1 files changed, 13 insertions, 10 deletions
diff --git a/activerecord/test/cases/connection_pool_test.rb b/activerecord/test/cases/connection_pool_test.rb
index c4108ad7f6..6300011f4a 100644
--- a/activerecord/test/cases/connection_pool_test.rb
+++ b/activerecord/test/cases/connection_pool_test.rb
@@ -124,7 +124,6 @@ module ActiveRecord
         @pool.checkout
         @pool.checkout
         @pool.checkout
-        @pool.dead_connection_timeout = 0
 
         connections = @pool.connections.dup
 
@@ -134,21 +133,25 @@ module ActiveRecord
       end
 
       def test_reap_inactive
+        ready = false
         @pool.checkout
-        @pool.checkout
-        @pool.checkout
-        @pool.dead_connection_timeout = 0
-
-        connections = @pool.connections.dup
-        connections.each do |conn|
-          conn.extend(Module.new { def active_threadsafe?; false; end; })
+        child = Thread.new do
+          @pool.checkout
+          @pool.checkout
+          ready = true
+          Thread.stop
         end
+        Thread.pass until ready
+
+        assert_equal 3, active_connections(@pool).size
 
+        child.terminate
+        child.join
         @pool.reap
 
-        assert_equal 0, @pool.connections.length
+        assert_equal 1, active_connections(@pool).size
       ensure
-        connections.each(&:close)
+        @pool.connections.each(&:close)
       end
 
       def test_remove_connection