diff --git a/extended_query_builder_test.go b/extended_query_builder_test.go
new file mode 100644
index 000000000..dd7082cd2
--- /dev/null
+++ b/extended_query_builder_test.go
@@ -0,0 +1,48 @@
+package pgx_test
+
+import (
+	"os"
+	"testing"
+
+	"github.com/jackc/pgx/v5"
+)
+
+// type SomeObject struct {
+// 	Item *Item
+// }
+
+type Item struct {
+	Name  string
+	Value string
+}
+
+func TestExtendedQueryBuilder(t *testing.T) {
+	t.Parallel()
+
+	var conn *pgx.Conn
+	t.Run("connect to database", func(t *testing.T) {
+		connString := os.Getenv("PGX_TEST_DATABASE")
+		config := mustParseConfig(t, connString)
+		config.DefaultQueryExecMode = pgx.QueryExecModeExec
+		conn = mustConnect(t, config)
+		conn.TypeMap().RegisterDefaultPgType(&Item{}, "jsonb")
+	})
+
+	t.Run("create table", func(t *testing.T) {
+		sql := `
+			CREATE TABLE IF NOT EXISTS some_objects (
+				item jsonb
+			)
+		`
+		mustExec(t, conn, sql)
+	})
+
+	t.Run("insert data", func(t *testing.T) {
+		item := &Item{
+			Name:  "test",
+			Value: "value",
+		}
+		sql := `INSERT INTO some_objects (item) VALUES ($1)`
+		mustExec(t, conn, sql, item)
+	})
+}