test, clientv3: run examples as integration tests

clientv3/example_cluster_test.go

@@ -37,7 +37,7 @@ func ExampleCluster_memberList() {
 		log.Fatal(err)
 	}
 	fmt.Println("members:", len(resp.Members))
-	// members: 3
+	// Output: members: 3
 }
 
 func ExampleCluster_memberAdd() {

clientv3/example_kv_test.go

@@ -33,13 +33,11 @@ func ExampleKV_put() {
 	defer cli.Close()
 
 	ctx, cancel := context.WithTimeout(context.Background(), requestTimeout)
-	resp, err := cli.Put(ctx, "sample_key", "sample_value")
+	_, err = cli.Put(ctx, "sample_key", "sample_value")
 	cancel()
 	if err != nil {
 		log.Fatal(err)
 	}
-	fmt.Println("current revision:", resp.Header.Revision) // revision start at 1
-	// current revision: 2
 }
 
 func ExampleKV_get() {
@@ -66,7 +64,7 @@ func ExampleKV_get() {
 	for _, ev := range resp.Kvs {
 		fmt.Printf("%s : %s\n", ev.Key, ev.Value)
 	}
-	// foo : bar
+	// Output: foo : bar
 }
 
 func ExampleKV_getWithRev() {
@@ -79,7 +77,7 @@ func ExampleKV_getWithRev() {
 	}
 	defer cli.Close()
 
-	_, err = cli.Put(context.TODO(), "foo", "bar1")
+	presp, err := cli.Put(context.TODO(), "foo", "bar1")
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -89,7 +87,7 @@ func ExampleKV_getWithRev() {
 	}
 
 	ctx, cancel := context.WithTimeout(context.Background(), requestTimeout)
-	resp, err := cli.Get(ctx, "foo", clientv3.WithRev(2))
+	resp, err := cli.Get(ctx, "foo", clientv3.WithRev(presp.Header.Revision))
 	cancel()
 	if err != nil {
 		log.Fatal(err)
@@ -97,7 +95,7 @@ func ExampleKV_getWithRev() {
 	for _, ev := range resp.Kvs {
 		fmt.Printf("%s : %s\n", ev.Key, ev.Value)
 	}
-	// foo : bar1
+	// Output: foo : bar1
 }
 
 func ExampleKV_getSortedPrefix() {
@@ -128,6 +126,7 @@ func ExampleKV_getSortedPrefix() {
 	for _, ev := range resp.Kvs {
 		fmt.Printf("%s : %s\n", ev.Key, ev.Value)
 	}
+	// Output:
 	// key_2 : value
 	// key_1 : value
 	// key_0 : value
@@ -144,13 +143,23 @@ func ExampleKV_delete() {
 	defer cli.Close()
 
 	ctx, cancel := context.WithTimeout(context.Background(), requestTimeout)
-	resp, err := cli.Delete(ctx, "key", clientv3.WithPrefix())
-	cancel()
+	defer cancel()
+
+	// count keys about to be deleted
+	gresp, err := cli.Get(ctx, "key", clientv3.WithPrefix())
 	if err != nil {
 		log.Fatal(err)
 	}
-	fmt.Println("Deleted", resp.Deleted, "keys")
-	// Deleted n keys
+
+	// delete the keys
+	dresp, err := cli.Delete(ctx, "key", clientv3.WithPrefix())
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Println("Deleted all keys:", int64(len(gresp.Kvs)) == dresp.Deleted)
+	// Output:
+	// Deleted all keys: true
 }
 
 func ExampleKV_compact() {
@@ -215,7 +224,7 @@ func ExampleKV_txn() {
 	for _, ev := range gresp.Kvs {
 		fmt.Printf("%s : %s\n", ev.Key, ev.Value)
 	}
-	// key : XYZ
+	// Output: key : XYZ
 }
 
 func ExampleKV_do() {

clientv3/example_lease_test.go

@@ -76,7 +76,7 @@ func ExampleLease_revoke() {
 		log.Fatal(err)
 	}
 	fmt.Println("number of keys:", len(gresp.Kvs))
-	// number of keys: 0
+	// Output: number of keys: 0
 }
 
 func ExampleLease_keepAlive() {
@@ -100,10 +100,14 @@ func ExampleLease_keepAlive() {
 	}
 
 	// the key 'foo' will be kept forever
-	_, err = cli.KeepAlive(context.TODO(), resp.ID)
-	if err != nil {
-		log.Fatal(err)
+	ch, kaerr := cli.KeepAlive(context.TODO(), resp.ID)
+	if kaerr != nil {
+		log.Fatal(kaerr)
 	}
+
+	ka := <-ch
+	fmt.Println("ttl:", ka.TTL)
+	// Output: ttl: 5
 }
 
 func ExampleLease_keepAliveOnce() {
@@ -127,8 +131,11 @@ func ExampleLease_keepAliveOnce() {
 	}
 
 	// to renew the lease only once
-	_, err = cli.KeepAliveOnce(context.TODO(), resp.ID)
-	if err != nil {
-		log.Fatal(err)
+	ka, kaerr := cli.KeepAliveOnce(context.TODO(), resp.ID)
+	if kaerr != nil {
+		log.Fatal(kaerr)
 	}
+
+	fmt.Println("ttl:", ka.TTL)
+	// Output: ttl: 5
 }

clientv3/main_test.go

@@ -0,0 +1,57 @@
+// Copyright 2016 CoreOS, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package clientv3_test
+
+import (
+	"os"
+	"regexp"
+	"strings"
+	"testing"
+
+	"github.com/coreos/etcd/integration"
+	"github.com/coreos/etcd/pkg/testutil"
+)
+
+// TestMain sets up an etcd cluster if running the examples.
+func TestMain(m *testing.M) {
+	useCluster := true // default to running all tests
+	for _, arg := range os.Args {
+		if strings.HasPrefix(arg, "-test.run=") {
+			exp := strings.Split(arg, "=")[1]
+			match, err := regexp.MatchString(exp, "Example")
+			useCluster = (err == nil && match) || strings.Contains(exp, "Example")
+			break
+		}
+	}
+
+	v := 0
+	if useCluster {
+		cfg := integration.ClusterConfig{Size: 3}
+		clus := integration.NewClusterV3(nil, &cfg)
+		endpoints = make([]string, 3)
+		for i := range endpoints {
+			endpoints[i] = clus.Client(i).Endpoints()[0]
+		}
+		v = m.Run()
+		clus.Terminate(nil)
+	} else {
+		v = m.Run()
+	}
+
+	if v == 0 && testutil.CheckLeakedGoroutine() {
+		os.Exit(1)
+	}
+	os.Exit(v)
+}

clientv3/txn_test.go

@@ -17,13 +17,9 @@ package clientv3
 import (
 	"testing"
 	"time"
-
-	"github.com/coreos/etcd/pkg/testutil"
 )
 
 func TestTxnPanics(t *testing.T) {
-	defer testutil.AfterTest(t)
-
 	kv := NewKV(&Client{})
 
 	errc := make(chan string)

pkg/testutil/leak_test.go

@@ -20,10 +20,13 @@ import (
 	"testing"
 )
 
+// so tests pass if given a -run that doesn't include TestSample
+var ranSample = false
+
 func TestMain(m *testing.M) {
 	m.Run()
 	isLeaked := CheckLeakedGoroutine()
-	if !isLeaked {
+	if ranSample && !isLeaked {
 		fmt.Fprintln(os.Stderr, "expected leaky goroutines but none is detected")
 		os.Exit(1)
 	}
@@ -32,6 +35,7 @@ func TestMain(m *testing.M) {
 
 func TestSample(t *testing.T) {
 	defer AfterTest(t)
+	ranSample = true
 	for range make([]struct{}, 100) {
 		go func() {
 			select {}

test

@@ -57,7 +57,8 @@ fi
 
 function unit_tests {
 	echo "Running tests..."
-	go test -timeout 3m ${COVER} ${RACE} -cpu 1,2,4 $@ ${TEST}
+	# only -run=Test so examples can run in integration tests
+	go test -timeout 3m ${COVER} ${RACE} -cpu 1,2,4 -run=Test $@ ${TEST}
 }
 
 function integration_tests {
@@ -66,6 +67,7 @@ function integration_tests {
 	go test -timeout 15m -v -cpu 1,2,4 $@ ${REPO_PATH}/integration
 	go test -timeout 10m -v ${RACE} -cpu 1,2,4 $@ ${REPO_PATH}/clientv3/integration
 	go test -timeout 1m -v -cpu 1,2,4 $@ ${REPO_PATH}/contrib/raftexample
+	go test -timeout 1m -v ${RACE} -cpu 1,2,4 -run=Example $@ ${TEST}
 }
 
 function fmt_tests {