diff --git a/testing.go b/testing.go
new file mode 100644
index 0000000..355111c
--- /dev/null
+++ b/testing.go
@@ -0,0 +1,15 @@
+package qg
+
+import "github.com/jackc/pgx/v5/pgxpool"
+
+// // TestInjectJobConn injects *pgxpool.Conn to Job
+func TestInjectJobConn(j *Job, conn *pgxpool.Conn) *Job {
+	j.conn = conn
+	return j
+}
+
+// TestInjectJobTx injects tx to Job
+func TestInjectJobTx(j *Job, tx Txer) *Job {
+	j.tx = tx
+	return j
+}