adding in logging

vendor/go.uber.org/zap/zaptest/writer.go

@@ -0,0 +1,96 @@
+// Copyright (c) 2016 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package zaptest
+
+import (
+	"bytes"
+	"errors"
+	"io/ioutil"
+	"strings"
+)
+
+// A Syncer is a spy for the Sync portion of zapcore.WriteSyncer.
+type Syncer struct {
+	err    error
+	called bool
+}
+
+// SetError sets the error that the Sync method will return.
+func (s *Syncer) SetError(err error) {
+	s.err = err
+}
+
+// Sync records that it was called, then returns the user-supplied error (if
+// any).
+func (s *Syncer) Sync() error {
+	s.called = true
+	return s.err
+}
+
+// Called reports whether the Sync method was called.
+func (s *Syncer) Called() bool {
+	return s.called
+}
+
+// A Discarder sends all writes to ioutil.Discard.
+type Discarder struct{ Syncer }
+
+// Write implements io.Writer.
+func (d *Discarder) Write(b []byte) (int, error) {
+	return ioutil.Discard.Write(b)
+}
+
+// FailWriter is a WriteSyncer that always returns an error on writes.
+type FailWriter struct{ Syncer }
+
+// Write implements io.Writer.
+func (w FailWriter) Write(b []byte) (int, error) {
+	return len(b), errors.New("failed")
+}
+
+// ShortWriter is a WriteSyncer whose write method never fails, but
+// nevertheless fails to the last byte of the input.
+type ShortWriter struct{ Syncer }
+
+// Write implements io.Writer.
+func (w ShortWriter) Write(b []byte) (int, error) {
+	return len(b) - 1, nil
+}
+
+// Buffer is an implementation of zapcore.WriteSyncer that sends all writes to
+// a bytes.Buffer. It has convenience methods to split the accumulated buffer
+// on newlines.
+type Buffer struct {
+	bytes.Buffer
+	Syncer
+}
+
+// Lines returns the current buffer contents, split on newlines.
+func (b *Buffer) Lines() []string {
+	output := strings.Split(b.String(), "\n")
+	return output[:len(output)-1]
+}
+
+// Stripped returns the current buffer contents with the last trailing newline
+// stripped.
+func (b *Buffer) Stripped() string {
+	return strings.TrimRight(b.String(), "\n")
+}