Function captureSlog

cmd/cache-proxy/proxy_test.go:80–86

captureSlog redirects slog.Default to a buffer for the duration of a test and returns the buffer + a restore function. Used by the forward-uncached logging tests to assert presence of the request/response log lines that were missing pre-PR (every PUT/POST through the proxy was a black hole).

(t *testing.T)

// logging tests to assert presence of the request/response log lines that
// were missing pre-PR (every PUT/POST through the proxy was a black hole).
//
// The buffer must be concurrency-safe: proxy handlers log from goroutines
// that outlive the request (e.g. the CONNECT close logger fires after both
// tunnel legs finish), so test-goroutine String reads would race an
// unsynchronized bytes.Buffer.
func captureSlog(t *testing.T) (*syncBuffer, func()) {
	t.Helper()
	prev := slog.Default()
	buf := &syncBuffer{}
	slog.SetDefault(slog.New(slog.NewTextHandler(buf, &slog.HandlerOptions{Level: slog.LevelDebug})))