make sure that active connections are not cleared during test when an exception happens

activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb

@@ -443,11 +443,13 @@ def initialize(app)
       end
 
       def call(env)
+        testing = env.key?('rack.test')
+
         status, headers, body = @app.call(env)
 
-        [status, headers, Proxy.new(body, env.key?('rack.test'))]
+        [status, headers, Proxy.new(body, testing)]
       rescue
-        ActiveRecord::Base.clear_active_connections!
+        ActiveRecord::Base.clear_active_connections! unless testing
         raise
       end
     end

activerecord/test/cases/connection_management_test.rb

@@ -64,6 +64,14 @@ def test_connections_closed_if_exception
         assert !ActiveRecord::Base.connection_handler.active_connections?
       end
 
+      def test_connections_not_closed_if_exception_and_test
+        @env['rack.test'] = true
+        app               = Class.new(App) { def call(env); raise; end }.new
+        explosive         = ConnectionManagement.new(app)
+        assert_raises(RuntimeError) { explosive.call(@env) }
+        assert ActiveRecord::Base.connection_handler.active_connections?
+      end
+
       test "doesn't clear active connections when running in a test case" do
         @env['rack.test'] = true
         @management.call(@env)