func (s *HostSuite) TestResourceLimits(t *c.C) {
	cmd := exec.JobUsingCluster(
		s.clusterClient(t),
		exec.DockerImage(imageURIs["test-apps"]),
		&host.Job{
			Config:    host.ContainerConfig{Args: []string{"sh", "-c", resourceCmd}},
			Resources: testResources(),
		},
	)
	var out bytes.Buffer
	cmd.Stdout = &out

	runErr := make(chan error)
	go func() {
		runErr <- cmd.Run()
	}()
	select {
	case err := <-runErr:
		t.Assert(err, c.IsNil)
	case <-time.After(30 * time.Second):
		t.Fatal("timed out waiting for resource limits job")
	}

	assertResourceLimits(t, out.String())
}

/*
	Make an 'ish' application on the given host, returning it when
	it has registered readiness with discoverd.

	User will want to defer cmd.Kill() to clean up.
*/
func makeIshApp(cluster *cluster.Client, h *cluster.Host, dc *discoverd.Client, extraConfig host.ContainerConfig) (*exec.Cmd, *discoverd.Instance, error) {
	// pick a unique string to use as service name so this works with concurrent tests.
	serviceName := "ish-service-" + random.String(6)

	// run a job that accepts tcp connections and performs tasks we ask of it in its container
	cmd := exec.JobUsingCluster(cluster, exec.DockerImage(imageURIs["test-apps"]), &host.Job{
		Config: host.ContainerConfig{
			Args:  []string{"/bin/ish"},
			Ports: []host.Port{{Proto: "tcp"}},
			Env: map[string]string{
				"NAME": serviceName,
			},
		}.Merge(extraConfig),
	})
	cmd.HostID = h.ID()
	if err := cmd.Start(); err != nil {
		return nil, nil, err
	}

	// wait for the job to heartbeat and return its address
	services, err := dc.Instances(serviceName, time.Second*100)
	if err != nil {
		cmd.Kill()
		return nil, nil, err
	}
	if len(services) != 1 {
		cmd.Kill()
		return nil, nil, fmt.Errorf("test setup: expected exactly one service instance, got %d", len(services))
	}

	return cmd, services[0], nil
}

func (s *HostSuite) TestVolumeDeleteOnStop(t *c.C) {
	hosts, err := s.clusterClient(t).Hosts()
	t.Assert(err, c.IsNil)
	t.Assert(hosts, c.Not(c.HasLen), 0)
	h := hosts[0]

	// stream job events so we can wait for cleanup events
	events := make(chan *host.Event)
	stream, err := h.StreamEvents("all", events)
	t.Assert(err, c.IsNil)
	defer stream.Close()
	waitCleanup := func(jobID string) {
		timeout := time.After(30 * time.Second)
		for {
			select {
			case event := <-events:
				if event.JobID == jobID && event.Event == host.JobEventCleanup {
					return
				}
			case <-timeout:
				t.Fatal("timed out waiting for cleanup event")
			}
		}
	}

	for _, deleteOnStop := range []bool{true, false} {
		job := &host.Job{
			Config: host.ContainerConfig{
				Args:       []string{"sh", "-c", "ls -d /foo"},
				DisableLog: true,
			},
		}

		// provision a volume
		req := &ct.VolumeReq{Path: "/foo", DeleteOnStop: deleteOnStop}
		vol, err := utils.ProvisionVolume(req, h, job)
		t.Assert(err, c.IsNil)
		defer h.DestroyVolume(vol.ID)

		// run the job
		cmd := exec.JobUsingCluster(s.clusterClient(t), s.createArtifact(t, "test-apps"), job)
		cmd.HostID = h.ID()
		out, err := cmd.CombinedOutput()
		t.Assert(err, c.IsNil)
		t.Assert(string(out), c.Equals, "/foo\n")

		// wait for a cleanup event
		waitCleanup(job.ID)

		// check if the volume was deleted or not
		vol, err = h.GetVolume(vol.ID)
		if deleteOnStop {
			t.Assert(hh.IsObjectNotFoundError(err), c.Equals, true)
		} else {
			t.Assert(err, c.IsNil)
		}
	}
}

func (s *HostSuite) TestSignalJob(t *c.C) {
	cluster := s.clusterClient(t)

	// pick a host to run the job on
	hosts, err := cluster.Hosts()
	t.Assert(err, c.IsNil)
	client := schedutil.PickHost(hosts)

	// start a signal-service job
	cmd := exec.JobUsingCluster(cluster, exec.DockerImage(imageURIs["test-apps"]), &host.Job{
		Config: host.ContainerConfig{
			Args:       []string{"/bin/signal"},
			DisableLog: true,
		},
	})
	cmd.HostID = client.ID()
	var out bytes.Buffer
	cmd.Stdout = &out
	t.Assert(cmd.Start(), c.IsNil)
	_, err = s.discoverdClient(t).Instances("signal-service", 10*time.Second)
	t.Assert(err, c.IsNil)

	// send the job a signal
	t.Assert(client.SignalJob(cmd.Job.ID, int(syscall.SIGTERM)), c.IsNil)

	// wait for the job to exit
	done := make(chan error)
	go func() {
		done <- cmd.Wait()
	}()
	select {
	case err := <-done:
		t.Assert(err, c.IsNil)
	case <-time.After(12 * time.Second):
		t.Fatal("timed out waiting for job to stop")
	}

	// check the output
	t.Assert(out.String(), c.Equals, "got signal: terminated")
}