Lots of additions:

- added unit tests
- renamed to yadu
- added gh test actions
- added docs

handler_test.go

@@ -0,0 +1,115 @@
+package yadu_test
+
+import (
+	"bytes"
+	"log/slog"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/tlinden/yadu"
+)
+
+type body string
+
+type Ammo struct {
+	Forweapon string
+	Impact    int
+	Cost      int
+	Range     float32
+}
+
+type Enemy struct {
+	Alive  bool
+	Health int
+	Name   string
+	Body   body `yaml:"-"`
+	Ammo   []Ammo
+}
+
+type Tests struct {
+	name   string
+	want   string
+	negate bool
+	opts   *yadu.Options
+}
+
+const testTimeFormat = "03:04.05"
+
+var tests = []Tests{
+	{
+		name:   "has-railgun",
+		want:   "forweapon: Railgun",
+		negate: false,
+	},
+	{
+		name:   "has-ammo",
+		want:   "ammo:",
+		negate: false,
+	},
+	{
+		name:   "has-alive",
+		want:   "alive: true",
+		negate: false,
+	},
+	{
+		name:   "has-no-body",
+		want:   "body:",
+		negate: true,
+	},
+	{
+		name:   "has-time",
+		want:   time.Now().Format(yadu.DefaultTimeFormat),
+		negate: false,
+	},
+	{
+		name: "has-no-time",
+		want: time.Now().Format(yadu.DefaultTimeFormat),
+		opts: &yadu.Options{
+			ReplaceAttr: removeTime,
+		},
+		negate: true,
+	},
+	{
+		name: "has-custom-time",
+		want: time.Now().Format(testTimeFormat),
+		opts: &yadu.Options{
+			TimeFormat: testTimeFormat,
+		},
+		negate: false,
+	},
+	// FIXME: add WithGroup + WithAttr tests
+}
+
+func GetEnemy() *Enemy {
+	return &Enemy{Alive: true, Health: 10, Name: "Bodo", Body: "body\nbody\n",
+		Ammo: []Ammo{{Forweapon: "Railgun", Range: 400, Impact: 100, Cost: 100000}},
+	}
+
+}
+
+func removeTime(_ []string, a slog.Attr) slog.Attr {
+	if a.Key == slog.TimeKey {
+		return slog.Attr{}
+	}
+	return a
+}
+
+func Test(t *testing.T) {
+	t.Parallel()
+
+	for _, tt := range tests {
+		var buf bytes.Buffer
+
+		logger := slog.New(yadu.NewHandler(&buf, tt.opts))
+
+		logger.Info("attack", "enemy", GetEnemy())
+		got := buf.String()
+
+		if strings.Contains(got, tt.want) == tt.negate {
+			t.Errorf("test %s failed.\n want:\n%s\n got: %s\n", tt.name, tt.want, got)
+		}
+
+		buf.Reset()
+	}
+}