A set of specs for defining how the amend group membership form will behave

group_membership_spec.rb

describe GroupMembershipForm do

  let(:group) { Group.new }
  let(:group_id) { 'abc:123'}
  let(:person) { Person.new }
  let(:member_id) { 'abc:456'}
  let(:params) {
    {
      # These are the parameters that are generated in the existing form.
      "group_id" => group_id
      "members_attributes" =>
      {
        "0"=>{"id"=>member_id, "_destroy"=>""},
      }
    }
  }

  subject { GroupMembership.new(params) }
  before(:each) do
    Group.should_receive(:find).with(group_id).and_return(group)
    Person.should_receive(:find).with(member_id).and_return(person)
  end

  context '#save' do
    it 'should append the member to the group' do
      group.should_receive(:add_member).with(person)
      subject.save
    end
  end

  context 'validation' do
    it 'should require a group_id'
    it 'should require a title'
    it 'should require a description'
  end

end