```ruby
# Copyright (C) 2007, 2008, 2009, 2010 The Collaborative Software Foundation
#
# This file is part of TriSano.
#
# TriSano is free software: you can redistribute it and/or modify it under the 
# terms of the GNU Affero General Public License as published by the 
# Free Software Foundation, either version 3 of the License, 
# or (at your option) any later version.
#
# TriSano is distributed in the hope that it will be useful, but 
# WITHOUT ANY WARRANTY; without even the implied warranty of 
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License 
# along with TriSano. If not, see http://www.gnu.org/licenses/agpl-3.0.txt.

require File.dirname(__FILE__) + '/../spec_helper'

describe ParticipationsRiskFactor do

  before do
    @event = Factory.create(:morbidity_event)
    @event.interested_party.risk_factor = @risk_factor
    @event.interested_party.save!
    @risk_factor = @event.interested_party.build_risk_factor
    @risk_factor.save!
  end

  it "should validate expected delivery date" do
    @risk_factor.should validate_date(:pregnancy_due_date)
  end

end
```

Revert "Removes validation on expected delivery date"
user
```ruby
# Copyright (C) 2007, 2008, 2009, 2010 The Collaborative Software Foundation
#
# This file is part of TriSano.
#
# TriSano is free software: you can redistribute it and/or modify it under the 
# terms of the GNU Affero General Public License as published by the 
# Free Software Foundation, either version 3 of the License, 
# or (at your option) any later version.
#
# TriSano is distributed in the hope that it will be useful, but 
# WITHOUT ANY WARRANTY; without even the implied warranty of 
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License 
# along with TriSano. If not, see http://www.gnu.org/licenses/agpl-3.0.txt.

require File.dirname(__FILE__) + '/../spec_helper'

describe ParticipationsRiskFactor do

  before do
    @event = Factory.create(:morbidity_event)
    @event.interested_party.risk_factor = @risk_factor
    @event.interested_party.save!
    @risk_factor = @event.interested_party.build_risk_factor
    @risk_factor.save!
  end

  it "should validate expected delivery date" do
    @risk_factor.should validate_date(:pregnancy_due_date)
    @risk_factor.pregnancy_due_date = @event.created_at - 1.day
    @risk_factor.save
    @risk_factor.errors.on(:pregnancy_due_date).should =~ /must be on or after/
  end

end
```
assistant