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testing.go
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testing.go
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// Copyright 2023 The Berglas Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package logging
import (
"io"
"log/slog"
"math"
"testing"
)
// TestLogger creates a new logger for use in tests. It will only log messages
// when tests fail and the tests were run with verbose (-v).
func TestLogger(tb testing.TB) *slog.Logger {
tb.Helper()
w := &testingWriter{tb}
// Use the lowest possible level (aka log everything). Slog levels are
// arbitrary integers, so by choosing the lowest possible integer, we will
// catch every possible log.
level := slog.Level(math.MinInt)
return slog.New(NewLevelHandler(level, slog.NewTextHandler(w, &slog.HandlerOptions{
AddSource: true,
Level: level,
ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
// Drop time key since the test failures will include timestamps
if a.Key == slog.TimeKey {
return slog.Attr{}
}
return cloudLoggingAttrsEncoder()(groups, a)
},
})))
}
var _ io.Writer = (*testingWriter)(nil)
type testingWriter struct {
tb testing.TB
}
func (t *testingWriter) Write(b []byte) (int, error) {
if !testing.Verbose() {
return 0, nil
}
t.tb.Log(string(b))
return len(b), nil
}