Testing validation for Go endpoint payloads with Validate() error {

[echarrod]

I have read the docs on validating, and spotted a test, and example for an auth handler in another test of adding validation.
But when I specify validation for my endpoint, Encore doesn't seem to be going through validation when I call it in my test.

My code:

type CreateUserRequest struct {
	Email     string `json:"email" validate:"required"`
	FirstName string `json:"first_name" validate:"required"`
}

// Validate is applied to the request by encore in the middleware before it is passed to the API function.
func (req *CreateUserRequest) Validate() error {
	validate := validator.New(validator.WithRequiredStructEnabled())
	log.Println("validating struct")
	return validate.Struct(req)
}


// Create creates a user
//
//encore:api auth method=POST path=/users/create
func (s *Service) CreateUser(ctx context.Context, req *CreateUserRequest) (res *CreateUserResponse, err error) {
  ...

I don't see the validation happening, and also don't see my log line in the logs.

EDIT: I notice that it is validating in my live application, but just not from my test, when I run:

svc, err := initService()
assert.Nil(t, err)
...
res, err := svc.CreateUser(context.Background(), &tt.req)

Do I need to call it in a different way in order to get the validation to be applied in tests?

Help would be greatly appreciated!
Thanks