Initialize LineUp app server

internal/wkapi/wkapi_test.go

@@ -0,0 +1,69 @@
+package wkapi
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"sync/atomic"
+	"testing"
+)
+
+func TestSendMessageRetriesRetryRequiredWithSameClientMessageNumber(t *testing.T) {
+	var attempts atomic.Int32
+	var clientMsgNo string
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/message/send" {
+			t.Fatalf("path = %s, want /message/send", r.URL.Path)
+		}
+		var got SendMessageRequest
+		if err := json.NewDecoder(r.Body).Decode(&got); err != nil {
+			t.Fatalf("decode request: %v", err)
+		}
+		if clientMsgNo == "" {
+			clientMsgNo = got.ClientMsgNo
+		} else if got.ClientMsgNo != clientMsgNo {
+			t.Fatalf("client_msg_no = %q, want stable %q", got.ClientMsgNo, clientMsgNo)
+		}
+		if attempts.Add(1) <= 2 {
+			w.WriteHeader(http.StatusServiceUnavailable)
+			_, _ = w.Write([]byte(`{"error":"retry required"}`))
+			return
+		}
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"message_id":101,"message_seq":7,"reason":1}`))
+	}))
+	defer server.Close()
+
+	client := New(server.URL)
+	response, err := client.SendMessage(SendMessageRequest{
+		FromUID: "user_1", ChannelID: "agent_channel", ChannelType: 2,
+		ClientMsgNo: "lineup-idempotent-message", Payload: "aGVsbG8=",
+	})
+	if err != nil {
+		t.Fatalf("SendMessage() error = %v", err)
+	}
+	if response.MessageID != 101 || response.MessageSeq != 7 {
+		t.Fatalf("SendMessage() response = %#v", response)
+	}
+	if got := attempts.Load(); got != 3 {
+		t.Fatalf("attempts = %d, want 3", got)
+	}
+}
+
+func TestSendMessageDoesNotRetryPermanentAPIError(t *testing.T) {
+	var attempts atomic.Int32
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		attempts.Add(1)
+		w.WriteHeader(http.StatusBadRequest)
+		_, _ = w.Write([]byte(`{"error":"invalid request"}`))
+	}))
+	defer server.Close()
+
+	_, err := New(server.URL).SendMessage(SendMessageRequest{ClientMsgNo: "invalid"})
+	if err == nil {
+		t.Fatal("SendMessage() error = nil, want permanent error")
+	}
+	if got := attempts.Load(); got != 1 {
+		t.Fatalf("attempts = %d, want 1", got)
+	}
+}