[英]How to mock db using sqlmock, the db connection obtained within the function
func loadDataFromDB() Data{
db, err := sql.Open("mysql","user:password@tcp(127.0.0.1:3306)/hello")
if err != nil {
log.Fatal(err)
}
defer db.Close()
rows, err := db.Query("select id, name from users where id = ?", 1)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
// ... Parsing and returning
}
该连接通常应通过参数注入到 function 中。 如何在不修改代码的情况下实现单元测试?
使用数据库相关功能的接口并实现它以使用模拟数据进行测试。请参阅下面的示例代码 -
package app
import (
"errors"
errs "github.com/pkg/errors"
)
type DBSuccess struct {
}
func (d *DBSuccess) SaveGopher(g *Gopher) (string, error) {
return "successid", nil
}
func (d *DBSuccess) GetGopher(id string) (*Gopher, error) {
return &Gopher{
Id: id,
Name: "",
}, nil
}
type DBFailure struct {
}
func (d *DBFailure) SaveGopher(g *Gopher) (string, error) {
return "", errs.Wrap(errors.New("failure in saving to DB"), "failed in saving Gopher")
}
func (d *DBFailure) GetGopher(id string) (*Gopher, error) {
return nil, errs.Wrap(errors.New("failure in getting from DB"), "failed in fetching Gopher")
}
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