Organize backend into product executable and shared Go modules

backend/product/app/health/internal/health_test.go

@@ -0,0 +1,53 @@
+package healthimp
+
+import (
+	"testing"
+
+	"git.sendico.io/tech/sxchnge/product/app/health/status"
+	"github.com/go-chi/chi/v5"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zaptest/observer"
+)
+
+func TestSetStatusLogsOnlyTransitionsWithReason(t *testing.T) {
+	core, observed := observer.New(zap.InfoLevel)
+	router := NewRouter(zap.New(core), chi.NewRouter(), "")
+
+	router.SetStatusWithReason(health.SSStarting, "observability endpoint initialized")
+	router.SetStatusWithReason(health.SSStarting, "duplicate readiness report")
+	router.SetStatusWithReason(health.SSRunning, "all configured ingestion drivers are ready")
+	router.SetStatus(health.SSRunning)
+
+	entries := observed.FilterMessage("Health status changed").All()
+	if len(entries) != 2 {
+		t.Fatalf("health transition log count = %d, want 2", len(entries))
+	}
+	assertTransition(t, entries[0].ContextMap(), "created", "starting", "observability endpoint initialized")
+	assertTransition(t, entries[1].ContextMap(), "starting", "ok", "all configured ingestion drivers are ready")
+}
+
+func TestSetStatusUsesNonEmptyDefaultReason(t *testing.T) {
+	core, observed := observer.New(zap.InfoLevel)
+	router := NewRouter(zap.New(core), chi.NewRouter(), "")
+
+	router.SetStatusWithReason(health.SSTerminating, "  ")
+
+	entries := observed.FilterMessage("Health status changed").All()
+	if len(entries) != 1 {
+		t.Fatalf("health transition log count = %d, want 1", len(entries))
+	}
+	assertTransition(t, entries[0].ContextMap(), "created", "deactivating", "service is shutting down")
+}
+
+func assertTransition(t *testing.T, fields map[string]any, previous, status, reason string) {
+	t.Helper()
+	for key, want := range map[string]string{
+		"previous_status": previous,
+		"status":          status,
+		"reason":          reason,
+	} {
+		if got, ok := fields[key].(string); !ok || got != want {
+			t.Fatalf("%s = %v, want %q", key, fields[key], want)
+		}
+	}
+}