[#493] node/config/logger: Write unit tests

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

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

@@ -0,0 +1,27 @@
+package loggerconfig_test
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
+	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) {
+	checkLevel := func(c *loggerconfig.LoggerSection, expected string) {
+		lvl := c.Level()
+		require.Equal(t, expected, lvl)
+	}
+
+	configtest.ForEachFileType("../../../../config/example/node", func(c *config.Config) {
+		cfg := loggerconfig.Init(c)
+
+		checkLevel(cfg, "debug")
+	})
+
+	empty := loggerconfig.Init(configtest.EmptyConfig())
+
+	checkLevel(empty, loggerconfig.LevelDefault)
+}