check level, add test

internal/autocert/certmagic_logger_test.go

@@ -0,0 +1,28 @@
+package autocert
+
+import (
+	"bytes"
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+func TestCertMagicLogger(t *testing.T) {
+	t.Parallel()
+
+	encoder := zapcore.NewJSONEncoder(zap.NewProductionEncoderConfig())
+	var buf bytes.Buffer
+	core := zapcore.NewCore(encoder, zapcore.AddSync(&buf), zapcore.DebugLevel)
+	core = certMagicLoggerCore{core: core}
+
+	logger := zap.New(core)
+
+	logger.Info("TEST", zap.Error(errors.New("no OCSP server specified in certificate")))
+	assert.Empty(t, buf.Bytes())
+
+	logger.Info("TEST")
+	assert.NotEmpty(t, buf.Bytes())
+}