diff --git a/lib/api/helpers.rb b/lib/api/helpers.rb
index 548bcae..1eed9be 100644
--- a/lib/api/helpers.rb
+++ b/lib/api/helpers.rb
@@ -76,47 +76,10 @@ module API
       objects
     end
 
-#FIXME see if its needed
-#    def paginate(relation)
-#      per_page  = params[:per_page].to_i
-#      paginated = relation.page(params[:page]).per(per_page)
-#      add_pagination_headers(paginated, per_page)
-#
-#      paginated
-#    end
-
     def authenticate!
       unauthorized! unless current_user
     end
 
-#FIXME see if its needed
-#    def authenticated_as_admin!
-#      forbidden! unless current_user.is_admin?
-#    end
-#
-#FIXME see if its needed
-#    def authorize! action, subject
-#      unless abilities.allowed?(current_user, action, subject)
-#        forbidden!
-#      end
-#    end
-#
-#FIXME see if its needed
-#    def can?(object, action, subject)
-#      abilities.allowed?(object, action, subject)
-#    end
-
-    # Checks the occurrences of required attributes, each attribute must be present in the params hash
-    # or a Bad Request error is invoked.
-    #
-    # Parameters:
-    #   keys (required) - A hash consisting of keys that must be present
-    def required_attributes!(keys)
-      keys.each do |key|
-        bad_request!(key) unless params[key].present?
-      end
-    end
-
     # Checks the occurrences of uniqueness of attributes, each attribute must be present in the params hash
     # or a Bad Request error is invoked.
     #
@@ -135,8 +98,11 @@ module API
       end
       attrs
     end
+    
+    ##########################################
+    #              error helpers             #
+    ##########################################
 
-    # error helpers
     def forbidden!
       render_api_error!('403 Forbidden', 403)
     end
@@ -203,6 +169,19 @@ module API
       20
     end
 
+    def parse_content_type(content_type)
+      return nil if content_type.blank?
+      content_type.split(',').map do |content_type|
+        content_type.camelcase
+      end
+    end
+
+    def period(from_date, until_date)
+      begin_period = from_date.nil? ? Time.at(0).to_datetime : from_date
+      end_period = until_date.nil? ? DateTime.now : until_date
+
+      begin_period..end_period
+    end
 
   end
 end
diff --git a/lib/api/session.rb b/lib/api/session.rb
index 568e16f..d639b10 100644
--- a/lib/api/session.rb
+++ b/lib/api/session.rb
@@ -26,8 +26,12 @@ module API
     #   login                             - login
     # Example Request:
     #   POST /register?email=some@mail.com&password=pas&login=some
-    post "/register" do
-      required_attributes! [:email, :login, :password]
+    params do
+      requires :email, type: String, desc: _("Email")
+      requires :login, type: String, desc: _("Login")
+      requires :password, type: String, desc: _("Password")
+    end
+    get "/register" do
       unique_attributes! User, [:email, :login]
       attrs = attributes_for_keys [:email, :login, :password]
       attrs[:password_confirmation] = attrs[:password]
diff --git a/test/unit/api/helpers_test.rb b/test/unit/api/helpers_test.rb
index debb838..ff6d907 100644
--- a/test/unit/api/helpers_test.rb
+++ b/test/unit/api/helpers_test.rb
@@ -4,45 +4,153 @@ class APITest < ActiveSupport::TestCase
 
   include API::APIHelpers
 
-#  def setup
-#    login_api
+  should 'get the current user with valid token' do
+    user = create_user('someuser')
+    user.generate_private_token!
+    self.params = {:private_token => user.private_token}
+    assert_equal user, current_user
+  end
+
+  should 'not get the current user with expired token' do
+    user = create_user('someuser')
+    user.generate_private_token!
+    user.private_token_generated_at = DateTime.now.prev_year
+    user.save
+    self.params = {:private_token => user.private_token}
+    assert_nil current_user
+  end
+
+  should 'get the person of current user' do
+    user = create_user('someuser')
+    user.generate_private_token!
+    self.params = {:private_token => user.private_token}
+    assert_equal user.person, current_person
+  end
+
+#  #FIXME see how to make this test. Get the current_user variable
+#  should 'set current_user to nil after logout' do
+#    user = create_user('someuser')
+#    user.stubs(:private_token_expired?).returns(false)
+#    User.stubs(:find_by_private_token).returns(user)
+#    assert_not_nil current_user
+#    assert false
+#    logout
 #  end
 
-  should 'get the current user' do
+  should 'limit be defined as the params limit value' do
+    local_limit = 30
+    self.params= {:limit => local_limit}
+    assert_equal local_limit, limit 
+  end
+
+  should 'return default limit if the limit parameter is minor than zero' do
+    self.params= {:limit => -1}
+    assert_equal 20, limit 
+  end
+
+  should 'the default limit be 20' do
+    assert_equal 20, limit 
+  end
+
+  should 'the beginning of the period be the first existent date if no from date is passsed as parameter' do
+    assert_equal Time.at(0).to_datetime, period(nil, nil).to_a[0]
+  end 
+
+  should 'the beginning of the period be from date passsed as parameter' do
+    from = DateTime.now
+    assert_equal from, period(from, nil).min
+  end 
+
+  should 'the end of the period be now if no until date is passsed as parameter' do
+    assert_in_delta DateTime.now, period(nil, nil).max
+  end 
+
+  should 'the end of the period be until date passsed as parameter' do
+    until_date = DateTime.now
+    assert_equal until_date, period(nil, until_date).max
+  end 
+
+  should 'parse_content_type return nil if its blank' do
+    assert_nil parse_content_type("")
+  end
+
+  should 'parse_content_type be an array' do
+    assert_kind_of Array, parse_content_type("text_article")
+  end
+
+  should 'parse_content_type return all content types as an array' do
+    assert_equivalent ['TextArticle','TinyMceArticle'], parse_content_type("TextArticle,TinyMceArticle")
+  end
+
+  should 'find_article return article by id in list passed for user with permission' do 
     user = create_user('someuser')
-#    params = {:private_token => user.private_token}
-#    post "/api/v1/login?#{params.to_query}"
-#    json = JSON.parse(last_response.body)
+    a = fast_create(Article, :profile_id => user.person.id)
+    fast_create(Article, :profile_id => user.person.id)
+    fast_create(Article, :profile_id => user.person.id)
+ 
+    user.generate_private_token!
     User.expects(:find_by_private_token).returns(user)
-    assert_equal user, current_user
-#   
-#    assert !json["private_token"].blank?
+    assert_equal a, find_article(user.person.articles, a.id)
   end
 
-#  should 'return 401 when login fails' do
-#    user.destroy
-#    params = {:login => "testapi", :password => "testapi"}
-#    post "/api/v1/login?#{params.to_query}"
-#    assert_equal 401, last_response.status
-#  end
-#
-#  should 'register a user' do
-#    params = {:login => "newuserapi", :password => "newuserapi", :email => "newuserapi@email.com" }
-#    post "/api/v1/register?#{params.to_query}"
-#    assert_equal 201, last_response.status
-#  end
-#
-#  should 'do not register a user without email' do
-#    params = {:login => "newuserapi", :password => "newuserapi", :email => nil }
-#    post "/api/v1/register?#{params.to_query}"
-#    assert_equal 400, last_response.status
-#  end
-#
-#  should 'do not register a duplicated user' do
-#    params = {:login => "newuserapi", :password => "newuserapi", :email => "newuserapi@email.com" }
-#    post "/api/v1/register?#{params.to_query}"
-#    post "/api/v1/register?#{params.to_query}"
-#    assert_equal 400, last_response.status
-#  end
-#
+  should 'find_article return forbidden when a user try to access an article without permission' do 
+    user = create_user('someuser')
+    p = fast_create(Profile)
+    a = fast_create(Article, :published => false, :profile_id => p.id)
+    fast_create(Article, :profile_id => p.id)
+ 
+    user.generate_private_token!
+    User.expects(:find_by_private_token).returns(user)
+    assert_equal 403, find_article(p.articles, a.id).last
+  end
+
+  should 'make_conditions_with_parameter return no created at parameter if it was not defined from or until parameters' do
+    assert_nil make_conditions_with_parameter[:created_at]
+  end
+
+  should 'make_conditions_with_parameter return created_at parameter if from period is defined' do
+    assert_not_nil make_conditions_with_parameter(:from => '2010-10-10')[:created_at]
+  end
+
+  should 'make_conditions_with_parameter return created_at parameter if until period is defined' do
+    assert_not_nil make_conditions_with_parameter(:until => '2010-10-10')[:created_at]
+  end
+
+#  should 'the beginning of the period be the first existent date if no from date is passsed as parameter' do
+  should 'make_conditions_with_parameter return created_at as the first existent date as parameter if only until is defined' do
+    assert_equal Time.at(0).to_datetime, make_conditions_with_parameter(:until => '2010-10-10')[:created_at].min
+  end
+
+  should 'make_conditions_with_parameter: the minimal created_at date be the from date passed as parameter' do
+    date = '2010-10-10'
+    assert_equal DateTime.parse(date), make_conditions_with_parameter(:from => date)[:created_at].min
+  end
+
+  should 'make_conditions_with_parameter: the maximum created_at date be the until date passed as parameter' do
+    date = '2010-10-10'
+    assert_equal DateTime.parse(date), make_conditions_with_parameter(:until => date)[:created_at].max
+  end
+
+  should 'make_conditions_with_parameter return the until date passed as parameter' do
+    date = '2010-10-10'
+    assert_equal DateTime.parse(date), make_conditions_with_parameter(:from => '2010-10-10')[:created_at].min
+  end
+
+  should 'make_conditions_with_parameter return no type parameter if it was not defined any content type' do
+    assert_nil make_conditions_with_parameter[:type]
+  end
+
+  protected
+
+  def error!(info, status)
+    [info, status]
+  end
+
+  def params
+    @params ||= {}
+  end
+
+  def params= value
+    @params = value
+  end
 end
--
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