raise a pull full error when the connection pool is full and no connection can be obtained

1 files changed, 8 insertions, 0 deletions

diff --git a/activerecord/test/cases/connection_pool_test.rb b/activerecord/test/cases/connection_pool_test.rb
index 3887a4fe96..26842d3998 100644
--- a/activerecord/test/cases/connection_pool_test.rb
+++ b/activerecord/test/cases/connection_pool_test.rb
@@ -25,6 +25,14 @@ module ActiveRecord
         @pool.connections.each(&:close)
       end
 
+      def test_full_pool_exception
+        assert_raises(PoolFullError) do
+          (@pool.size + 1).times do
+            @pool.checkout
+          end
+        end
+      end
+
       def test_reap_and_active
         @pool.checkout
         @pool.checkout