group.Name = "a-security-group-name"
				fakeSecurityGroupRepo.ReadReturns(group, nil)
			})

			JustBeforeEach(func() {
				runCommand("a-security-group-name")
			})

			It("unbinds the group from the default staging group set", func() {
				Expect(ui.Outputs).To(ContainSubstrings(
					[]string{"Unbinding", "security group", "a-security-group-name", "my-user"},
					[]string{"OK"},
				))

				Expect(fakeSecurityGroupRepo.ReadArgsForCall(0)).To(Equal("a-security-group-name"))
				Expect(fakeStagingSecurityGroupsRepo.UnbindFromStagingSetArgsForCall(0)).To(Equal("just-pretend-this-is-a-guid"))
			})
		})

		Context("when the security group does not exist", func() {
			BeforeEach(func() {
				fakeSecurityGroupRepo.ReadReturns(models.SecurityGroup{}, errors.NewModelNotFoundError("security group", "anana-qui-parle"))
			})

			It("warns the user", func() {
				runCommand("anana-qui-parle")
				Expect(ui.WarnOutputs).To(ContainSubstrings(
					[]string{"Security group", "anana-qui-parle", "does not exist"},
				))

				Expect(ui.Outputs).To(ContainSubstrings(