rspec test example.

example_spec.rb

describe "foo" do

  subject   { described_class.new(options) }
  let(:var) { "zzzz"}

  before(:each) do
    # do something
  end
  
  context "when bar" do
    it "is sleeping" do
      expect(var).to eq("zzzz")
    end
  end
  
end