tests/integration: Move of naming/snapshot clientv3 tests (and yaml reference)

path change in clientv3/yaml/config_test

git mv clientv3/naming/grpc_test.go         tests/integration/clientv3/grpc_test.go
git mv clientv3/snapshot/*_test.go          tests/integration/snapshot
git mv clientv3/{main_test.go,example_*.go} tests/integration/clientv3/examples/

tests/integration/clientv3/examples/main_test.go

@@ -0,0 +1,78 @@
+// Copyright 2016 The etcd Authors
+//
+// 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 (
+	"fmt"
+	"go.etcd.io/etcd/tests/v3/integration"
+	"go.etcd.io/etcd/v3/clientv3"
+	"go.etcd.io/etcd/v3/pkg/testutil"
+	"google.golang.org/grpc/grpclog"
+	"os"
+	"strings"
+	"testing"
+	"time"
+)
+
+var (
+	dialTimeout    = 5 * time.Second
+	requestTimeout = 10 * time.Second
+	endpoints      = []string{"localhost:2379", "localhost:22379", "localhost:32379"}
+)
+
+// TestMain sets up an etcd cluster if running the examples.
+func TestMain(m *testing.M) {
+	useCluster, hasRunArg := false, false // default to running only Test*
+	for _, arg := range os.Args {
+		if strings.HasPrefix(arg, "-test.run=") {
+			exp := strings.Split(arg, "=")[1]
+			useCluster = strings.Contains(exp, "Example")
+			hasRunArg = true
+			break
+		}
+	}
+	if !hasRunArg {
+		// force only running Test* if no args given to avoid leak false
+		// positives from having a long-running cluster for the examples.
+		os.Args = append(os.Args, "-test.run=Test")
+	}
+
+	var v int
+	if useCluster {
+		// Redirecting outputs to Stderr, such that they not interleave with examples outputs.
+		// Setting it once and before running any of the test such that it not data-races
+		// between HTTP servers running in different tests.
+		clientv3.SetLogger(grpclog.NewLoggerV2(os.Stderr, os.Stderr, os.Stderr))
+
+		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)
+		if err := testutil.CheckAfterTest(time.Second); err != nil {
+			fmt.Fprintf(os.Stderr, "%v", err)
+			os.Exit(1)
+		}
+	} else {
+		v = m.Run()
+	}
+	if v == 0 && testutil.CheckLeakedGoroutine() {
+		os.Exit(1)
+	}
+	os.Exit(v)
+}