stubbing method which adds error to model

rubyonrails-talk
1

Hi,

I'm trying to stub a method for a model. Although I'm making it work I can't find the best way to do it. This method is supposed to add an error to my instance.

class User < ActiveRecord::Base def my_special_method # ... do somwthing before   errors.add(:name, "wrong name") end

class UserTest < Test::Unit::TestCase def test_with_error   u = User.new   User.any_instance.stubs(:my_special_method).returns(lambda {u.errors.add(:name, "wrong name")})   foo = User.new   foo.my_my_special_method   pp foo.errors # <= works   foo = User.new default_user   foo.my_special_method   pp foo.valid?   pp foo.errors # <= still works end

Only issue with this code is that it throws a warning from Mocha telling me that lambda is deprecated. I can't find a way to make it works in any other way though. def test_with_error_case2   u = User.new   User.any_instance.stubs(:my_special_method).returns(u.errors.add(:name, "wrong name"))   foo = User.new   foo.my_special_method   pp foo.errors # <= can see the error   foo.valid?   foo.my_special_method   pp foo #<= no error has been set end Adding times(n) to the stubs doesn't help me.

Thank you for your help as I'm clearly missing something here

Vince

2

class UserTest < Test::Unit::TestCase def test_with_error u = User.new User.any_instance.stubs(:my_special_method).returns(lambda {u.errors.add(:name, "wrong name")}) foo = User.new foo.my_my_special_method pp foo.errors # <= works foo = User.new default_user foo.my_special_method pp foo.valid? pp foo.errors # <= still works end

Only issue with this code is that it throws a warning from Mocha
telling me that lambda is deprecated. I can't find a way to make it works in
any other way though.

in your lambda, you are referencing u, so when you call
my_special_method on foo, it is still adding the errors to u.
Fundamentally though stubs aren't really suppose to do anything,
whereas you are trying to make them do something.

Fred