.

go/internal/xtracing/tracetest/example_test.go

@@ -141,5 +141,22 @@ func Test2ThreadsOK(t *testing.T) {
 // XXX
 func TestDeadlock(t *testing.T) {
 	verify(t, func(t *tracetest.T) {
+		var wg sync.WaitGroup
+		defer wg.Wait()
+		wg.Add(2)
+
+		go func() { // thread1
+			defer wg.Done()
+			hi("T1·A")
+		}()
+
+		go func() { // thread2
+			defer wg.Done()
+			hi("T2·B")
+		}()
+
+		// the checker expects something on stream "t3", but there is
+		// no event sent there -> deadlock.
+		t.Expect("t3", eventHi("zzz"))
 	})
 }