Add more tests (#1949)

* add more test code

* add more test code

pkg/simple/client/ldap/ldap.go

@@ -27,23 +27,6 @@ import (
 	"time"
 )
 
-type Interface interface {
-	// Create create a new user in ldap
-	Create(user *iam.User) error
-
-	// Update updates a user information, return error if user not exists
-	Update(user *iam.User) error
-
-	// Delete deletes a user from ldap, return nil if user not exists
-	Delete(name string) error
-
-	// Get gets a user by its username from ldap
-	Get(name string) (*iam.User, error)
-
-	//
-	Verify(name string, password string) error
-}
-
 const (
 	ldapAttributeObjectClass       = "objectClass"
 	ldapAttributeCommonName        = "cn"