diff --git a/tests/centerpixel.c b/tests/centerpixel.c
new file mode 100644
index 0000000..f8162ff
--- /dev/null
+++ b/tests/centerpixel.c
@@ -0,0 +1,62 @@
+
+
+#include <X11/Xlib.h>
+#include <X11/X.h>
+#include "helper.h"
+
+
+
+
+
+
+
+int
+jnzjmp(void)
+{
+    __test__start_basic();
+
+
+    XEvent ev;
+    GC gc = XCreateGC(dpy, win, 0, NULL);
+    int x = 0;
+    int y = 0;
+    int w = 0;
+    int h = 0;
+    XSelectInput(dpy, win, StructureNotifyMask|SubstructureNotifyMask|ExposureMask);
+    XSetForeground(dpy, gc, 0);
+    XSync(dpy, screen);
+    while(!XNextEvent(dpy, &ev))
+    {
+        unsigned int sqw;
+        unsigned int sqh;
+        int sqx;
+        int sqy;
+        switch(ev.type)
+        {
+            case ConfigureNotify:
+                x = ev.xconfigure.x;
+                y = ev.xconfigure.y;
+                w = ev.xconfigure.width;
+                h = ev.xconfigure.height;
+            case Expose:
+                XFillRectangle(dpy, win, gc, 0, 0, w, h);
+                XSetForeground(dpy, gc, ~0);
+                sqw = sw / 10;
+                sqh = sw / 10;
+                //unsigned int sqx = w / 2 - sqw / 2;
+                //unsigned int sqy = h / 2 - sqh / 2;
+                //sqx = (((sw / 2) - sqw) - x) + sqw / 2;
+                //sqy = (((sh / 2) - sqh) - y) + sqh / 2;
+                sqx = ((sw / 2)) - sqw / 2 - x;
+                sqy = ((sh / 2)) - sqh / 2 - y;
+                XFillArc(dpy, win, gc, sqx, sqy, sqw, sqh, 1 * 64, 360 * 64);
+                //XFillRectangle(dpy, win, gc, sqx, sqy, sqw, sqh);
+                XSetForeground(dpy, gc, 0);
+                break;
+        }
+    }
+
+
+
+    return 0;
+}
diff --git a/tests/helper.h b/tests/helper.h
new file mode 100644
index 0000000..7038df5
--- /dev/null
+++ b/tests/helper.h
@@ -0,0 +1,42 @@
+#include <X11/Xatom.h>
+#include <X11/X.h>
+#include <X11/Xlib.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+Display *dpy;
+int screen;
+int sw;
+int sh;
+Window win;
+Window root;
+
+static void
+__test__start_basic(void)
+{
+    dpy = XOpenDisplay(NULL);
+    if(!dpy)
+    {   
+        printf("Could not load display\n");
+        exit(1);
+    }
+    screen = DefaultScreen(dpy);
+    sw = DisplayWidth(dpy, screen);
+    sh = DisplayHeight(dpy, screen);
+    
+
+    root = DefaultRootWindow(dpy);
+
+    XSetWindowAttributes wa =
+    {
+        .bit_gravity = NorthWestGravity,
+            ///NorthWestGravity,
+        .backing_store = WhenMapped,
+    };
+    unsigned int mask = CWBitGravity|CWBackingStore;
+    win = XCreateWindow(dpy, root, 0, 0, sw, sh, 0, DefaultDepth(dpy, screen), InputOutput, 0, mask, &wa);
+    XMapWindow(dpy, win);
+}