// +build !binary_log

package zerolog

import (
	"bytes"
	"errors"
	"strings"
	"testing"
)

type nilError struct{}

func (nilError) Error() string {
	return ""
}

func TestEvent_AnErr(t *testing.T) {
	tests := []struct {
		name string
		err  error
		want string
	}{
		{"nil", nil, `{}`},
		{"error", errors.New("test"), `{"err":"test"}`},
		{"nil interface", func() *nilError { return nil }(), `{}`},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			var buf bytes.Buffer
			e := newEvent(levelWriterAdapter{&buf}, DebugLevel)
			e.AnErr("err", tt.err)
			_ = e.write()
			if got, want := strings.TrimSpace(buf.String()), tt.want; got != want {
				t.Errorf("Event.AnErr() = %v, want %v", got, want)
			}
		})
	}
}