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gistfile1.rb

require 'spec_helper'

shared_examples_for 'employee signin' do
  it { should have_selector('title',     text: employee.emp_full_name) }
  it { should have_link('Sign out',      href: signout_path) }
  it { should_not have_link('Sign in',   href: signin_path) }
end

 describe "Authentication" do

   subject { page }

    describe "signin" do
      before { visit signin_path }

      it { should have_selector('h2',     text: 'Sign in') }
      it { should have_selector('title',  text: 'Sign in') }

      describe "with an employee" do
        let(:employee) { FactoryGirl.create(:employee) }
        before { valid_signin(employee) }

        include_examples 'employee signin' 

        it { should_not have_link('Employees',     href: employees_path) }
        it { should_not have_link('Profile',       href: employee_path(employee)) }
        it { should_not have_link('Settings',      href: edit_employee_path(employee)) }
        it { should_not have_link('New Employee',  href: new_employee_path) }
      end

      describe "with an admin employee" do
        let(:employee) { FactoryGirl.create(:admin_employee) }
        before { valid_signin(employee) }

        include_examples 'employee signin' 

        it { should have_link('Employees',     href: employees_path) }
        it { should have_link('Profile',       href: employee_path(employee)) }
        it { should have_link('Settings',      href: edit_employee_path(employee)) }
        it { should have_link('New Employee',  href: new_employee_path) }
      end
    end
 end

# If you *really* want to get DRY

require 'spec_helper'

shared_context 'employee signin' do |employee_type|
  let(:employee) { FactoryGirl.create(employee_type) }
  before { valid_signin(employee) }

  it { should have_selector('title',     text: employee.emp_full_name) }
  it { should have_link('Sign out',      href: signout_path) }
  it { should_not have_link('Sign in',   href: signin_path) }

  case employee_type
  when :employee
    it { should_not have_link('Employees',     href: employees_path) }
    it { should_not have_link('Profile',       href: employee_path(employee)) }
    it { should_not have_link('Settings',      href: edit_employee_path(employee)) }
    it { should_not have_link('New Employee',  href: new_employee_path) }
  when :admin_employee
    it { should have_link('Employees',     href: employees_path) }
    it { should have_link('Profile',       href: employee_path(employee)) }
    it { should have_link('Settings',      href: edit_employee_path(employee)) }
    it { should have_link('New Employee',  href: new_employee_path) }
  end
end

 describe "Authentication" do

   subject { page }

    describe "signin" do
      before { visit signin_path }

      it { should have_selector('h2',     text: 'Sign in') }
      it { should have_selector('title',  text: 'Sign in') }

      describe "with an employee" do
        include_context 'employee signin', :employee 
      end

      describe "with an admin employee" do
        include_context 'employee signin', :admin_employee
      end
    end
 end

Out of all of the ones listed I like @justinko's 1st version. It's the simplest, clearest, and easiest to understand and change without having to study the code. If you wanted your top-level "authentication" spec to be more declarative then I'd extract the different examples out into two shared contexts. This is similar to @justinko's 2nd version, but avoids the unnecessary case statement.

Here's a take on that:

require 'spec_helper'

shared_context "a user signs in" do
  it { should have_link('Sign out',      href: signout_path) }
  it { should_not have_link('Sign in',   href: signin_path) }
  it { should have_selector('title',     text: employee.emp_full_name) }
end

shared_context 'an employee signs in' do
  let(:employee) { FactoryGirl.create(:employee) }
  before { valid_signin(employee) }

  include_examples "a user signs in"

  it { should_not have_link('Employees',     href: employees_path) }
  it { should_not have_link('Profile',       href: employee_path(employee)) }
  it { should_not have_link('Settings',      href: edit_employee_path(employee)) }
  it { should_not have_link('New Employee',  href: new_employee_path) }
end

shared_context 'an admin employee signs in' do
  let(:employee) { FactoryGirl.create(:admin_employee) }
  before { valid_signin(employee) }

  include_examples "a user signs in"

  it { should have_link('Employees',     href: employees_path) }
  it { should have_link('Profile',       href: employee_path(employee)) }
  it { should have_link('Settings',      href: edit_employee_path(employee)) }
  it { should have_link('New Employee',  href: new_employee_path) }
end

And then in your authentication_spec something like:

describe "Authentication" do
  subject { page }

  describe "signin" do
    before { visit signin_path }

    it { should have_selector('h2',     text: 'Sign in') }
    it { should have_selector('title',  text: 'Sign in') }

    include_examples 'an employee signs in'
    include_examples 'an admin employee signs in'
  end
end