def customer_search(key, session) # Tested
      digits = key.gsub(/D+/, '')
      digits = key if (digits == '')
      Customer.joins(:emails, :phone_numbers)
        .where(environment_id: session[:environment_id])
        .where("first_name ~* :key OR last_name ~* :key OR emails.address ~* :key OR phone_numbers.number ~* :digits", key: key, digits: digits)
    end

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

    it 'should perform a customer search' do
      session = {environment_id: 1}
      key     = 'test'
      result  = Customer.customer_search(key, session).all
      expect(result.length).to eq(1)
      expect(result[0].first_name).to eq('Test')
    end

before(:each) do
      @c  = FactoryGirl.create :customer
      Email.create(customer_id: @c.id, address: "customer@gmail.com")
      PhoneNumber.create(customer_id: @c.id, number: "customer@gmail.com")
    end

    it 'should perform a customer search' do
      session = {merchant_id: 1}
      key     = 'test'
      result  = Customer.customer_search(key, session).all
      expect(result.length).to eq(1)
      expect(result[0].first_name).to eq('Test')
    end