diff options
Diffstat (limited to 'activerecord/test/cases/explain_test.rb')
-rw-r--r-- | activerecord/test/cases/explain_test.rb | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/activerecord/test/cases/explain_test.rb b/activerecord/test/cases/explain_test.rb new file mode 100644 index 0000000000..cb7781f8e7 --- /dev/null +++ b/activerecord/test/cases/explain_test.rb @@ -0,0 +1,117 @@ +require 'cases/helper' +require 'models/car' +require 'active_support/core_ext/string/strip' + +if ActiveRecord::Base.connection.supports_explain? + class ExplainTest < ActiveRecord::TestCase + fixtures :cars + + def base + ActiveRecord::Base + end + + def connection + base.connection + end + + def test_logging_query_plan_with_logger + base.logger.expects(:warn).with do |message| + message.starts_with?('EXPLAIN for:') + end + + with_threshold(0) do + Car.where(:name => 'honda').all + end + end + + def test_logging_query_plan_without_logger + original = base.logger + base.logger = nil + + class << base.logger + def warn; raise "Should not be called" end + end + + with_threshold(0) do + car = Car.where(:name => 'honda').first + assert_equal 'honda', car.name + end + ensure + base.logger = original + end + + def test_collect_queries_for_explain + base.auto_explain_threshold_in_seconds = nil + queries = Thread.current[:available_queries_for_explain] = [] + + with_threshold(0) do + Car.where(:name => 'honda').all + end + + sql, binds = queries[0] + assert_match "SELECT", sql + assert_match "honda", sql + assert_equal [], binds + ensure + Thread.current[:available_queries_for_explain] = nil + end + + def test_collecting_queries_for_explain + result, queries = ActiveRecord::Base.collecting_queries_for_explain do + Car.where(:name => 'honda').all + end + + sql, binds = queries[0] + assert_match "SELECT", sql + assert_match "honda", sql + assert_equal [], binds + assert_equal [cars(:honda)], result + end + + def test_exec_explain_with_no_binds + sqls = %w(foo bar) + binds = [[], []] + queries = sqls.zip(binds) + + connection.stubs(:explain).returns('query plan foo', 'query plan bar') + expected = sqls.map {|sql| "EXPLAIN for: #{sql}\nquery plan #{sql}"}.join("\n") + assert_equal expected, base.exec_explain(queries) + end + + def test_exec_explain_with_binds + cols = [Object.new, Object.new] + cols[0].expects(:name).returns('wadus') + cols[1].expects(:name).returns('chaflan') + + sqls = %w(foo bar) + binds = [[[cols[0], 1]], [[cols[1], 2]]] + queries = sqls.zip(binds) + + connection.stubs(:explain).returns("query plan foo\n", "query plan bar\n") + expected = <<-SQL.strip_heredoc + EXPLAIN for: #{sqls[0]} [["wadus", 1]] + query plan foo + + EXPLAIN for: #{sqls[1]} [["chaflan", 2]] + query plan bar + SQL + assert_equal expected, base.exec_explain(queries) + end + + def test_silence_auto_explain + base.expects(:collecting_sqls_for_explain).never + base.logger.expects(:warn).never + base.silence_auto_explain do + with_threshold(0) { Car.all } + end + end + + def with_threshold(threshold) + current_threshold = base.auto_explain_threshold_in_seconds + base.auto_explain_threshold_in_seconds = threshold + yield + ensure + base.auto_explain_threshold_in_seconds = current_threshold + end + end +end |