chore: import upstream snapshot with attribution

gateway/a2a/client_test.go

@@ -0,0 +1,168 @@
+package a2a
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+)
+
+// An agent that embeds NewAgentHandler is directly A2A-queryable — no
+// gateway, no registry — and the client talks to it the same way.
+func TestEmbeddedAgentHandler(t *testing.T) {
+	card := Card("solo", "http://localhost:4000", "", []string{"task"})
+	h := NewAgentHandler(card, func(_ context.Context, text string) (string, error) {
+		return "echo:" + text, nil
+	})
+	ts := httptest.NewServer(h)
+	defer ts.Close()
+
+	cl := NewClient(ts.URL)
+	got, err := cl.Card(context.Background())
+	if err != nil || got.Name != "solo" {
+		t.Fatalf("Card() = %+v, err %v", got, err)
+	}
+	reply, err := cl.Send(context.Background(), "hi")
+	if err != nil || reply != "echo:hi" {
+		t.Fatalf("Send = %q, err %v", reply, err)
+	}
+}
+
+// The client fetches a card and sends a message to an agent served by the
+// gateway — A2A end to end, both directions, in one process.
+func TestClientSendAndCard(t *testing.T) {
+	ts, cleanup := newGatewayWithAgent(t)
+	defer cleanup()
+
+	cl := NewClient(ts.URL + "/agents/echo")
+
+	card, err := cl.Card(context.Background())
+	if err != nil || card.Name != "echo" {
+		t.Fatalf("Card() = %+v, err %v", card, err)
+	}
+
+	reply, err := cl.Send(context.Background(), "ping")
+	if err != nil {
+		t.Fatalf("Send: %v", err)
+	}
+	if reply != "pong" {
+		t.Errorf("Send reply = %q, want pong", reply)
+	}
+}
+
+func TestClientContinuesTaskAndConfiguresPush(t *testing.T) {
+	card := Card("solo", "http://localhost:4000", "", []string{"task"})
+	h := NewAgentHandler(card, func(_ context.Context, text string) (string, error) {
+		return "echo:" + text, nil
+	})
+	ts := httptest.NewServer(h)
+	defer ts.Close()
+
+	updates := make(chan Task, 1)
+	push := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var task Task
+		if err := json.NewDecoder(r.Body).Decode(&task); err != nil {
+			t.Errorf("decode push task: %v", err)
+			return
+		}
+		updates <- task
+		w.WriteHeader(http.StatusAccepted)
+	}))
+	defer push.Close()
+
+	cl := NewClient(ts.URL)
+	first, err := cl.SendMessage(context.Background(), Message{
+		Parts: []Part{{Kind: "text", Text: "one"}},
+	})
+	if err != nil {
+		t.Fatalf("first SendMessage: %v", err)
+	}
+	second, err := cl.SendMessage(context.Background(), Message{
+		TaskID:    first.ID,
+		ContextID: first.ContextID,
+		Parts:     []Part{{Kind: "text", Text: "two"}},
+	})
+	if err != nil {
+		t.Fatalf("second SendMessage: %v", err)
+	}
+	if second.ID != first.ID || second.ContextID != first.ContextID || len(second.History) != 4 {
+		t.Fatalf("continued task = %+v, first %+v", second, first)
+	}
+	cfg := PushNotificationConfig{URL: push.URL}
+	if err := cl.SetPushNotificationConfig(context.Background(), second.ID, cfg); err != nil {
+		t.Fatalf("SetPushNotificationConfig: %v", err)
+	}
+	got, err := cl.PushNotificationConfig(context.Background(), second.ID)
+	if err != nil {
+		t.Fatalf("PushNotificationConfig: %v", err)
+	}
+	if got.URL != push.URL {
+		t.Fatalf("PushNotificationConfig URL = %q, want %q", got.URL, push.URL)
+	}
+	select {
+	case update := <-updates:
+		if update.ID != second.ID {
+			t.Fatalf("push update ID = %q, want %q", update.ID, second.ID)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("timed out waiting for push update")
+	}
+}
+
+func TestClientResubscribeStreamsRetainedAndLiveTask(t *testing.T) {
+	d := newDispatcher()
+	initial := &Task{ID: "task-1", ContextID: "ctx-1", Kind: "task", Status: TaskStatus{State: stateWorking, Timestamp: time.Now().UTC().Format(time.RFC3339)}}
+	d.store(initial)
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		d.serve(w, r, func(context.Context, string) (string, error) { return "", nil })
+	}))
+	defer ts.Close()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+	tasks, errs := NewClient(ts.URL).Resubscribe(ctx, initial.ID)
+
+	first := <-tasks
+	if first.ID != initial.ID || first.Status.State != stateWorking {
+		t.Fatalf("first resubscribe task = %+v, want retained working task", first)
+	}
+	final := &Task{ID: initial.ID, ContextID: initial.ContextID, Kind: "task", Status: TaskStatus{State: stateCompleted, Timestamp: time.Now().UTC().Format(time.RFC3339)}, Artifacts: []Artifact{textArtifact("done")}}
+	d.store(final)
+	second := <-tasks
+	if second.ID != final.ID || second.Status.State != stateCompleted || textOf(second.Artifacts[0].Parts) != "done" {
+		t.Fatalf("second resubscribe task = %+v, want live completed task", second)
+	}
+	if _, ok := <-tasks; ok {
+		t.Fatal("resubscribe task channel stayed open after terminal update")
+	}
+	select {
+	case err := <-errs:
+		if err != nil {
+			t.Fatalf("resubscribe error = %v", err)
+		}
+	default:
+	}
+}
+
+func TestClientSendMessageReturnsInputRequiredTask(t *testing.T) {
+	card := Card("solo", "http://localhost:4000", "", []string{"task"})
+	h := NewAgentHandler(card, func(context.Context, string) (string, error) {
+		return "", errors.New("input-required: provide approval code")
+	})
+	ts := httptest.NewServer(h)
+	defer ts.Close()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+	task, err := NewClient(ts.URL).SendMessage(ctx, Message{Parts: []Part{{Kind: "text", Text: "approve?"}}})
+	if err != nil {
+		t.Fatalf("SendMessage: %v", err)
+	}
+	if task.Status.State != stateInputRequired || !strings.Contains(textOf(task.Artifacts[0].Parts), "provide approval code") {
+		t.Fatalf("task = %+v, want input-required handoff", task)
+	}
+}