91 lines
1.4 KiB
Go
91 lines
1.4 KiB
Go
package logger
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import (
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"io"
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"testing"
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"github.com/pkg/errors"
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"github.com/rs/zerolog"
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"github.com/stretchr/testify/assert"
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)
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var writeCalls int
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type mockedWriter struct {
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wantErr bool
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}
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func (c mockedWriter) Write(p []byte) (int, error) {
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writeCalls++
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if c.wantErr {
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return -1, errors.New("Expected error")
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}
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return len(p), nil
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}
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// Tests that a new writer is only used if it actually works.
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func TestResilientMultiWriter(t *testing.T) {
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tests := []struct {
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name string
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writers []io.Writer
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}{
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{
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name: "All valid writers",
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writers: []io.Writer{
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mockedWriter{
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wantErr: false,
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},
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mockedWriter{
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wantErr: false,
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},
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},
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},
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{
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name: "All invalid writers",
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writers: []io.Writer{
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mockedWriter{
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wantErr: true,
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},
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mockedWriter{
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wantErr: true,
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},
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},
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},
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{
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name: "First invalid writer",
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writers: []io.Writer{
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mockedWriter{
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wantErr: true,
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},
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mockedWriter{
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wantErr: false,
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},
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},
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},
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{
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name: "First valid writer",
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writers: []io.Writer{
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mockedWriter{
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wantErr: false,
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},
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mockedWriter{
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wantErr: true,
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},
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},
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},
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}
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for _, tt := range tests {
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writers := tt.writers
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multiWriter := resilientMultiWriter{writers}
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logger := zerolog.New(multiWriter).With().Timestamp().Logger().Level(zerolog.InfoLevel)
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logger.Info().Msg("Test msg")
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assert.Equal(t, len(writers), writeCalls)
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writeCalls = 0
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}
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}
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