mvcc/backend tests: Refactor: Do not mix testing&prod code.

server/mvcc/backend/testing/betesting.go

@@ -0,0 +1,52 @@
+// Copyright 2021 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 betesting
+
+import (
+	"io/ioutil"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"go.etcd.io/etcd/server/v3/mvcc/backend"
+	"go.uber.org/zap/zaptest"
+)
+
+func NewTmpBackendFromCfg(t testing.TB, bcfg backend.BackendConfig) (backend.Backend, string) {
+	dir, err := ioutil.TempDir(t.TempDir(), "etcd_backend_test")
+	if err != nil {
+		panic(err)
+	}
+	tmpPath := filepath.Join(dir, "database")
+	bcfg.Path = tmpPath
+	bcfg.Logger = zaptest.NewLogger(t)
+	return backend.New(bcfg), tmpPath
+}
+
+// NewTmpBackend creates a backend implementation for testing.
+func NewTmpBackend(t testing.TB, batchInterval time.Duration, batchLimit int) (backend.Backend, string) {
+	bcfg := backend.DefaultBackendConfig()
+	bcfg.BatchInterval, bcfg.BatchLimit = batchInterval, batchLimit
+	return NewTmpBackendFromCfg(t, bcfg)
+}
+
+func NewDefaultTmpBackend(t testing.TB) (backend.Backend, string) {
+	return NewTmpBackendFromCfg(t, backend.DefaultBackendConfig())
+}
+
+func Close(t testing.TB, b backend.Backend) {
+	assert.NoError(t, b.Close())
+}