1 files changed, 28 insertions, 4 deletions
diff --git a/test/ruby/test_sleep.rb b/test/ruby/test_sleep.rb
index 675fdc9747..7ef962db4a 100644
--- a/test/ruby/test_sleep.rb
+++ b/test/ruby/test_sleep.rb
@@ -1,10 +1,34 @@
+# frozen_string_literal: false
 require 'test/unit'
+require 'etc'
+require 'timeout'
 
 class TestSleep < Test::Unit::TestCase
   def test_sleep_5sec
-    start = Time.now
-    sleep 5
-    slept = Time.now-start
-    assert_in_delta(5.0, slept, 0.1, "[ruby-core:18015]: longer than expected")
+    EnvUtil.without_gc do
+      start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
+      sleep 5
+      slept = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
+      bottom = 5.0
+      assert_operator(slept, :>=, bottom)
+      assert_operator(slept, :<=, 6.0, "[ruby-core:18015]: longer than expected")
+    end
+  end
+
+  def test_sleep_forever_not_woken_by_sigchld
+    begin
+      t = Thread.new do
+        sleep 0.5
+        `echo hello`
+      end
+
+      assert_raise Timeout::Error do
+        Timeout.timeout 2 do
+          sleep # Should block forever
+        end
+      end
+    ensure
+      t.join
+    end
   end
 end