I'm setting unit test for api(golang).
It seems to use mocking. But I don't understand how to code to success.
article
├ client
├ api
│ ├ main.go
│ ├ contoroller
│ │ ├ contoroller.go
│ │ └ contoroller_test.go
│ ├ service
│ │ ├ service.go
│ │ └ service_test.go
│ ├ dao
│ │ ├ dao.go
│ │ └ dao_test.go
│ ├ s3
│ │ ├ s3.go
│ │ └ s3_test.go
│ ├ go.mod
│ ├ go.sum
│ └ Dockerfile
├ nginx
└ docker-compose.yml
Now I'm trying to set dao_test.go
But it fails because dao.go
calls method from s3.dao
.
dao_test.go
package dao
// import
type DaoSuite struct {
suite.Suite
db *sql.DB
mock sqlmock.Sqlmock
dao *Dao
s3 *s3.S3
}
func (s *DaoSuite) SetupTest() {
var err error
s.db, s.mock, err = sqlmock.New()
s.Require().NoError(err)
s.dao = NewDao(s.db, s.s3)
}
func (s *DaoSuite) TestDeleteArticleDao() {
// some method
// here test fails because DeleteArticleDao calls method from another package.
s.dao.DeleteArticleDao("1")
}
func (s *DaoSuite) TearDownTest() {
s.db.Close()
s.Assert().NoError(s.mock.ExpectationsWereMet())
}
dao.go
package dao
// import
type Dao struct {
database *sql.DB
s3 *s3.S3
}
func NewDao(database *sql.DB, s3 *s3.S3) *Dao {
objs := &Dao{database: database, s3: s3}
return objs
}
func (d *Dao) DeleteArticleDao(id string) {
//generate imageName
//here calls method in package s3
//here test fails
d.s3.DeleteS3Image(imageName)
}
s3.go
package s3
//import
type S3 struct {
APPID string
SECRET string
}
type DaoInterface interface {
DeleteS3Image(imageName util.ImageName) error
}
func NewS3(appid, secret string) *S3 {
objs := &S3{APPID: appid, SECRET: secret}
return objs
}
func (objs *S3) DeleteS3Image(imageName util.ImageName) error {
// method
}
The full source code is here(fix-test-dao):
https://github.com/jpskgc/article/tree/fix-test-dao
I expect the test success in dao_test.go
.
But the actual is it fails because dao.go
calls method from s3 package
.
I want to know how to mock DeleteS3Image
in package s3 to avoid error and success test.
Here is the error when running go test -v
at dao_test.go
.
$ go test -v
--- FAIL: TestDaoSuite (0.00s)
--- FAIL: TestDaoSuite/TestDeleteArticleDao (0.00s)
dao_test.go:221:
Error Trace: dao_test.go:221
suite.go:122
panic.go:522
panic.go:82
signal_unix.go:390
s3.go:66
dao.go:74
dao_test.go:156
Error: Received unexpected error:
there is a remaining expectation which was not matched: ExpectedBegin => expecting database transaction Begin
Test: TestDaoSuite/TestDeleteArticleDao
suite.go:61: test panicked: runtime error: invalid memory address or nil pointer dereference