fakeConnection.WhenLimitingCPU = func(handle string, limits warden.CPULimits) (warden.CPULimits, error) { return warden.CPULimits{}, disaster } }) It("returns the error", func() { err := container.LimitCPU(warden.CPULimits{}) Ω(err).Should(Equal(disaster)) }) }) }) Describe("LimitDisk", func() { It("sends a limit bandwidth request", func() { err := container.LimitDisk(warden.DiskLimits{ ByteLimit: 1, }) Ω(err).ShouldNot(HaveOccurred()) Ω(fakeConnection.LimitedDisk("some-handle")).Should(ContainElement( warden.DiskLimits{ ByteLimit: 1, }, )) }) Context("when the request fails", func() { disaster := errors.New("oh no!") BeforeEach(func() { fakeConnection.WhenLimitingDisk = func(handle string, limits warden.DiskLimits) (warden.DiskLimits, error) {