Illustrates that before_all applies only to the describe block in which it is defined.

before_all_spec.rb

describe 'a' do
  before(:all) { puts 'a' }
  it 'should be true' do
    puts 'in test a'
  end
end

describe 'b' do
  before(:all) { puts 'b' }
  it 'should be true' do
    puts 'in test b'
  end
end
  
# outputs:
# >  before_all  rspec a_spec.rb
# a
# in test a
# .b
# in test b
# .