It("Describes what it is doing to the user", func() {
			Expect(ui.Outputs).To(ContainSubstrings(
				[]string{"Adding", "security-group-name", "as", "my-user"},
				[]string{"OK"},
			))
		})

		It("adds the group to the running group set", func() {
			Expect(fakeSecurityGroupRepo.ReadArgsForCall(0)).To(Equal("security-group-name"))
			Expect(fakeRunningSecurityGroupRepo.AddToRunningSetArgsForCall(0)).To(Equal("being-a-guid"))
		})

		Context("when adding the security group to the running set fails", func() {
			BeforeEach(func() {
				fakeRunningSecurityGroupRepo.AddToRunningSetReturns(errors.New("WOAH. I know kung fu"))
			})

			It("fails and describes the failure to the user", func() {
				Expect(ui.Outputs).To(ContainSubstrings(
					[]string{"FAILED"},
					[]string{"WOAH. I know kung fu"},
				))
			})
		})

		Context("when the security group with the given name cannot be found", func() {
			BeforeEach(func() {
				fakeSecurityGroupRepo.ReadReturns(models.SecurityGroup{}, errors.New("Crème insufficiently brûlée'd"))
			})