before(:each) do
  @user = User.new(username: 'ExampleUser', email: 'user@example.com', timezone: 'Eastern Time (US & Canada)', password: 'example')
end

before(:each) do
  @user = FactoryGirl.create(:user)
end

1) User when username is already taken
     Failure/Error: it { should_not be_valid }
       expected valid? to return false, got true
     # ./spec/models/user_spec.rb:151:in `block (3 levels) in <top (required)>'

  2) User when email address is already taken
     Failure/Error: it { should_not be_valid }
       expected valid? to return false, got true
     # ./spec/models/user_spec.rb:142:in `block (3 levels) in <top (required)>'

Finished in 1.8 seconds
29 examples, 2 failures

describe 'when email address is already taken' do
    before do
      user_with_same_email = @user.dup
      user_with_same_email.email = @user.email.upcase
      user_with_same_email.save
    end
    it { should_not be_valid }
  end

  describe 'when username is already taken' do
    before do
      user_with_same_username = @user.dup
      user_with_same_username.username = @user.username.upcase
      user_with_same_username.save
    end
    it { should_not be_valid }
  end

before(:each) do
  @user = FactoryGirl.build(:user)
end

factory :user do
  sequence :username do |n}
    "user_#{n}"
  end
end

describe User do
  let(:user) { create(:user, :first_name => "John", :last_name => "Doe") }

  it "should get full name" do
    user.full_name.should == "John Doe"
  end
end