[#493] cmd/node: Add .env file for tests

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

cmd/neofs-node/config/logger/config_test.go

@@ -1,34 +1,30 @@
 package loggerconfig_test
 
 import (
-	"os"
 	"testing"
 
 	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
-	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config/internal"
 	loggerconfig "github.com/nspcc-dev/neofs-node/cmd/neofs-node/config/logger"
 	configtest "github.com/nspcc-dev/neofs-node/cmd/neofs-node/config/test"
 	"github.com/stretchr/testify/require"
 )
 
 func TestLoggerSection_Level(t *testing.T) {
-	configtest.ForEachFileType("../../../../config/example/node", func(c *config.Config) {
-		v := loggerconfig.Level(c)
-		require.Equal(t, "debug", v)
-	})
-
+	t.Run("defaults", func(t *testing.T) {
 		v := loggerconfig.Level(configtest.EmptyConfig())
 		require.Equal(t, loggerconfig.LevelDefault, v)
+	})
+
+	const path = "../../../../config/example/node"
+
+	var fileConfigTest = func(c *config.Config) {
+		v := loggerconfig.Level(c)
+		require.Equal(t, "debug", v)
+	}
+
+	configtest.ForEachFileType(path, fileConfigTest)
 
 	t.Run("ENV", func(t *testing.T) {
-		// TODO: read from file
-		err := os.Setenv(
-			internal.Env("logger", "level"),
-			"debug",
-		)
-		require.NoError(t, err)
-
-		v := loggerconfig.Level(configtest.EmptyConfig())
-		require.Equal(t, "debug", v)
+		configtest.ForEnvFileType(path, fileConfigTest)
 	})
 }

cmd/neofs-node/config/test/config.go

@@ -1,15 +1,30 @@
 package configtest
 
-import "github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
+import (
+	"bufio"
+	"os"
+	"strings"
+
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
+)
 
 func fromFile(path string) *config.Config {
 	var p config.Prm
 
+	os.Clearenv() // ENVs have priority over config files so we do this in tests
+
 	return config.New(p,
 		config.WithConfigFile(path),
 	)
 }
 
+func fromEnvFile(path string) *config.Config {
+	var p config.Prm
+
+	loadEnv(path) // github.com/joho/godotenv can do that as well
+	return config.New(p)
+}
+
 func forEachFile(paths []string, f func(*config.Config)) {
 	for i := range paths {
 		f(fromFile(paths[i]))
@@ -26,9 +41,37 @@ func ForEachFileType(pref string, f func(*config.Config)) {
 	}, f)
 }
 
+// ForEnvFileType creates config from `<pref>.env` file.
+func ForEnvFileType(pref string, f func(*config.Config)) {
+	f(fromEnvFile(pref + ".env"))
+}
+
 // EmptyConfig returns config without any values and sections.
 func EmptyConfig() *config.Config {
 	var p config.Prm
 
 	return config.New(p)
 }
+
+// loadEnv reads .env file, parses `X=Y` records and sets OS ENVs.
+func loadEnv(path string) {
+	f, err := os.Open(path)
+	if err != nil {
+		panic("can't open .env file")
+	}
+
+	defer f.Close()
+
+	scanner := bufio.NewScanner(f)
+	for scanner.Scan() {
+		pair := strings.Split(scanner.Text(), "=")
+		if len(pair) != 2 {
+			continue
+		}
+
+		err = os.Setenv(pair[0], pair[1])
+		if err != nil {
+			panic("can't set environment variable")
+		}
+	}
+}

config/example/node.env

@@ -0,0 +1 @@
+NEOFS_LOGGER_LEVEL=debug