コード例 #1
0
ファイル: store_test.go プロジェクト: rwindelz/etcd
// Ensure that the store can delete a directory if recursive is specified.
func TestStoreDeleteDiretory(t *testing.T) {
	s := newStore()
	// create directory /foo
	s.Create("/foo", true, "", false, Permanent)
	// delete /foo with dir = true and recursive = false
	// this should succeed, since the directory is empty
	e, err := s.Delete("/foo", true, false)
	assert.Nil(t, err, "")
	assert.Equal(t, e.Action, "delete", "")
	// check pervNode
	assert.NotNil(t, e.PrevNode, "")
	assert.Equal(t, e.PrevNode.Key, "/foo", "")
	assert.Equal(t, e.PrevNode.Dir, true, "")

	// create directory /foo and directory /foo/bar
	s.Create("/foo/bar", true, "", false, Permanent)
	// delete /foo with dir = true and recursive = false
	// this should fail, since the directory is not empty
	_, err = s.Delete("/foo", true, false)
	assert.NotNil(t, err, "")

	// delete /foo with dir=false and recursive = true
	// this should succeed, since recursive implies dir=true
	// and recursively delete should be able to delete all
	// items under the given directory
	e, err = s.Delete("/foo", false, true)
	assert.Nil(t, err, "")
	assert.Equal(t, e.Action, "delete", "")

}
コード例 #2
0
ファイル: store_test.go プロジェクト: rwindelz/etcd
func TestSet(t *testing.T) {
	s := newStore()

	// Set /foo=""
	e, err := s.Set("/foo", false, "", Permanent)
	assert.Nil(t, err, "")
	assert.Equal(t, e.Action, "set", "")
	assert.Equal(t, e.Node.Key, "/foo", "")
	assert.False(t, e.Node.Dir, "")
	assert.Equal(t, e.Node.Value, "", "")
	assert.Nil(t, e.Node.Nodes, "")
	assert.Nil(t, e.Node.Expiration, "")
	assert.Equal(t, e.Node.TTL, 0, "")
	assert.Equal(t, e.Node.ModifiedIndex, uint64(1), "")

	// Set /foo="bar"
	e, err = s.Set("/foo", false, "bar", Permanent)
	assert.Nil(t, err, "")
	assert.Equal(t, e.Action, "set", "")
	assert.Equal(t, e.Node.Key, "/foo", "")
	assert.False(t, e.Node.Dir, "")
	assert.Equal(t, e.Node.Value, "bar", "")
	assert.Nil(t, e.Node.Nodes, "")
	assert.Nil(t, e.Node.Expiration, "")
	assert.Equal(t, e.Node.TTL, 0, "")
	assert.Equal(t, e.Node.ModifiedIndex, uint64(2), "")
	// check prevNode
	assert.NotNil(t, e.PrevNode, "")
	assert.Equal(t, e.PrevNode.Key, "/foo", "")
	assert.Equal(t, e.PrevNode.Value, "", "")
	assert.Equal(t, e.PrevNode.ModifiedIndex, uint64(1), "")
	// Set /foo="baz" (for testing prevNode)
	e, err = s.Set("/foo", false, "baz", Permanent)
	assert.Nil(t, err, "")
	assert.Equal(t, e.Action, "set", "")
	assert.Equal(t, e.Node.Key, "/foo", "")
	assert.False(t, e.Node.Dir, "")
	assert.Equal(t, e.Node.Value, "baz", "")
	assert.Nil(t, e.Node.Nodes, "")
	assert.Nil(t, e.Node.Expiration, "")
	assert.Equal(t, e.Node.TTL, 0, "")
	assert.Equal(t, e.Node.ModifiedIndex, uint64(3), "")
	// check prevNode
	assert.NotNil(t, e.PrevNode, "")
	assert.Equal(t, e.PrevNode.Key, "/foo", "")
	assert.Equal(t, e.PrevNode.Value, "bar", "")
	assert.Equal(t, e.PrevNode.ModifiedIndex, uint64(2), "")

	// Set /dir as a directory
	e, err = s.Set("/dir", true, "", Permanent)
	assert.Nil(t, err, "")
	assert.Equal(t, e.Action, "set", "")
	assert.Equal(t, e.Node.Key, "/dir", "")
	assert.True(t, e.Node.Dir, "")
	assert.Equal(t, e.Node.Value, "", "")
	assert.Nil(t, e.Node.Nodes, "")
	assert.Nil(t, e.Node.Expiration, "")
	assert.Equal(t, e.Node.TTL, 0, "")
	assert.Equal(t, e.Node.ModifiedIndex, uint64(4), "")
}
コード例 #3
0
ファイル: store_test.go プロジェクト: rwindelz/etcd
// Ensure that the store cannot delete a directory.
func TestStoreCompareAndDeleteDiretoryFail(t *testing.T) {
	s := newStore()
	s.Create("/foo", true, "", false, Permanent)
	_, _err := s.CompareAndDelete("/foo", "", 0)
	assert.NotNil(t, _err, "")
	err := _err.(*etcdErr.Error)
	assert.Equal(t, err.ErrorCode, etcdErr.EcodeNotFile, "")
}
コード例 #4
0
ファイル: store_test.go プロジェクト: rwindelz/etcd
func TestRootRdOnly(t *testing.T) {
	s := newStore()

	_, err := s.Set("/", true, "", Permanent)
	assert.NotNil(t, err, "")

	_, err = s.Delete("/", true, true)
	assert.NotNil(t, err, "")

	_, err = s.Create("/", true, "", false, Permanent)
	assert.NotNil(t, err, "")

	_, err = s.Update("/", "", Permanent)
	assert.NotNil(t, err, "")

	_, err = s.CompareAndSwap("/", "", 0, "", Permanent)
	assert.NotNil(t, err, "")
}
コード例 #5
0
ファイル: store_test.go プロジェクト: rwindelz/etcd
// Ensure that the store does see hidden key creates if watching deeper than a hidden key in recursive mode.
func TestStoreWatchRecursiveCreateDeeperThanHiddenKey(t *testing.T) {
	s := newStore()
	w, _ := s.Watch("/_foo/bar", true, false, 0)
	s.Create("/_foo/bar/baz", false, "baz", false, Permanent)

	e := nbselect(w.EventChan)
	assert.NotNil(t, e, "")
	assert.Equal(t, e.Action, "create", "")
	assert.Equal(t, e.Node.Key, "/_foo/bar/baz", "")
}
コード例 #6
0
ファイル: store_test.go プロジェクト: rwindelz/etcd
// Ensure that the store can delete a value.
func TestStoreDeleteValue(t *testing.T) {
	s := newStore()
	s.Create("/foo", false, "bar", false, Permanent)
	e, err := s.Delete("/foo", false, false)
	assert.Nil(t, err, "")
	assert.Equal(t, e.Action, "delete", "")
	// check pervNode
	assert.NotNil(t, e.PrevNode, "")
	assert.Equal(t, e.PrevNode.Key, "/foo", "")
	assert.Equal(t, e.PrevNode.Value, "bar", "")
}
コード例 #7
0
ファイル: store_test.go プロジェクト: rwindelz/etcd
func TestStoreCompareAndDeletePrevIndexFailsIfNotMatch(t *testing.T) {
	s := newStore()
	s.Create("/foo", false, "bar", false, Permanent)
	e, _err := s.CompareAndDelete("/foo", "", 100)
	assert.NotNil(t, _err, "")
	err := _err.(*etcdErr.Error)
	assert.Equal(t, err.ErrorCode, etcdErr.EcodeTestFailed, "")
	assert.Equal(t, err.Message, "Compare failed", "")
	assert.Nil(t, e, "")
	e, _ = s.Get("/foo", false, false)
	assert.Equal(t, e.Node.Value, "bar", "")
}
コード例 #8
0
ファイル: store_test.go プロジェクト: rwindelz/etcd
func TestStoreCompareAndDeletePrevIndex(t *testing.T) {
	s := newStore()
	s.Create("/foo", false, "bar", false, Permanent)
	e, err := s.CompareAndDelete("/foo", "", 1)
	assert.Nil(t, err, "")
	assert.Equal(t, e.Action, "compareAndDelete", "")
	// check pervNode
	assert.NotNil(t, e.PrevNode, "")
	assert.Equal(t, e.PrevNode.Key, "/foo", "")
	assert.Equal(t, e.PrevNode.Value, "bar", "")
	assert.Equal(t, e.PrevNode.ModifiedIndex, uint64(1), "")
	assert.Equal(t, e.PrevNode.CreatedIndex, uint64(1), "")
}
コード例 #9
0
ファイル: get_handler_test.go プロジェクト: kennylixi/etcd
// Ensures that a watcher can wait for a value to be set after a given index.
//
//   $ curl -X POST localhost:4001/v1/watch/foo/bar -d index=4
//   $ curl -X PUT localhost:4001/v1/keys/foo/bar -d value=XXX
//   $ curl -X PUT localhost:4001/v1/keys/foo/bar -d value=YYY
//
func TestV1WatchKeyWithIndex(t *testing.T) {
	tests.RunServer(func(s *server.Server) {
		var body map[string]interface{}
		c := make(chan bool)
		go func() {
			v := url.Values{}
			v.Set("index", "3")
			resp, _ := tests.PostForm(fmt.Sprintf("%s%s", s.URL(), "/v1/watch/foo/bar"), v)
			body = tests.ReadBodyJSON(resp)
			c <- true
		}()

		// Make sure response didn't fire early.
		time.Sleep(1 * time.Millisecond)
		assert.Nil(t, body, "")

		// Set a value (before given index).
		v := url.Values{}
		v.Set("value", "XXX")
		resp, _ := tests.PutForm(fmt.Sprintf("%s%s", s.URL(), "/v1/keys/foo/bar"), v)
		tests.ReadBody(resp)

		// Make sure response didn't fire early.
		time.Sleep(1 * time.Millisecond)
		assert.Nil(t, body, "")

		// Set a value (before given index).
		v.Set("value", "YYY")
		resp, _ = tests.PutForm(fmt.Sprintf("%s%s", s.URL(), "/v1/keys/foo/bar"), v)
		tests.ReadBody(resp)

		// A response should follow from the GET above.
		time.Sleep(1 * time.Millisecond)

		select {
		case <-c:

		default:
			t.Fatal("cannot get watch result")
		}

		assert.NotNil(t, body, "")
		assert.Equal(t, body["action"], "set", "")

		assert.Equal(t, body["key"], "/foo/bar", "")
		assert.Equal(t, body["value"], "YYY", "")
		assert.Equal(t, body["index"], 3, "")
	})
}
コード例 #10
0
ファイル: store_test.go プロジェクト: rwindelz/etcd
// Ensure that the store can conditionally update a key if it has a previous value.
func TestStoreCompareAndSwapPrevValue(t *testing.T) {
	s := newStore()
	s.Create("/foo", false, "bar", false, Permanent)
	e, err := s.CompareAndSwap("/foo", "bar", 0, "baz", Permanent)
	assert.Nil(t, err, "")
	assert.Equal(t, e.Action, "compareAndSwap", "")
	assert.Equal(t, e.Node.Value, "baz", "")
	// check pervNode
	assert.NotNil(t, e.PrevNode, "")
	assert.Equal(t, e.PrevNode.Key, "/foo", "")
	assert.Equal(t, e.PrevNode.Value, "bar", "")
	assert.Equal(t, e.PrevNode.ModifiedIndex, uint64(1), "")
	assert.Equal(t, e.PrevNode.CreatedIndex, uint64(1), "")

	e, _ = s.Get("/foo", false, false)
	assert.Equal(t, e.Node.Value, "baz", "")
}
コード例 #11
0
// Ensures that a watcher can wait for a value to be set and return it to the client.
//
//   $ curl localhost:4001/v2/keys/foo/bar?wait=true
//   $ curl -X PUT localhost:4001/v2/keys/foo/bar -d value=XXX
//
func TestV2WatchKey(t *testing.T) {
	tests.RunServer(func(s *server.Server) {
		// There exists a little gap between etcd ready to serve and
		// it actually serves the first request, which means the response
		// delay could be a little bigger.
		// This test is time sensitive, so it does one request to ensure
		// that the server is working.
		tests.Get(fmt.Sprintf("%s%s", s.URL(), "/v2/keys/foo/bar"))

		var watchResp *http.Response
		c := make(chan bool)
		go func() {
			watchResp, _ = tests.Get(fmt.Sprintf("%s%s", s.URL(), "/v2/keys/foo/bar?wait=true"))
			c <- true
		}()

		// Make sure response didn't fire early.
		time.Sleep(1 * time.Millisecond)

		// Set a value.
		v := url.Values{}
		v.Set("value", "XXX")
		resp, _ := tests.PutForm(fmt.Sprintf("%s%s", s.URL(), "/v2/keys/foo/bar"), v)
		tests.ReadBody(resp)

		// A response should follow from the GET above.
		time.Sleep(1 * time.Millisecond)

		select {
		case <-c:

		default:
			t.Fatal("cannot get watch result")
		}

		body := tests.ReadBodyJSON(watchResp)
		assert.NotNil(t, body, "")
		assert.Equal(t, body["action"], "set", "")

		node := body["node"].(map[string]interface{})
		assert.Equal(t, node["key"], "/foo/bar", "")
		assert.Equal(t, node["value"], "XXX", "")
		assert.Equal(t, node["modifiedIndex"], 3, "")
	})
}
コード例 #12
0
// Ensures that a watcher can wait for a value to be set after a given index.
//
//   $ curl localhost:4001/v2/keys/keyindir/bar?wait=true
//   $ curl -X PUT localhost:4001/v2/keys/keyindir -d dir=true -d ttl=1
//   $ curl -X PUT localhost:4001/v2/keys/keyindir/bar -d value=YYY
//
func TestV2WatchKeyInDir(t *testing.T) {
	tests.RunServer(func(s *server.Server) {
		var body map[string]interface{}
		c := make(chan bool)

		// Set a value (before given index).
		v := url.Values{}
		v.Set("dir", "true")
		v.Set("ttl", "1")
		resp, _ := tests.PutForm(fmt.Sprintf("%s%s", s.URL(), "/v2/keys/keyindir"), v)
		tests.ReadBody(resp)

		// Set a value (before given index).
		v = url.Values{}
		v.Set("value", "XXX")
		resp, _ = tests.PutForm(fmt.Sprintf("%s%s", s.URL(), "/v2/keys/keyindir/bar"), v)
		tests.ReadBody(resp)

		go func() {
			resp, _ := tests.Get(fmt.Sprintf("%s%s", s.URL(), "/v2/keys/keyindir/bar?wait=true"))
			body = tests.ReadBodyJSON(resp)
			c <- true
		}()

		// wait for expiration, we do have a up to 500 millisecond delay
		time.Sleep(2000 * time.Millisecond)

		select {
		case <-c:

		default:
			t.Fatal("cannot get watch result")
		}

		assert.NotNil(t, body, "")
		assert.Equal(t, body["action"], "expire", "")

		node := body["node"].(map[string]interface{})
		assert.Equal(t, node["key"], "/keyindir", "")
	})
}
コード例 #13
0
// Ensures that a watcher can wait for a value to be set and return it to the client.
//
//   $ curl localhost:4001/v2/keys/foo/bar?wait=true
//   $ curl -X PUT localhost:4001/v2/keys/foo/bar -d value=XXX
//
func TestV2WatchKey(t *testing.T) {
	tests.RunServer(func(s *server.Server) {
		var body map[string]interface{}
		c := make(chan bool)
		go func() {
			resp, _ := tests.Get(fmt.Sprintf("%s%s", s.URL(), "/v2/keys/foo/bar?wait=true"))
			body = tests.ReadBodyJSON(resp)
			c <- true
		}()

		// Make sure response didn't fire early.
		time.Sleep(1 * time.Millisecond)
		assert.Nil(t, body, "")

		// Set a value.
		v := url.Values{}
		v.Set("value", "XXX")
		resp, _ := tests.PutForm(fmt.Sprintf("%s%s", s.URL(), "/v2/keys/foo/bar"), v)
		tests.ReadBody(resp)

		// A response should follow from the GET above.
		time.Sleep(1 * time.Millisecond)

		select {
		case <-c:

		default:
			t.Fatal("cannot get watch result")
		}

		assert.NotNil(t, body, "")
		assert.Equal(t, body["action"], "set", "")

		node := body["node"].(map[string]interface{})
		assert.Equal(t, node["key"], "/foo/bar", "")
		assert.Equal(t, node["value"], "XXX", "")
		assert.Equal(t, node["modifiedIndex"], 2, "")
	})
}
コード例 #14
0
ファイル: store_test.go プロジェクト: digideskio/etcd
// Ensure that the store can recover from a previously saved state that includes an expiring key.
func TestStoreRecoverWithExpiration(t *testing.T) {
	s := newStore()

	c := make(chan bool)
	defer func() {
		c <- true
	}()
	go mockSyncService(s.DeleteExpiredKeys, c)

	var eidx uint64 = 4
	s.Create("/foo", true, "", false, Permanent)
	s.Create("/foo/x", false, "bar", false, Permanent)
	s.Create("/foo/y", false, "baz", false, time.Now().Add(5*time.Millisecond))
	b, err := s.Save()

	time.Sleep(10 * time.Millisecond)

	s2 := newStore()

	c2 := make(chan bool)
	defer func() {
		c2 <- true
	}()
	go mockSyncService(s2.DeleteExpiredKeys, c2)

	s2.Recovery(b)

	time.Sleep(600 * time.Millisecond)

	e, err := s.Get("/foo/x", false, false)
	assert.Nil(t, err, "")
	assert.Equal(t, e.EtcdIndex, eidx, "")
	assert.Equal(t, *e.Node.Value, "bar", "")

	e, err = s.Get("/foo/y", false, false)
	assert.NotNil(t, err, "")
	assert.Nil(t, e, "")
}
コード例 #15
0
ファイル: get_handler_test.go プロジェクト: kennylixi/etcd
// Ensures that a watcher can wait for a value to be set and return it to the client.
//
//   $ curl localhost:4001/v1/watch/foo/bar
//   $ curl -X PUT localhost:4001/v1/keys/foo/bar -d value=XXX
//
func TestV1WatchKey(t *testing.T) {
	tests.RunServer(func(s *server.Server) {
		var watchResp *http.Response
		c := make(chan bool)
		go func() {
			watchResp, _ = tests.Get(fmt.Sprintf("%s%s", s.URL(), "/v1/watch/foo/bar"))
			c <- true
		}()

		// Make sure response didn't fire early.
		time.Sleep(1 * time.Millisecond)

		// Set a value.
		v := url.Values{}
		v.Set("value", "XXX")
		resp, _ := tests.PutForm(fmt.Sprintf("%s%s", s.URL(), "/v1/keys/foo/bar"), v)
		tests.ReadBody(resp)

		// A response should follow from the GET above.
		time.Sleep(1 * time.Millisecond)

		select {
		case <-c:

		default:
			t.Fatal("cannot get watch result")
		}

		body := tests.ReadBodyJSON(watchResp)
		assert.NotNil(t, body, "")
		assert.Equal(t, body["action"], "set", "")

		assert.Equal(t, body["key"], "/foo/bar", "")
		assert.Equal(t, body["value"], "XXX", "")
		assert.Equal(t, body["index"], 2, "")
	})
}
コード例 #16
0
ファイル: standby_test.go プロジェクト: BREWTAN/etcd
// Create a full cluster and then change the active size.
func TestStandby(t *testing.T) {
	clusterSize := 15
	_, etcds, err := CreateCluster(clusterSize, &os.ProcAttr{Files: []*os.File{nil, os.Stdout, os.Stderr}}, false)
	if !assert.NoError(t, err) {
		t.Fatal("cannot create cluster")
	}
	defer DestroyCluster(etcds)

	resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"syncInterval":1}`))
	if !assert.Equal(t, resp.StatusCode, 200) {
		t.FailNow()
	}

	time.Sleep(time.Second)
	c := etcd.NewClient(nil)
	c.SyncCluster()

	// Verify that we just have default machines.
	result, err := c.Get("_etcd/machines", false, true)
	assert.NoError(t, err)
	assert.Equal(t, len(result.Node.Nodes), 9)

	t.Log("Reconfigure with a smaller active size")
	resp, _ = tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":7, "syncInterval":1}`))
	if !assert.Equal(t, resp.StatusCode, 200) {
		t.FailNow()
	}

	// Wait for two monitor cycles before checking for demotion.
	time.Sleep((2 * server.ActiveMonitorTimeout) + (2 * time.Second))

	// Verify that we now have seven peers.
	result, err = c.Get("_etcd/machines", false, true)
	assert.NoError(t, err)
	assert.Equal(t, len(result.Node.Nodes), 7)

	t.Log("Test the functionality of all servers")
	// Set key.
	time.Sleep(time.Second)
	if _, err := c.Set("foo", "bar", 0); err != nil {
		panic(err)
	}
	time.Sleep(time.Second)

	// Check that all peers and standbys have the value.
	for i := range etcds {
		resp, err := tests.Get(fmt.Sprintf("http://localhost:%d/v2/keys/foo", 4000+(i+1)))
		if assert.NoError(t, err) {
			body := tests.ReadBodyJSON(resp)
			if node, _ := body["node"].(map[string]interface{}); assert.NotNil(t, node) {
				assert.Equal(t, node["value"], "bar")
			}
		}
	}

	t.Log("Reconfigure with larger active size and wait for join")
	resp, _ = tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":8, "syncInterval":1}`))
	if !assert.Equal(t, resp.StatusCode, 200) {
		t.FailNow()
	}

	time.Sleep((1 * time.Second) + (1 * time.Second))

	// Verify that exactly eight machines are in the cluster.
	result, err = c.Get("_etcd/machines", false, true)
	assert.NoError(t, err)
	assert.Equal(t, len(result.Node.Nodes), 8)
}
コード例 #17
0
ファイル: standby_test.go プロジェクト: BREWTAN/etcd
// Create a full cluster and then change the active size dramatically.
func TestStandbyDramaticChange(t *testing.T) {
	clusterSize := 9
	_, etcds, err := CreateCluster(clusterSize, &os.ProcAttr{Files: []*os.File{nil, os.Stdout, os.Stderr}}, false)
	assert.NoError(t, err)
	defer DestroyCluster(etcds)

	if err != nil {
		t.Fatal("cannot create cluster")
	}

	time.Sleep(time.Second)
	c := etcd.NewClient(nil)
	c.SyncCluster()

	num := clusterSize
	for i := 0; i < 3; i++ {
		for inc := 0; inc < 2; inc++ {
			// Verify that we just have i machines.
			result, err := c.Get("_etcd/machines", false, true)
			assert.NoError(t, err)
			assert.Equal(t, len(result.Node.Nodes), num)

			if inc == 0 {
				num -= 6
			} else {
				num += 6
			}

			t.Log("Reconfigure with active size", num)
			resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(fmt.Sprintf(`{"activeSize":%d, "syncInterval":1}`, num)))
			if !assert.Equal(t, resp.StatusCode, 200) {
				t.FailNow()
			}

			if inc == 0 {
				// Wait for monitor cycles before checking for demotion.
				time.Sleep(6*server.ActiveMonitorTimeout + (1 * time.Second))
			} else {
				time.Sleep(time.Second + (1 * time.Second))
			}

			// Verify that we now have peers.
			result, err = c.Get("_etcd/machines", false, true)
			assert.NoError(t, err)
			assert.Equal(t, len(result.Node.Nodes), num)

			t.Log("Test the functionality of all servers")
			// Set key.
			if _, err := c.Set("foo", "bar", 0); err != nil {
				panic(err)
			}
			time.Sleep(100 * time.Millisecond)

			// Check that all peers and standbys have the value.
			for i := range etcds {
				resp, err := tests.Get(fmt.Sprintf("http://localhost:%d/v2/keys/foo", 4000+(i+1)))
				if assert.NoError(t, err) {
					body := tests.ReadBodyJSON(resp)
					if node, _ := body["node"].(map[string]interface{}); assert.NotNil(t, node) {
						assert.Equal(t, node["value"], "bar")
					}
				}
			}
		}
	}
}
コード例 #18
0
ファイル: standby_test.go プロジェクト: nvdnkpr/etcd
// Create a full cluster and then add extra an extra standby node.
func TestStandby(t *testing.T) {
	t.Skip("functionality unimplemented")

	clusterSize := 10 // DefaultActiveSize + 1
	_, etcds, err := CreateCluster(clusterSize, &os.ProcAttr{Files: []*os.File{nil, os.Stdout, os.Stderr}}, false)
	assert.NoError(t, err)
	defer DestroyCluster(etcds)

	if err != nil {
		t.Fatal("cannot create cluster")
	}

	c := etcd.NewClient(nil)
	c.SyncCluster()

	// Set key.
	time.Sleep(time.Second)
	if _, err := c.Set("foo", "bar", 0); err != nil {
		panic(err)
	}
	time.Sleep(time.Second)

	// Check that all peers and standbys have the value.
	for i := range etcds {
		resp, err := tests.Get(fmt.Sprintf("http://localhost:%d/v2/keys/foo", 4000+(i+1)))
		if assert.NoError(t, err) {
			body := tests.ReadBodyJSON(resp)
			if node, _ := body["node"].(map[string]interface{}); assert.NotNil(t, node) {
				assert.Equal(t, node["value"], "bar")
			}
		}
	}

	// Verify that we have one standby.
	result, err := c.Get("_etcd/standbys", false, true)
	assert.NoError(t, err)
	assert.Equal(t, len(result.Node.Nodes), 1)

	// Reconfigure with larger active size (10 nodes) and wait for promotion.
	resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":10, "promoteDelay":1800}`))
	if !assert.Equal(t, resp.StatusCode, 200) {
		t.FailNow()
	}

	time.Sleep(server.ActiveMonitorTimeout + (1 * time.Second))

	// Verify that the standby node is now a peer.
	result, err = c.Get("_etcd/standbys", false, true)
	assert.NoError(t, err)
	assert.Equal(t, len(result.Node.Nodes), 0)

	// Reconfigure with a smaller active size (8 nodes).
	resp, _ = tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":8, "promoteDelay":1800}`))
	if !assert.Equal(t, resp.StatusCode, 200) {
		t.FailNow()
	}

	// Wait for two monitor cycles before checking for demotion.
	time.Sleep((2 * server.ActiveMonitorTimeout) + (1 * time.Second))

	// Verify that we now have eight peers.
	result, err = c.Get("_etcd/machines", false, true)
	assert.NoError(t, err)
	assert.Equal(t, len(result.Node.Nodes), 8)

	// Verify that we now have two standbys.
	result, err = c.Get("_etcd/standbys", false, true)
	assert.NoError(t, err)
	assert.Equal(t, len(result.Node.Nodes), 2)
}