feat: traefik-selectel-dns — A-записи Selectel по роутам Traefik + CI сборка образа

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/health/health_test.go

@@ -0,0 +1,40 @@
+package health
+
+import (
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestHandler(t *testing.T) {
+	now := time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC)
+	s := NewState(time.Minute)
+	s.now = func() time.Time { return now }
+	s.started = now
+
+	get := func() (int, string) {
+		rec := httptest.NewRecorder()
+		s.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/healthz", nil))
+		return rec.Code, rec.Body.String()
+	}
+
+	if code, _ := get(); code != 200 {
+		t.Fatalf("сразу после старта: %d", code)
+	}
+	now = now.Add(2 * time.Minute)
+	if code, body := get(); code != 503 || !strings.Contains(body, "stalled") {
+		t.Fatalf("застрял: %d %s", code, body)
+	}
+	s.Record(errors.New("traefik down"))
+	code, body := get()
+	if code != 200 || !strings.Contains(body, "traefik down") {
+		t.Fatalf("ошибка внешней системы не должна делать unhealthy: %d %s", code, body)
+	}
+	s.Record(nil)
+	if _, body := get(); !strings.Contains(body, "lastSuccess") || strings.Contains(body, "lastError") {
+		t.Fatalf("body = %s", body)
+	}
+}