})

			It("responds with a relevant error message", func() {
				expectedBody, _ := json.Marshal(receptor.Error{
					Type:    receptor.InvalidRequest,
					Message: "process_guid missing from request",
				})

				Expect(responseRecorder.Body.String()).To(Equal(string(expectedBody)))
			})
		})

		Context("when the BBS responds with an error", func() {
			BeforeEach(func(done Done) {
				defer close(done)
				fakeLegacyBBS.UpdateDesiredLRPReturns(errors.New("ka-boom"))
				handler.Update(responseRecorder, req)
			})

			It("calls UpdateDesiredLRP on the BBS", func() {
				Expect(fakeLegacyBBS.UpdateDesiredLRPCallCount()).To(Equal(1))
				_, processGuid, update := fakeLegacyBBS.UpdateDesiredLRPArgsForCall(0)
				Expect(processGuid).To(Equal(expectedProcessGuid))
				Expect(update).To(Equal(expectedUpdate))
			})

			It("responds with 500 INTERNAL ERROR", func() {
				Expect(responseRecorder.Code).To(Equal(http.StatusInternalServerError))
			})

			It("responds with a relevant error message", func() {