[#xx] cmd/common: Add tests for CreateViper and ReloadViper

Add tests for `CreateViper` and `ReloadViper` to ensure that no extra
files, except *.yaml, *.yml, *.json, are loaded from config directory.

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

cmd/internal/common/config/viper_test.go

@@ -0,0 +1,107 @@
+package config_test
+
+import (
+	"encoding/json"
+	"os"
+	"path"
+	"testing"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common/config"
+	configtest "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/config/test"
+	"github.com/spf13/viper"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"gopkg.in/yaml.v3"
+)
+
+func TestCreateReloadViper(t *testing.T) {
+	type m = map[string]any
+
+	dummyFileSize := 1 << 10
+
+	configPath := t.TempDir()
+	configFile := "000_a.yaml"
+
+	configDirPath := path.Join(configPath, "conf.d")
+	require.NoError(t, os.Mkdir(configDirPath, 0o700))
+
+	configtest.PrepareConfigFiles(t, configPath, []configtest.ConfigFile{
+		configtest.NewConfigFile(configFile, m{"a": "000"}, yaml.Marshal),
+	})
+
+	// Not valid configs, dummy files those appear lexicographically first.
+	configtest.PrepareDummyFiles(t, configDirPath, []configtest.DummyFile{
+		configtest.NewDummyFile("000_file_1", dummyFileSize),
+		configtest.NewDummyFile("000_file_2", dummyFileSize),
+		configtest.NewDummyFile("000_file_3", dummyFileSize),
+	})
+
+	configtest.PrepareConfigFiles(t, configDirPath, []configtest.ConfigFile{
+		// Valid configs with invalid extensions those appear lexicographically first.
+		configtest.NewConfigFile("001_a.yaml.un~", m{"a": "101"}, yaml.Marshal),
+		configtest.NewConfigFile("001_b.yml~", m{"b": m{"a": "102", "b": "103"}}, yaml.Marshal),
+		configtest.NewConfigFile("001_c.yaml.swp", m{"c": m{"a": "104", "b": "105"}}, yaml.Marshal),
+		configtest.NewConfigFile("001_d.json.swp", m{"d": m{"a": "106", "b": "107"}}, json.Marshal),
+
+		// Valid configs with valid extensions those should be loaded.
+		configtest.NewConfigFile("010_a.yaml", m{"a": "1"}, yaml.Marshal),
+		configtest.NewConfigFile("020_b.yml", m{"b": m{"a": "2", "b": "3"}}, yaml.Marshal),
+		configtest.NewConfigFile("030_c.json", m{"c": m{"a": "4", "b": "5"}}, json.Marshal),
+
+		// Valid configs with invalid extensions those appear lexicographically last.
+		configtest.NewConfigFile("099_a.yaml.un~", m{"a": "201"}, yaml.Marshal),
+		configtest.NewConfigFile("099_b.yml~", m{"b": m{"a": "202", "b": "203"}}, yaml.Marshal),
+		configtest.NewConfigFile("099_c.yaml.swp", m{"c": m{"a": "204", "b": "205"}}, yaml.Marshal),
+		configtest.NewConfigFile("099_c.json.swp", m{"d": m{"a": "206", "b": "207"}}, json.Marshal),
+	})
+
+	// Not valid configs, dummy files those appear lexicographically last.
+	configtest.PrepareDummyFiles(t, configDirPath, []configtest.DummyFile{
+		configtest.NewDummyFile("999_file_1", dummyFileSize),
+		configtest.NewDummyFile("999_file_2", dummyFileSize),
+		configtest.NewDummyFile("999_file_3", dummyFileSize),
+	})
+
+	finalConfig := m{"a": "1", "b": m{"a": "2", "b": "3"}, "c": m{"a": "4", "b": "5"}}
+
+	var (
+		v   *viper.Viper
+		err error
+	)
+
+	t.Run("create config with config dir only", func(t *testing.T) {
+		v, err = config.CreateViper(
+			config.WithConfigDir(configDirPath),
+		)
+		require.NoError(t, err)
+		assert.Equal(t, finalConfig, v.AllSettings())
+	})
+
+	t.Run("reload config with config dir only", func(t *testing.T) {
+		err = config.ReloadViper(
+			config.WithViper(v),
+			config.WithConfigDir(configDirPath),
+		)
+		require.NoError(t, err)
+		assert.Equal(t, finalConfig, v.AllSettings())
+	})
+
+	t.Run("create config with both config and config dir", func(t *testing.T) {
+		v, err = config.CreateViper(
+			config.WithConfigFile(path.Join(configPath, configFile)),
+			config.WithConfigDir(configDirPath),
+		)
+		require.NoError(t, err)
+		assert.Equal(t, finalConfig, v.AllSettings())
+	})
+
+	t.Run("reload config with both config and config dir", func(t *testing.T) {
+		err = config.ReloadViper(
+			config.WithViper(v),
+			config.WithConfigFile(path.Join(configPath, configFile)),
+			config.WithConfigDir(configDirPath),
+		)
+		require.NoError(t, err)
+		assert.Equal(t, finalConfig, v.AllSettings())
+	})
+}

pkg/util/config/test/generate.go

@@ -0,0 +1,58 @@
+package configtest
+
+import (
+	"crypto/rand"
+	"os"
+	"path"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+type MarshalFunc = func(any) ([]byte, error)
+
+type ConfigFile struct {
+	filename string
+	content  map[string]any
+	marshal  func(any) ([]byte, error)
+}
+
+type DummyFile struct {
+	filename string
+	size     int
+}
+
+func NewConfigFile(filename string, content map[string]any, marshal MarshalFunc) ConfigFile {
+	return ConfigFile{
+		filename: filename,
+		content:  content,
+		marshal:  marshal,
+	}
+}
+
+func NewDummyFile(filename string, size int) DummyFile {
+	return DummyFile{
+		filename: filename,
+		size:     size,
+	}
+}
+
+func PrepareConfigFiles(t *testing.T, dir string, files []ConfigFile) {
+	for _, file := range files {
+		data, err := file.marshal(file.content)
+		require.NoError(t, err)
+
+		err = os.WriteFile(path.Join(dir, file.filename), data, 0o600)
+		require.NoError(t, err)
+	}
+}
+
+func PrepareDummyFiles(t *testing.T, dir string, files []DummyFile) {
+	for _, file := range files {
+		data := make([]byte, file.size)
+		_, _ = rand.Read(data)
+
+		err := os.WriteFile(path.Join(dir, file.filename), data, 0o600)
+		require.NoError(t, err)
+	}
+}