rspec spec/model/user_spec.rb

describe "validation" do
    context "when user is from google" do
      before do
        @user = User.new(email: "example@gmail.com")
        @user.authentications.build(provider: "google", uid: "1234")
      end

      it "should be valid" do
        @user.valid?.should be_true
      end

      it "should save" do
        @user.save.should be_true
      end
    end

    context "when user is from twitter" do
      before do
        @user = User.new(email: nil)
        @user.authentications.build(provider: "twitter", uid: "1234")
      end

      it "should be valid" do
        @user.valid?.should be_true
      end

      it "should save" do
        @user.save.should be_true
      end
    end
  end

(rdb:1) @user.errors
#<ActiveModel::Errors:0x0000000ca98e98 @base=#<User id: nil, email: "example@gmail.com", encrypted_password: "", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: nil, updated_at: nil, admin: nil, given_names: nil, surname: nil, dob: nil, address: nil, suburb: nil, state: nil, country: nil, phone: nil, interests: nil, venue_manager: nil, nickname: nil, data_entry: nil>, @messages={}>
(rdb:1) @user.valid?
false
(rdb:1) @user.errors
#<ActiveModel::Errors:0x0000000ca98e98 @base=#<User id: nil, email: "example@gmail.com", encrypted_password: "", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: nil, updated_at: nil, admin: nil, given_names: nil, surname: nil, dob: nil, address: nil, suburb: nil, state: nil, country: nil, phone: nil, interests: nil, venue_manager: nil, nickname: nil, data_entry: nil>, @messages={:encrypted_password=>["can't be blank"]}>
(rdb:1)

def password_required?
    authentications.empty? && (!persisted? || password.present? || password_confirmation.present?)
  end