test: cover multi-subscriber fanout for process ws

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

internal/api/process_ws_test.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"sync"
 	"testing"
 	"time"
 
@@ -88,3 +89,114 @@ func TestProcessWS(t *testing.T) {
 		t.Fatal("did not receive exit banner frame")
 	}
 }
+
+func TestProcessWSMultiSubscriber(t *testing.T) {
+	tmpDir := t.TempDir()
+
+	opencodePath := filepath.Join(tmpDir, "opencode")
+	script := []byte("#!/bin/sh\nread line\nfor i in 1 2 3; do\n  echo \"got: $line ($i)\"\n  sleep 0.05\ndone\nexit 0\n")
+	if err := os.WriteFile(opencodePath, script, 0o755); err != nil {
+		t.Fatalf("write fake opencode: %v", err)
+	}
+
+	wsRoot := filepath.Join(tmpDir, "workspaces")
+	wsMgr := workspace.NewLocalManager(wsRoot)
+	procMgr := process.NewManager(opencodePath)
+	wsSvc := service.NewWorkspaceService(wsMgr, procMgr, nil)
+	fileSvc := service.NewFileService(wsMgr, 1<<20)
+	procSvc := service.NewProcessService(wsMgr, procMgr, nil)
+
+	r := NewRouter(wsSvc, fileSvc, procSvc, nil, gin.TestMode)
+	srv := httptest.NewServer(r)
+	defer srv.Close()
+
+	ws, err := wsSvc.Create("wsmulti")
+	if err != nil {
+		t.Fatalf("create workspace: %v", err)
+	}
+	t.Cleanup(func() {
+		if err := wsSvc.Delete(ws.ID); err != nil {
+			t.Logf("cleanup delete workspace: %v", err)
+		}
+	})
+
+	if err := procSvc.Start(ws.ID); err != nil {
+		t.Fatalf("start process: %v", err)
+	}
+
+	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http") + "/api/workspaces/" + ws.ID + "/process/ws"
+
+	ready := make(chan struct{}, 3)
+	start := make(chan struct{})
+	frames := make([][]string, 3)
+	errs := make([]error, 3)
+
+	var wg sync.WaitGroup
+	for i := 0; i < 3; i++ {
+		wg.Add(1)
+		go func(idx int) {
+			defer wg.Done()
+
+			conn, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
+			if err != nil {
+				errs[idx] = err
+				return
+			}
+			defer conn.Close()
+
+			ready <- struct{}{}
+			<-start
+
+			if err := conn.WriteMessage(websocket.TextMessage, []byte("hello\n")); err != nil {
+				errs[idx] = err
+				return
+			}
+			if err := conn.SetReadDeadline(time.Now().Add(5 * time.Second)); err != nil {
+				errs[idx] = err
+				return
+			}
+
+			for {
+				_, data, err := conn.ReadMessage()
+				if err != nil {
+					errs[idx] = err
+					break
+				}
+				text := string(data)
+				frames[idx] = append(frames[idx], text)
+				if strings.Contains(text, "[process exited") {
+					break
+				}
+			}
+		}(i)
+	}
+
+	for i := 0; i < 3; i++ {
+		<-ready
+	}
+	close(start)
+	wg.Wait()
+
+	for i, ff := range frames {
+		var got1, got2, got3, gotExit bool
+		var got strings.Builder
+		for _, f := range ff {
+			got.WriteString(f)
+			if strings.Contains(f, "got: hello (1)") {
+				got1 = true
+			}
+			if strings.Contains(f, "got: hello (2)") {
+				got2 = true
+			}
+			if strings.Contains(f, "got: hello (3)") {
+				got3 = true
+			}
+			if strings.Contains(f, "[process exited") {
+				gotExit = true
+			}
+		}
+		if !got1 || !got2 || !got3 || !gotExit || errs[i] != nil {
+			t.Fatalf("subscriber #%d failed: err=%v, frames=%q", i+1, errs[i], got.String())
+		}
+	}
+}