Add more tests (#1949)

* add more test code

* add more test code

pkg/simple/client/ldap/simple_ldap.go

@@ -0,0 +1,57 @@
+package ldap
+
+import "kubesphere.io/kubesphere/pkg/api/iam"
+
+// simpleLdap is a implementation of ldap.Interface, you should never use this in production env!
+type simpleLdap struct {
+	store map[string]*iam.User
+}
+
+func NewSimpleLdap() Interface {
+	return &simpleLdap{
+		store: map[string]*iam.User{},
+	}
+}
+
+func (s simpleLdap) Create(user *iam.User) error {
+	s.store[user.Username] = user
+	return nil
+}
+
+func (s simpleLdap) Update(user *iam.User) error {
+	_, err := s.Get(user.Username)
+	if err != nil {
+		return err
+	}
+	s.store[user.Username] = user
+	return nil
+}
+
+func (s simpleLdap) Delete(name string) error {
+	_, err := s.Get(name)
+	if err != nil {
+		return err
+	}
+	delete(s.store, name)
+	return nil
+}
+
+func (s simpleLdap) Get(name string) (*iam.User, error) {
+	if user, ok := s.store[name]; !ok {
+		return nil, ErrUserNotExists
+	} else {
+		return user, nil
+	}
+}
+
+func (s simpleLdap) Verify(name string, password string) error {
+	if user, err := s.Get(name); err != nil {
+		return err
+	} else {
+		if user.Password != password {
+			return ErrInvalidCredentials
+		}
+	}
+
+	return nil
+}