NoMethodError: undefined method while running test

I run the command: ruby test/unit/user_test.rb

I get the error:
NoMethodError: undefined method `authenticate' for #<Class:0x193dd20>
    C:/Ruby19/lib/ruby/gems/1.9.1/gems/activerecord-2.3.5/lib/active_record/base
.rb:1959:in `method_missing'
    test/unit/user_test.rb:13:in `test_auth'
The authenticate method is defined in

This is denition of authenticate method in modes/user.rb
class UserTest < ActiveSupport::TestCase
  # Replace this with your real tests.
  # test "the truth" do
  # assert true
  self.use_instantiated_fixtures = true
  fixtures :users
def self.authenticate(login, pass)
  u=find(:first, :conditions=>["login = ?", login])
  return nil if u.nil?
  return u if User.encrypt(pass, u.salt)==u.hashed_password
  nil
end

This is where it is called from user_test.rb
def test_auth
  assert_equal @bob, User.authenticate("rao", "test")
end

username rao is already defined in users.yml

Can someone please tell me how to fix this?

Sorry, there was a mistake in my posting. The correction to user_test.rb
def test_auth
   assert_equal @rao, User.authenticate("rao", "test")
end
where user rao has been defined in users.yml

I get this error NoMethodError: undefined method `authenticate'
When the method 'authenticate' is already defined. Why is it unable to
find the method?

Vishwa Rao wrote:

I run the command: ruby test/unit/user_test.rb

I get the error:
NoMethodError: undefined method `authenticate' for #<Class:0x193dd20>
C:/Ruby19/lib/ruby/gems/1.9.1/gems/activerecord-2.3.5/lib/active_record/base
.rb:1959:in `method_missing'
test/unit/user_test.rb:13:in `test_auth'
The authenticate method is defined in

This is denition of authenticate method in modes/user.rb
class UserTest < ActiveSupport::TestCase
# Replace this with your real tests.
# test "the truth" do
# assert true
self.use_instantiated_fixtures = true
fixtures :users
def self.authenticate(login, pass)

You have this inside class UserTest instead of User

Colin