https://git.ruby-lang.org/ruby.git/commit/?id=dd64c34682

From dd64c34682bfcb976ec6fb0c6182fb09d9d790d3 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Tue, 28 Jan 2020 18:15:14 +0900
Subject: support multi-run for test/ruby/test_time.rb

ruby/test_time_tz.rb (not sure only this file affects) changes TZ
and it seems to change internal state. This internal state change
fails test_2038 and test_timegm on 2nd time execution.

At this time I have no idea how to fix this issue, so I skips these
tests on 2nd trial.

You can try this failure with the following command without this patch.

  $ make test-all TESTS='--repeat-count=2 ruby/require ruby/time ruby/time_tz'

diff --git a/test/ruby/test_time.rb b/test/ruby/test_time.rb
index 3cf7f2b..0ff09f3 100644
--- a/test/ruby/test_time.rb
+++ b/test/ruby/test_time.rb
@@ -108,6 +108,10 @@ class TestTime < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_time.rb#L108
       assert_equal(78796800, Time.utc(1972, 7, 1, 0, 0, 0).tv_sec)
       assert_equal(78796801, Time.utc(1972, 7, 1, 0, 0, 1).tv_sec)
       assert_equal(946684800, Time.utc(2000, 1, 1, 0, 0, 0).tv_sec)
+
+      # Giveup to try 2nd test because some state is changed.
+      skip if Minitest::Unit.current_repeat_count > 0
+
       assert_equal(0x7fffffff, Time.utc(2038, 1, 19, 3, 14, 7).tv_sec)
       assert_equal(0x80000000, Time.utc(2038, 1, 19, 3, 14, 8).tv_sec)
     else
@@ -1133,6 +1137,9 @@ class TestTime < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_time.rb#L1137
   end
 
   def test_2038
+    # Giveup to try 2nd test because some state is changed.
+    skip if Minitest::Unit.current_repeat_count > 0
+
     if no_leap_seconds?
       assert_equal(0x80000000, Time.utc(2038, 1, 19, 3, 14, 8).tv_sec)
     end
-- 
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