diff --git a/activerecord/test/cases/connection_pool_test.rb b/activerecord/test/cases/connection_pool_test.rb
index 9ac03629c3132c716c6a6d7879fe5e39cae70b02..bd87a2d5f0f2f279cd1430d1ea9d57a55b75f020 100644
--- a/activerecord/test/cases/connection_pool_test.rb
+++ b/activerecord/test/cases/connection_pool_test.rb
@@ -156,6 +156,43 @@ def test_reap_inactive
         @pool.connections.each { |conn| conn.close if conn.in_use? }
       end
 
+      def test_idle_timeout_configuration
+        @pool.disconnect!
+        spec = ActiveRecord::Base.connection_pool.spec
+        spec.config.merge!(idle_timeout: "0.02")
+        @pool = ConnectionPool.new(spec)
+        idle_conn = @pool.checkout
+        @pool.checkin(idle_conn)
+
+        def idle_conn.seconds_idle
+          @seconds_idle
+        end
+
+        idle_conn.instance_variable_set(:@seconds_idle, 0.01)
+        @pool.flush
+        assert_equal 1, @pool.connections.length
+
+        idle_conn.instance_variable_set(:@seconds_idle, 0.02)
+        @pool.flush
+        assert_equal 0, @pool.connections.length
+      end
+
+      def test_disable_flush
+        @pool.disconnect!
+        spec = ActiveRecord::Base.connection_pool.spec
+        spec.config.merge!(idle_timeout: -5)
+        @pool = ConnectionPool.new(spec)
+        idle_conn = @pool.checkout
+        @pool.checkin(idle_conn)
+
+        def idle_conn.seconds_idle
+          1
+        end
+
+        @pool.flush
+        assert_equal 1, @pool.connections.length
+      end
+
       def test_flush
         idle_conn = @pool.checkout
         recent_conn = @pool.checkout
diff --git a/activerecord/test/cases/reaper_test.rb b/activerecord/test/cases/reaper_test.rb
index b034fe3e3b6d5063361ae836bb282f27af43165b..b630f782bc5b4affe189d900e86628be9e323865 100644
--- a/activerecord/test/cases/reaper_test.rb
+++ b/activerecord/test/cases/reaper_test.rb
@@ -61,9 +61,9 @@ def test_pool_has_reaper
 
       def test_reaping_frequency_configuration
         spec = ActiveRecord::Base.connection_pool.spec.dup
-        spec.config[:reaping_frequency] = 100
+        spec.config[:reaping_frequency] = "10.01"
         pool = ConnectionPool.new spec
-        assert_equal 100, pool.reaper.frequency
+        assert_equal 10.01, pool.reaper.frequency
       end
 
       def test_connection_pool_starts_reaper