Code from my testing lecture

enterprise.rb

#this is the enterprise class with driver code at the bottom

class Enterprise
  attr_accessor :crew, :loadout, :assignment
  def initialize
    @crew = []
    @loadout = { beam: nil, projectile: nil }
    @assignment = { on_mission: [], on_ship: [], on_leave: [] }
  end

  def beam_up(crewmember)
    @crew << crewmember
  end

  def beam_down(crewmember)
    @crew.delete_if do |staff|
      staff == crewmember
    end
  end

  def assign(crewmember, post)
    @assignment[post] << crewmember
  end

  def arm_beam(weapon)
    @loadout[:beam] = weapon
  end

  def arm_projectile(weapon)
    @loadout[:projectile] = weapon
  end
end

enterprise_d = Enterprise.new
enterprise_d.beam_up("Captain Jean Luc Picard")
enterprise_d.beam_up("Commander William T. Riker")
enterprise_d.beam_up("Lieutenant Commander Natasha Yar")
p enterprise_d.crew[0] == "Captain Jean Luc Picard"
enterprise_d.beam_down("Lieutenant Commander Natasha Yar")
p enterprise_d.crew[2] == nil
enterprise_d.assign("Commander William T. Riker", :on_leave)
p enterprise_d.assignment[:on_leave][0] == "Commander William T. Riker"
enterprise_d.arm_beam("Phaser")
p enterprise_d.loadout[:beam] == "Phaser"
enterprise_d.arm_projectile("Photon Torpedoes")
p enterprise_d.loadout[:projectile] == "Photon Torpedoes"

enterprise_spec.rb

require_relative 'enterprise'

describe Enterprise do
  let(:enterprise_d) { Enterprise.new }
  before(:each) do
    enterprise_d.beam_up('Picard')
  end
  describe '#beam_up' do
    it 'adds a member to the crew array' do
      expect(enterprise_d.crew).to(include('Picard'))
    end
  end
  describe '#beam_down' do
    it 'removes a member from the crew array' do
      enterprise_d.beam_up('Stupid Riker')
      enterprise_d.beam_down('Picard')
      expect(enterprise_d.crew).to_not include('Picard')
    end
  end
end

shuttle_craft.rb

class ShuttleCraft

  def initialize
    @hatch = false
  end

  def open_hatch
    @hatch = true
    'The hatch is now open'
  end

  def hatch_open?
    @hatch
  end
end

shuttle_craft_spec.rb

require_relative 'shuttle_craft'

describe ShuttleCraft do
  let(:shuttle) { ShuttleCraft.new }
  describe '#open_hatch' do
    it 'opens the hatch.' do
      expect(shuttle.open_hatch).to eq('The hatch is now open')
    end
    it 'returns false if the hatch is closed' do
      expect(shuttle.hatch_open?).to eq(false)
    end
    it 'returns true if hatch is open' do
      shuttle.open_hatch
      expect(shuttle.hatch_open?).to eq(true)
    end
  end
end

https://www.relishapp.com/ is a great resource for rspec syntax.