Database Issue

I am using fixture files and the data is being loaded by calling it from within the test file. I only have 4 items within the fixture file. My thinking is that it shouldn't even show something with an id of 5 in the database, should it?

Here is the fixtures file called authors.yml

joel_spolsky:
  id: 1
  first_name: Joel
  last_name: Spolsky
jeremy_keith:
  id: 2
  first_name: Jeremy
  last_name: Keith
christian_hellsten:
  id: 3
  first_name: Christian
  last_name: Hellsten
jarkko_laine:
  id: 4
  first_name: Jarkko
  last_name: Laine

require File.dirname(__FILE__) + '/../../test_helper'
require 'admin/author_controller'
# Re-raise errors caught by the controller.
class Admin::AuthorController; def rescue_action(e) raise e end; end
class Admin::AuthorControllerTest < Test::Unit::TestCase
  fixtures :authors
  def setup
    @controller = Admin::AuthorController.new
    @request    = ActionController::TestRequest.new
    @response   = ActionController::TestResponse.new
  end
  def test_new
    get :new
    assert_template 'admin/author/new'
    assert_tag 'h1', :content => 'Create new author'
    assert_tag 'form', :attributes => {:action => '/admin/author/create'}
  end
  
  def test_create
    get :new
    assert_template 'admin/author/new'
    assert_difference(Author, :count)do
      post :create, :author => {:first_name => 'Joel',
                                :last_name => 'Spolsky'}
      assert_response :redirect
      assert_redirected_to :action => 'index'
  end
  assert_equal 'Author Joel Spolsky was successfully created.', flash[:notice]
  end
  
  def test_failing_create
    assert_no_difference(Author, :count) do
      post :create, :author => {:first_name => 'Joel'}
      assert_response :success
      assert_template 'admin/author/new'
      assert_tag :tag => 'div', :attributes => {:class => 'fieldWithErrors'}
    end
  end
  
 def test_index
    get :index
    assert_response :success
    assert_tag  :tag => 'table',
                :children => { :count => Author.count + 1,
                               :only => {:tag => 'tr'} }
    Author.find(:all).each do |a|
      assert_tag :tag => 'td',
              :content => /Joel/
      assert_tag :tag => 'td',
                 :content => /Spolsky/
    end
  end
  
  def test_show
    get :show, :id => 1
    assert_template 'admin/author/show'
    assert_equal 'Joel', assigns(:author).first_name
    assert_equal 'Spolsky', assigns(:author).last_name
  end
  
  def test_edit
    get :edit, :id => 1
    assert_tag :tag => 'input',
               :attributes => { :name => 'author[first_name]',
                                :value => 'Joel' }
    assert_tag :tag => 'input',
               :attributes => { :name => 'author[last_name]',
                                :value => 'Spolsky' }
    end
    
  def test_update
    post :update, :id => 1, :author => { :first_name => 'Joseph',
                                         :last_name => 'Spolsky' }
    assert_response :redirect
    assert_redirected_to :action => 'show', :id => 1
    assert_equal 'Joseph', Author.find(1).first_name
  end
  
  def test_destroy
    assert_difference(Author, :count, -1) do
      post :destroy, :id => 1
      assert_response :redirect
      assert_redirected_to :action => 'index'
      follow_redirect
      assert_tag :tag => 'div', :attributes => {:id => 'notice'},
                 :content => /Successfully deleted author Joel Spolsky/
      end
  end
  
end

I am now on a different computer and am trying the same application. I no longer am getting the errors that I was previously and everything seems to be working fine. The only thing different between systems is that I am using XAMPP on the system with the errors and on the system without the errors I am using WampServer. They contain different versions of MySQL and PHP but other than that function identically. Would this make a difference when developing with rails?