BasicsTest#test_preserving_time_objects_with_time_with_zone_conversion_to_default_timezone_local fails

[yahonda]

Reproduced CI failure at Rails master branch. https://travis-ci.org/rails/rails/jobs/490356258#L1043-L1052

Steps to reproduce

$ cd activerecord
$ ARCONN=mysql2 bin/test test/cases/serialized_attribute_test.rb test/cases/attribute_methods_test.rb test/cases/base_test.rb -n "/^(?:SerializedAttributeTest#(?:test_serialize_does_not_eagerly_load_columns)|AttributeMethodsTest#(?:test_YAML_dumping_a_record_with_time_zone-aware_attribute)|BasicsTest#(?:test_preserving_time_objects_with_time_with_zone_conversion_to_default_timezone_local))$/" --seed 17411

Expected behavior

It should pass.

Actual behavior

$ ARCONN=mysql2 bin/test test/cases/serialized_attribute_test.rb test/cases/attribute_methods_test.rb test/cases/base_test.rb -n "/^(?:SerializedAttributeTest#(?:test_serialize_does_not_eagerly_load_columns)|AttributeMethodsTest#(?:test_YAML_dumping_a_record_with_time_zone-aware_attribute)|BasicsTest#(?:test_preserving_time_objects_with_time_with_zone_conversion_to_default_timezone_local))$/" --seed 17411
Using mysql2
Run options: -n "/^(?:SerializedAttributeTest#(?:test_serialize_does_not_eagerly_load_columns)|AttributeMethodsTest#(?:test_YAML_dumping_a_record_with_time_zone-aware_attribute)|BasicsTest#(?:test_preserving_time_objects_with_time_with_zone_conversion_to_default_timezone_local))$/" --seed 17411

# Running:

..F

Failure:
BasicsTest#test_preserving_time_objects_with_time_with_zone_conversion_to_default_timezone_local [/home/yahonda/git/rails/activerecord/test/cases/base_test.rb:256]:
--- expected
+++ actual
@@ -1 +1 @@
-[0, 0, 1, 1, 1, 2000, 6, 1, false, "EST"]
+[0, 0, 0, 1, 1, 2000, 6, 1, false, "CST"]



bin/test test/cases/base_test.rb:247



Finished in 0.435559s, 6.8877 runs/s, 11.4795 assertions/s.
3 runs, 5 assertions, 1 failures, 0 errors, 0 skips
$

System configuration

Rails version:master branch

Ruby version:
ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-linux]

• MySQL version

$ mysql --version
mysql  Ver 8.0.15 for Linux on x86_64 (MySQL Community Server - GPL)