Problem writing a unit test using gorm and sql-mock - unit-testing

Question

this is my funckion using package testing, gorm and sql-mock:
func Test_Create(t *testing.T) {
db, mock, err := sqlmock.New()
if err != nil {
t.Errorf("Failed to open mock sql db, got error: %v", err)
}
if db == nil {
t.Error("db is null")
}
if mock == nil {
t.Error("mock is null")
}
defer db.Close()
pDb, err := gorm.Open(postgres.New(postgres.Config{
PreferSimpleProtocol: false,
DriverName: "postgres",
Conn: db,
}))
if err != nil {
t.Fatalf("gorm postgres fatal: %v", err)
}
student := Student{
ID: 12345,
Name: "Test user",
}
mock.ExpectBegin()
mock.ExpectExec(regexp.QuoteMeta(`INSERT INTO "students" ("id","name") VALUES ($1,$2) RETURNING "id"`)).WithArgs(student.ID, student.Name).WillReturnResult(sqlmock.NewResult(student.ID, 1))
mock.ExpectCommit()
err = pDb.Create(student).Error
if err != nil {
t.Error("error:", err)
}
}
I don't understand why I have an error creating a unit test as in the example below, can anyone help?

Answer 1

okay, I've already solved the problem. here's the working func:
func Test_Create(t *testing.T) {
db, mock, err := sqlmock.New()
if err != nil {
t.Errorf("Failed to open mock sql db, got error: %v", err)
}
if db == nil {
t.Error("db is null")
}
if mock == nil {
t.Error("mock is null")
}
defer db.Close()
dialector := postgres.New(postgres.Config{
DSN: "sqlmock_db_0",
DriverName: "postgres",
Conn: db,
PreferSimpleProtocol: true,
})
pDb, err := gorm.Open(dialector, &gorm.Config{})
if err != nil {
t.Fatalf("gorm postgres fatal: %v", err)
}
student := Student{
ID: 12345,
Name: "Test user",
}
mock.ExpectBegin()
mock.ExpectQuery(
regexp.QuoteMeta(`INSERT INTO "students" ("name","id") VALUES ($1,$2) RETURNING "id"`)).
WithArgs(student.Name, student.ID).WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow(student.ID))
mock.ExpectCommit()
if err = pDb.Create(&student).Error; err != nil {
t.Errorf("Failed to insert to gorm db, got error: %v", err)
t.FailNow()
}
err = mock.ExpectationsWereMet()
if err != nil {
t.Errorf("Failed to meet expectations, got error: %v", err)
}
}