diff --git a/spec/factories/clients.rb b/spec/factories/clients.rb
index 598d1c1..5926219 100644
--- a/spec/factories/clients.rb
+++ b/spec/factories/clients.rb
@@ -11,8 +11,6 @@
 
 FactoryGirl.define do
   factory :client do
-    name "MyString"
-key "MyString"
+    name { Faker::Lorem.word }
   end
-
 end
diff --git a/spec/factories/transactions.rb b/spec/factories/transactions.rb
index 5273d51..d0eea9f 100644
--- a/spec/factories/transactions.rb
+++ b/spec/factories/transactions.rb
@@ -14,11 +14,10 @@
 
 FactoryGirl.define do
   factory :transaction do
-    debtor nil
-creditor nil
-amount 1
-origin "MyString"
-message "MyString"
+    association :debtor, factory: :user
+    association :creditor, factory: :user
+    amount { rand(100) }
+    origin 'FactoryGirl'
+    message { Faker::Lorem.sentence }
   end
-
 end
diff --git a/spec/factories/users.rb b/spec/factories/users.rb
index c1ad519..9366357 100644
--- a/spec/factories/users.rb
+++ b/spec/factories/users.rb
@@ -12,7 +12,11 @@
 
 FactoryGirl.define do
   factory :user do
-    
+    name { Faker::Internet.user_name }
+
+    factory :penning do
+      penning true
+    end
   end
 
 end
diff --git a/spec/models/transaction_spec.rb b/spec/models/transaction_spec.rb
index 07cf2b7..805bf63 100644
--- a/spec/models/transaction_spec.rb
+++ b/spec/models/transaction_spec.rb
@@ -15,5 +15,24 @@
 require 'rails_helper'
 
 RSpec.describe Transaction, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  it "has a valid factory" do
+    expect(create(:transaction)).to be_valid
+  end
+
+  describe "cache" do
+    before :each do
+      @user = create(:user)
+    end
+
+    it "should update creditor cache" do
+      trans = build(:transaction, creditor: @user, amount: 10)
+      expect {trans.save!}.to change {@user.balance}.by(10)
+    end
+
+    it "should update debtor cache" do
+      trans = build(:transaction, debtor: @user, amount: 10)
+      expect {trans.save!}.to change {@user.balance}.by(-10)
+    end
+  end
+
 end
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 4a84ec7..cc98894 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -13,5 +13,7 @@
 require 'rails_helper'
 
 RSpec.describe User, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  it "has a valid factory" do
+    expect(create(:user)).to be_valid
+  end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 913e28a..87ddb8c 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -16,7 +16,9 @@
 # users commonly want.
 #
 # See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+require 'factory_girl'
 RSpec.configure do |config|
+  config.include FactoryGirl::Syntax::Methods
   # rspec-expectations config goes here. You can use an alternate
   # assertion/expectation library such as wrong or the stdlib/minitest
   # assertions if you prefer.