Test case for sync.WaitGroup race

graceful/race_test.go

@@ -0,0 +1,12 @@
+// +build race
+
+package graceful
+
+import "testing"
+
+func TestWaitGroupRace(t *testing.T) {
+	go func() {
+		go WrapConn(fakeConn{}).Close()
+	}()
+	Shutdown()
+}