package urgency

import "testing"

// zeroDeclarer 是一个未声明紧急度的生产者替身：它只实现契约本身。
type zeroDeclarer struct{}

func (zeroDeclarer) Urgency() Level { return LevelRoutine }

// TestLevel_ZeroValueIsRoutine 钉住本通道的默认保守：未声明（零值）与显式声明
// routine 同义，因此既有的、没标紧急度的事件生产者行为逐字不变。
func TestLevel_ZeroValueIsRoutine(t *testing.T) {
	t.Parallel()
	var l Level
	if l != LevelRoutine {
		t.Fatalf("zero Level = %v, want %v", l, LevelRoutine)
	}
	var d Declarer = zeroDeclarer{}
	if got := d.Urgency(); got != LevelRoutine {
		t.Fatalf("undeclared urgency = %v, want %v", got, LevelRoutine)
	}
}

// TestLevel_String 钉住标签稳定（日志、审计与思考记录依赖它）。
func TestLevel_String(t *testing.T) {
	t.Parallel()
	cases := []struct {
		in   Level
		want string
	}{
		{in: LevelRoutine, want: "routine"},
		{in: LevelWarning, want: "warning"},
		{in: LevelCritical, want: "critical"},
		{in: Level(7), want: "urgency(7)"},
	}
	for _, tc := range cases {
		if got := tc.in.String(); got != tc.want {
			t.Fatalf("Level(%d).String() = %q, want %q", int(tc.in), got, tc.want)
		}
	}
}