integration: Workaround flaky test around signal

integration-tests/nghttpx_http1_test.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"syscall"
 	"testing"
+	"time"
 )
 
 // TestH1H1PlainGET tests whether simple HTTP/1 GET request works.
@@ -140,6 +141,7 @@ func TestH1H1GracefulShutdown(t *testing.T) {
 	}
 
 	st.cmd.Process.Signal(syscall.SIGQUIT)
+	time.Sleep(150 * time.Millisecond)
 
 	res, err = st.http1(requestParam{
 		name: "TestH1H1GracefulShutdown-2",

integration-tests/nghttpx_http2_test.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 	"syscall"
 	"testing"
+	"time"
 )
 
 // TestH2H1PlainGET tests whether simple HTTP/2 GET request works.
@@ -1175,6 +1176,7 @@ func TestH2H1GracefulShutdown(t *testing.T) {
 
 	// send SIGQUIT signal to nghttpx to perform graceful shutdown
 	st.cmd.Process.Signal(syscall.SIGQUIT)
+	time.Sleep(150 * time.Millisecond)
 
 	// after signal, finish request body
 	if err := st.fr.WriteData(1, true, nil); err != nil {

integration-tests/server_tester.go

@@ -205,6 +205,8 @@ func (st *serverTester) Close() {
 	if st.cmd != nil {
 		st.cmd.Process.Kill()
 		st.cmd.Wait()
+		// workaround to unreliable Process.Signal()
+		time.Sleep(150 * time.Millisecond)
 	}
 	if st.ts != nil {
 		st.ts.Close()