package slog_test

import (

"io"

"sync/atomic"

"testing"

"github.com/gookit/goutil/testutil/assert"

"github.com/gookit/slog"

"github.com/gookit/slog/handler"

)

type countStringer struct{ n *int32 }

func (c countStringer) String() string { atomic.AddInt32(c.n, 1); return "X" }

// regression: a disabled level must not build/format the message at all.

func TestLogger_DisabledLevel_SkipsFormatting(t *testing.T) {

logger := slog.NewWithHandlers(

handler.NewIOWriter(io.Discard, []slog.Level{slog.ErrorLevel}),

)

var cnt int32

for i := 0; i < 100; i++ {

logger.Info("msg", countStringer{&cnt}) // Info is filtered out

}

assert.Eq(t, int32(0), atomic.LoadInt32(&cnt))

// the enabled level still formats

logger.Error("msg", countStringer{&cnt})

assert.Eq(t, int32(1), atomic.LoadInt32(&cnt))

}

// Panic/Fatal must still trigger their side effects even with no matching handler.

func TestLogger_PanicFatal_AlwaysHandled_NoMatchingHandler(t *testing.T) {

logger := slog.NewWithHandlers(

handler.NewIOWriter(io.Discard, []slog.Level{slog.InfoLevel}),

)

panicked := false

logger.PanicFunc = func(v any) { panicked = true }

logger.Panic("boom")

assert.True(t, panicked)

}