title: Failing Rspec Test with MongoID , Custom Authentication, Password Digest
body: <p>i have completed the rails tutorial <a href="http://ruby.railstutorial.org/" rel="nofollow">http://ruby.railstutorial.org/</a>, and trying to implement the <a href="http://ruby.railstutorial.org/chapters/modeling-users" rel="nofollow">user model</a>, but in MongoDB, using MongoID. </p>
  
  <p>I have the following code, which is almost exactly the same as the tutorial, yet it's failing on one of the test cases.</p>
  
  <pre><code>class User
    include Mongoid::Document
    include ActiveModel::SecurePassword
  
    attr_accessible :name, :email, :password, :password_confirmation
  
    field :name, type: String
    field :email, type: String
    field :password_digest, type: String
  
    has_secure_password
  
    before_save { |user| user.email = email.downcase }
  
    email_regex = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  
    validates :name, presence: true, length: { maximum: 50}
    validates :email, presence: true, format: { with: email_regex },
                                      uniqueness: { case_sensitive: false }
    validates :password, presence: true, length: { minimum: 5}
    validates :password_confirmation, presence: true
  end
  </code></pre>
  
  <p>and rspec tests:</p>
  
  <p>require 'spec_helper'</p>
  
  <pre><code>describe User do
    before do
       @user = User.new(name: "Example User", email: "user@example.com", 
                       password: "foobar", password_confirmation: "foobar") 
    end
  
    subject { @user }
  
    it { should respond_to(:name) }
    it { should respond_to(:email) }
    it { should respond_to(:password_digest) }
    it { should respond_to(:password) }
    it { should respond_to(:password_confirmation) }
    it { should respond_to(:authenticate) }
  
   describe 'without a name' do
      before { @user.name = "" }
      it { should_not be_valid }
    end
  
   describe 'without an email' do
      before { @user.email = "" }
      it { should_not be_valid }
   end
  
    describe "when name is too long" do
      before { @user.name = "a" * 51 }
      it { should_not be_valid }
    end
  
    describe "when email format is invalid" do
      it "should be invalid" do
        addresses = %w[user@foo,com user_at_foo.org example.user@foo.
                       foo@bar_baz.com foo@bar+baz.com]
        addresses.each do |invalid_address|
          @user.email = invalid_address
          @user.should_not be_valid
        end      
      end
    end
  
    describe "when email format is valid" do
      it "should be valid" do
        addresses = %w[user@foo.COM A_US-ER@f.b.org frst.lst@foo.jp a+b@baz.cn]
        addresses.each do |valid_address|
          @user.email = valid_address
          @user.should be_valid
        end      
      end
    end
  
    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 password is not present" do
      before { @user.password = @user.password_confirmation = " " }
      it { should_not be_valid }
    end
  
    describe "when password doesn't match confirmation" do
      before { @user.password_confirmation = "mismatch" }
      it { should_not be_valid }
    end
  
    describe "when password confirmation is nil" do
      before { @user.password_confirmation = nil }
      it { should_not be_valid }
    end
  
      describe "with a password that's too short" do
      before { @user.password = @user.password_confirmation = "a" * 5 }
      it { should be_invalid }
    end
  
    describe "return value of authenticate method" do
      before { @user.save }
      let(:found_user) { User.find_by(email: @user.email) }
  
      describe "with valid password" do
        it { should == found_user.authenticate(@user.password) }
      end
  
      describe "with invalid password" do
        let(:user_for_invalid_password) { found_user.authenticate("invalid") }
  
        it { should_not == user_for_invalid_password }
        specify { user_for_invalid_password.should be_false }
      end
    end
  end
  </code></pre>
  
  <p>The failure on the spec is:</p>
  
  <pre><code>........F..........
  
  Failures:
  
    1) User return value of authenticate method with valid password 
       Failure/Error: it { should == found_user.authenticate(@user.password) }
         expected: #&lt;User _id: 50e30a678bffa61a9e000001, _type: nil, name: "Example User", email: "user@example.com", password_digest: "$2a$10$C6klW7B9ok4OIHFopy5AfuncvwNYTZqHWTbqpdd8gXmruSLlwizPO"&gt;
              got: #&lt;User _id: 50e30f158bffa6df67000001, _type: nil, name: "Example User", email: "user@example.com", password_digest: "$2a$10$mDCz9JVPXGSvpGBwbyHIsuV/k.lJ/ux1TuvgRzxSLYlIna/CdztN2"&gt; (using ==)
         Diff:
         @@ -1,2 +1,2 @@
         -#&lt;User _id: 50e30a678bffa61a9e000001, _type: nil, name: "Example User", email: "user@example.com", password_digest: "$2a$10$C6klW7B9ok4OIHFopy5AfuncvwNYTZqHWTbqpdd8gXmruSLlwizPO"&gt;
         +#&lt;User _id: 50e30f158bffa6df67000001, _type: nil, name: "Example User", email: "user@example.com", password_digest: "$2a$10$mDCz9JVPXGSvpGBwbyHIsuV/k.lJ/ux1TuvgRzxSLYlIna/CdztN2"&gt;
       # ./spec/models/user_spec.rb:89:in `block (4 levels) in &lt;top (required)&gt;'
  
  Finished in 1.79 seconds
  19 examples, 1 failure
  </code></pre>
  
  <p>Update:</p>
  
  <p>Did a bit more diggig, and querying the test database it seems that the data is not being cleared before each test case.</p>
  
  <p>Updat2:</p>
  
  <p>I have managed to fix this by including the following in my Spec Helper:</p>
  
  <pre><code>  config.before :each do
      Mongoid.purge!
    end
  </code></pre>
  
  <p>But tests are noticeably slower now! any idea how to speed it up?</p>