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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
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