error_test.go

package slogx

import (
	"errors"
	"testing"
)

func TestSentinelErrors_NonNilAndDistinct(t *testing.T) {
	t.Parallel()

	errs := []error{ErrNilLogger, ErrInvalidFormat, ErrInvalidLevel, ErrInvalidOutput}

	for _, err := range errs {
		if err == nil {
			t.Fatal("sentinel error is nil")
		}
	}

	for i := range errs {
		for j := i + 1; j < len(errs); j++ {
			if errors.Is(errs[i], errs[j]) {
				t.Fatalf("sentinels must be distinct: %v vs %v", errs[i], errs[j])
			}
		}
	}
}

func TestSentinelErrors_HaveMessages(t *testing.T) {
	t.Parallel()

	cases := map[string]error{
		"logger is nil":  ErrNilLogger,
		"invalid format": ErrInvalidFormat,
		"invalid level":  ErrInvalidLevel,
		"invalid output": ErrInvalidOutput,
	}

	for want, err := range cases {
		if got := err.Error(); got != want {
			t.Errorf("error message: got %q, want %q", got, want)
		}
	}
}