As much as I like ZeroLog for Go logging Slog being added to the standard library fits in with my rule of avoiding 3rd party packages when they are not entirely required hence I have started moving anything I work on over to it.
One thing I find especially annoying however is log messages inside tests. As such here is a quick code snippet which turns off all slog outputs, but only for tests. Stick it into any _test.go file to disable logging outputs for that package.
// A no-op handler that discards all log messages.
type noopHandler struct{}
func (h *noopHandler) Enabled(context.Context, slog.Level) bool { return false }
func (h*noopHandler) Handle(context.Context, slog.Record) error { return nil }
func (h *noopHandler) WithAttrs([]slog.Attr) slog.Handler { return h }
func (h*noopHandler) WithGroup(string) slog.Handler { return h }
// TestMain runs before any tests and applies globally for all tests in the package.
func TestMain(m *testing.M) {
slog.SetDefault(slog.New(&noopHandler{}))
exitVal := m.Run()
os.Exit(exitVal)
}EDIT The nice thing about doing things in public is excellent people can show you better ways to achive things! Anton x’ed/tweeted responded with this https://x.com/ohmypy/status/1866078171340185706 which allows you to condense the above into the below,
// TestMain runs before any tests and applies globally for all tests in the package.
func TestMain(m *testing.M) {
slog.SetDefault(slog.New(slog.NewTextHandler(io.Discard, nil)))
exitVal := m.Run()
os.Exit(exitVal)
}