kvdb/etcd: replace defer cleanup with t.Cleanup

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

kvdb/etcd/fixture.go

@@ -21,10 +21,9 @@ const (
 
 // EtcdTestFixture holds internal state of the etcd test fixture.
 type EtcdTestFixture struct {
-	t       *testing.T
-	cli     *clientv3.Client
-	config  *Config
-	cleanup func()
+	t      *testing.T
+	cli    *clientv3.Client
+	config *Config
 }
 
 // NewTestEtcdInstance creates an embedded etcd instance for testing, listening
@@ -47,6 +46,7 @@ func NewEtcdTestFixture(t *testing.T) *EtcdTestFixture {
 	tmpDir := t.TempDir()
 
 	config, etcdCleanup := NewTestEtcdInstance(t, tmpDir)
+	t.Cleanup(etcdCleanup)
 
 	cli, err := clientv3.New(clientv3.Config{
 		Endpoints: []string{config.Host},
@@ -63,10 +63,9 @@ func NewEtcdTestFixture(t *testing.T) *EtcdTestFixture {
 	cli.Lease = namespace.NewLease(cli.Lease, defaultNamespace)
 
 	return &EtcdTestFixture{
-		t:       t,
-		cli:     cli,
-		config:  config,
-		cleanup: etcdCleanup,
+		t:      t,
+		cli:    cli,
+		config: config,
 	}
 }
 
@@ -133,9 +132,3 @@ func (f *EtcdTestFixture) Dump() map[string]string {
 func (f *EtcdTestFixture) BackendConfig() Config {
 	return *f.config
 }
-
-// Cleanup should be called at test fixture teardown to stop the embedded
-// etcd instance and remove all temp db files form the filesystem.
-func (f *EtcdTestFixture) Cleanup() {
-	f.cleanup()
-}