gorm v2.0 unit testing with sqlmock does not work with Postgres uint

go.mod

@@ -3,6 +3,7 @@ module gorm.io/playground
 go 1.20
 
 require (
+	github.com/DATA-DOG/go-sqlmock v1.5.2
 	gorm.io/driver/mysql v1.5.2
 	gorm.io/driver/postgres v1.5.2
 	gorm.io/driver/sqlite v1.5.3
@@ -31,5 +32,3 @@ require (
 	gorm.io/hints v1.1.0 // indirect
 	gorm.io/plugin/dbresolver v1.5.0 // indirect
 )
-
-replace gorm.io/gorm => ./gorm

mock_test.go

@@ -0,0 +1,232 @@
+package main
+
+import (
+	"database/sql"
+	"database/sql/driver"
+	"github.com/DATA-DOG/go-sqlmock"
+	"os"
+	"regexp"
+	"testing"
+	"time"
+
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+)
+
+type AnyTime struct{}
+
+// Match satisfies sqlmock.Argument interface
+func (a AnyTime) Match(v driver.Value) bool {
+	_, ok := v.(time.Time)
+	return ok
+}
+func TestGORMV2_Failing(t *testing.T) {
+
+	type Student struct {
+		gorm.Model
+		Name string `gorm:"type:varchar(50);not null"`
+	}
+	type v2Suite struct {
+		db      *gorm.DB
+		mock    sqlmock.Sqlmock
+		student Student
+	}
+
+	s := &v2Suite{}
+	var (
+		db  *sql.DB
+		err error
+	)
+
+	db, s.mock, err = sqlmock.New()
+	if err != nil {
+		t.Errorf("Failed to open mock sql db, got error: %v", err)
+	}
+
+	if db == nil {
+		t.Error("mock db is null")
+	}
+
+	if s.mock == nil {
+		t.Error("sqlmock is null")
+	}
+
+	s.db, err = gorm.Open(postgres.New(
+		postgres.Config{
+			Conn:       db,
+			DriverName: "postgres",
+		},
+	), &gorm.Config{})
+	if err != nil {
+		panic(err) // Error here
+	}
+
+	defer db.Close()
+
+	s.student = Student{
+		Name: "Test 1",
+	}
+
+	defer db.Close()
+
+	s.mock.ExpectBegin()
+
+	s.mock.ExpectExec(
+		regexp.QuoteMeta(`INSERT INTO "students" ("created_at","updated_at","deleted_at","name") VALUES ($1,$2,$3,$4) RETURNING "id"`)).
+		WithArgs(AnyTime{}, AnyTime{}, nil, s.student.Name).
+		WillReturnResult(sqlmock.NewResult(int64(1), 1))
+
+	s.mock.ExpectCommit()
+
+	if err = s.db.Create(&s.student).Error; err != nil {
+		t.Errorf("Failed to insert to gorm db, got error: %v", err)
+		t.FailNow()
+	}
+
+	err = s.mock.ExpectationsWereMet()
+	if err != nil {
+		t.Errorf("Failed to meet expectations, got error: %v", err)
+	}
+}
+
+func TestGORMV2_Working(t *testing.T) {
+	type Student struct {
+		ID   string `gorm:"primaryKey,autoIncrement"`
+		Name string `gorm:"type:varchar(50);not null"`
+	}
+	type v2Suite struct {
+		db      *gorm.DB
+		mock    sqlmock.Sqlmock
+		student Student
+	}
+
+	s := &v2Suite{}
+	var (
+		db  *sql.DB
+		err error
+	)
+
+	db, s.mock, err = sqlmock.New()
+	if err != nil {
+		t.Errorf("Failed to open mock sql db, got error: %v", err)
+	}
+
+	if db == nil {
+		t.Error("mock db is null")
+	}
+
+	if s.mock == nil {
+		t.Error("sqlmock is null")
+	}
+
+	s.db, err = gorm.Open(postgres.New(
+		postgres.Config{
+			Conn:       db,
+			DriverName: "postgres",
+		},
+	), &gorm.Config{})
+	if err != nil {
+		panic(err) // Error here
+	}
+
+	defer db.Close()
+
+	s.student = Student{
+		Name: "Test 1",
+	}
+
+	defer db.Close()
+
+	s.mock.ExpectBegin()
+
+	s.mock.ExpectExec(
+		regexp.QuoteMeta(`INSERT INTO "students" ("id","name") VALUES ($1,$2)`)).
+		WithArgs("", s.student.Name).
+		WillReturnResult(sqlmock.NewResult(int64(1), 1))
+
+	s.mock.ExpectCommit()
+
+	if err = s.db.Create(&s.student).Error; err != nil {
+		t.Errorf("Failed to insert to gorm db, got error: %v", err)
+		t.FailNow()
+	}
+
+	err = s.mock.ExpectationsWereMet()
+	if err != nil {
+		t.Errorf("Failed to meet expectations, got error: %v", err)
+	}
+}
+
+func TestGORMV2_ID_Working(t *testing.T) {
+
+	type Student struct {
+		gorm.Model
+		Name string `gorm:"type:varchar(50);not null"`
+	}
+	type v2Suite struct {
+		db      *gorm.DB
+		mock    sqlmock.Sqlmock
+		student Student
+	}
+
+	s := &v2Suite{}
+	var (
+		db  *sql.DB
+		err error
+	)
+
+	db, s.mock, err = sqlmock.New()
+	if err != nil {
+		t.Errorf("Failed to open mock sql db, got error: %v", err)
+	}
+
+	if db == nil {
+		t.Error("mock db is null")
+	}
+
+	if s.mock == nil {
+		t.Error("sqlmock is null")
+	}
+
+	s.db, err = gorm.Open(postgres.New(
+		postgres.Config{
+			Conn:       db,
+			DriverName: "postgres",
+		},
+	), &gorm.Config{})
+	if err != nil {
+		panic(err) // Error here
+	}
+
+	defer db.Close()
+
+	s.student = Student{
+		Name: "Test 1",
+	}
+
+	defer db.Close()
+	addRow := sqlmock.NewRows([]string{"id"}).AddRow("1")
+
+	s.mock.ExpectBegin()
+
+	s.mock.ExpectQuery(`INSERT INTO "students" (.+) VALUES (.+) RETURNING "id"`).WillReturnRows(addRow)
+
+	s.mock.ExpectCommit()
+
+	if err = s.db.Create(&s.student).Error; err != nil {
+		t.Errorf("Failed to insert to gorm db, got error: %v", err)
+		t.FailNow()
+	}
+
+	err = s.mock.ExpectationsWereMet()
+	if err != nil {
+		t.Errorf("Failed to meet expectations, got error: %v", err)
+	}
+}
+
+func TestMain(m *testing.M) {
+
+	code := m.Run()
+
+	os.Exit(code)
+}