spec_file.rb

RSpec.describe Foo::Bar do

obj = OpenStruct.new(name: 'dummy', ops: '-l -a', post_cmd: true)

it 'should run test 1' do
#test
# will fail if post_cmd is false
end

it 'should run test 2' do
#test
end

context 'obj with post_cmd attribute as false' do
  obj.post_cmd = 'false'
  it 'should run test 3' do
  #test
  end
end