feat: simplify Claw402 autopilot trading flow

mcp/payment/x402_test.go

@@ -0,0 +1,52 @@
+package payment
+
+import (
+	"context"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"sync/atomic"
+	"testing"
+
+	"nofx/mcp"
+)
+
+func TestDoX402RequestStreamRetriesInitialServerError(t *testing.T) {
+	var calls int32
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		call := atomic.AddInt32(&calls, 1)
+		if call == 1 {
+			http.Error(w, "temporary upstream failure", http.StatusInternalServerError)
+			return
+		}
+		w.Header().Set("Content-Type", "text/event-stream")
+		_, _ = w.Write([]byte("data: ok\n\n"))
+	}))
+	defer server.Close()
+
+	resp, err := DoX402RequestStream(
+		context.Background(),
+		server.Client(),
+		func() (*http.Request, error) {
+			return http.NewRequest(http.MethodPost, server.URL, nil)
+		},
+		func(string) (string, error) { return "unused", nil },
+		"test-claw402",
+		mcp.NewNoopLogger(),
+	)
+	if err != nil {
+		t.Fatalf("DoX402RequestStream returned error: %v", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		t.Fatalf("ReadAll returned error: %v", err)
+	}
+	if got := string(body); got != "data: ok\n\n" {
+		t.Fatalf("body = %q, want SSE body", got)
+	}
+	if got := atomic.LoadInt32(&calls); got != 2 {
+		t.Fatalf("calls = %d, want 2", got)
+	}
+}