queries([]) do |queries| SUBSCRIBER.call(:exception => Exception.new) assert queries.empty? end end def test_collects_nothing_for_ignored_payloads with_queries([]) do |queries| ActiveRecord::ExplainSubscriber::IGNORED_PAYLOADS.each do |ip| SUBSCRIBER.call(:name => ip) end assert queries.empty? end end def test_collects_pairs_of_queries_and_binds sql = 'select 1 from users' binds = [1, 2] with_queries([]) do |queries| SUBSCRIBER.call(:name => 'SQL', :sql => sql, :binds => binds) assert_equal 1, queries.size assert_equal sql, queries[0][0] assert_equal binds, queries[0][1] end end def test_collects_nothing_if_unexplained_sqls with_queries([]) do |queries| SUBSCRIBER.call(:name => 'SQL', :sql => 'SHOW max_identifier_length') assert queries.empty? end end def with_queries(queries) Thread.current[:available_queries_for_explain] = queries yield queries ensure Thread.current[:available_queries_for_explain] = nil end end end