From 67c9efac28860e5f0df141816f002deee1a0b7f5 Mon Sep 17 00:00:00 2001
From: Michael Stapelberg <michael@stapelberg.de>
Date: Mon, 5 Nov 2018 23:00:44 +0100
Subject: [PATCH] add sync_test

---
 sync_test.go | 128 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 sync_test.go

diff --git a/sync_test.go b/sync_test.go
new file mode 100644
index 0000000..481c853
--- /dev/null
+++ b/sync_test.go
@@ -0,0 +1,128 @@
+package i3
+
+import (
+	"context"
+	"fmt"
+	"math/rand"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"reflect"
+	"testing"
+
+	"github.com/BurntSushi/xgb/xproto"
+	"github.com/BurntSushi/xgbutil"
+)
+
+// TestSyncSubprocess runs in a process which has been started with
+// DISPLAY= pointing to an Xvfb instance with i3 -c testdata/i3.config running.
+func TestSyncSubprocess(t *testing.T) {
+	if os.Getenv("GO_WANT_XVFB") != "1" {
+		t.Skip("parent process")
+	}
+
+	xu, err := xgbutil.NewConn()
+	if err != nil {
+		t.Fatalf("NewConn: %v", err)
+	}
+	defer xu.Conn().Close()
+
+	// Create an X11 window
+	X := xu.Conn()
+	wid, err := xproto.NewWindowId(X)
+	if err != nil {
+		t.Fatal(err)
+	}
+	screen := xproto.Setup(X).DefaultScreen(X)
+	cookie := xproto.CreateWindowChecked(
+		X,
+		screen.RootDepth,
+		wid,
+		screen.Root,
+		0, // x
+		0, // y
+		1, // width
+		1, // height
+		0, // border width
+		xproto.WindowClassInputOutput,
+		screen.RootVisual,
+		xproto.CwBackPixel|xproto.CwEventMask,
+		[]uint32{ // values must be in the order defined by the protocol
+			0xffffffff,
+			xproto.EventMaskStructureNotify |
+				xproto.EventMaskKeyPress |
+				xproto.EventMaskKeyRelease})
+	if err := cookie.Check(); err != nil {
+		t.Fatal(err)
+	}
+
+	// Synchronize i3 with that X11 window
+	rnd := rand.Uint32()
+	resp, err := Sync(SyncRequest{
+		Rnd:    rnd,
+		Window: uint32(wid),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got, want := resp.Success, true; got != want {
+		t.Fatalf("SyncResult.Success: got %v, want %v", got, want)
+	}
+
+	for {
+		ev, xerr := X.WaitForEvent()
+		if xerr != nil {
+			t.Fatalf("WaitEvent: got X11 error %v", xerr)
+		}
+		cm, ok := ev.(xproto.ClientMessageEvent)
+		if !ok {
+			t.Logf("ignoring non-ClientMessage %v", ev)
+			continue
+		}
+		if got, want := cm.Window, wid; got != want {
+			t.Errorf("sync ClientMessage.Window: got %v, want %v", got, want)
+		}
+		if got, want := cm.Data.Data32[:2], []uint32{uint32(wid), rnd}; !reflect.DeepEqual(got, want) {
+			t.Errorf("sync ClientMessage.Data: got %x, want %x", got, want)
+		}
+		break
+	}
+}
+
+func TestSync(t *testing.T) {
+	t.Parallel()
+
+	ctx, canc := context.WithCancel(context.Background())
+	defer canc()
+
+	_, DISPLAY, err := launchXvfb(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	abs, err := filepath.Abs("testdata/i3.config")
+	if err != nil {
+		t.Fatal(err)
+	}
+	wm := exec.CommandContext(ctx, "i3", "-c", abs, "-d", "all", fmt.Sprintf("--shmlog-size=%d", 5*1024*1024))
+	wm.Env = []string{
+		"DISPLAY=" + DISPLAY,
+		"PATH=" + os.Getenv("PATH"),
+	}
+	wm.Stderr = os.Stderr
+	if err := wm.Start(); err != nil {
+		t.Fatal(err)
+	}
+
+	cmd := exec.Command(os.Args[0], "-test.run=TestSyncSubprocess", "-test.v")
+	cmd.Env = []string{
+		"GO_WANT_XVFB=1",
+		"DISPLAY=" + DISPLAY,
+		"PATH=" + os.Getenv("PATH"),
+	}
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		t.Fatal(err.Error())
+	}
+}