diff --git a/internal/testutils/test_utils.go b/internal/testutils/test_utils.go
index cac4a62..37c1665 100644
--- a/internal/testutils/test_utils.go
+++ b/internal/testutils/test_utils.go
@@ -67,7 +67,8 @@ func AssertJSON(t *testing.T, data interface{}, expectedJSON string) {
 	jsonData, err := json.MarshalIndent(data, "", "\t")
 	require.NoError(t, err)
 
-	require.Equal(t, "\n"+string(jsonData)+"\n", expectedJSON)
+	dataJson := "\n" + string(jsonData) + "\n"
+	require.Equal(t, dataJson, expectedJSON)
 }
 
 // SaveJSONFile saves v as json at testRelativePath
diff --git a/tests/mysql/select_test.go b/tests/mysql/select_test.go
index 8bd028a..024d941 100644
--- a/tests/mysql/select_test.go
+++ b/tests/mysql/select_test.go
@@ -206,7 +206,7 @@ GROUP BY payment.customer_id;
 	"RentalID": null,
 	"Amount": 0,
 	"PaymentDate": "0001-01-01T00:00:00Z",
-	"LastUpdate": null,
+	"LastUpdate": "0001-01-01T00:00:00Z",
 	"Count": 8,
 	"Sum": 38.92,
 	"Avg": 4.865,