diff --git a/src/testdir/window_manager.vim b/src/testdir/window_manager.vim
new file mode 100644
index 0000000..39e643e
--- /dev/null
+++ b/src/testdir/window_manager.vim
@@ -0,0 +1,110 @@
+source check.vim
+source shared.vim
+
+CheckFeature job
+CheckUnix
+
+let g:xdisplay_num = 100
+
+" Each key is the display name and its value is the compositor/wm job
+let s:wayland_displays = {}
+let s:x11_displays = {}
+
+command -nargs=0 CheckWaylandCompositor call CheckWaylandCompositor()
+command -nargs=0 CheckXServer call CheckXServer()
+
+func CheckWaylandCompositor()
+  CheckFeature wayland
+
+  if executable("labwc") != 1
+    throw "Skipped: labwc is not available"
+  endif
+endfunc
+
+func CheckXServer()
+  CheckFeature x11
+
+  if executable("Xvfb") != 1
+    throw "Skipped: Xvfb is not available"
+  endif
+  if executable("xdpyinfo") != 1
+    throw "Skipped: xdpyinfo is not available"
+  endif
+endfunc
+
+func s:StartCompositorOutput(channel, msg)
+  let l:display = matchstr(a:msg, 'WAYLAND_DISPLAY=\zs.\+')
+
+  if !empty(l:display)
+    let s:wayland_display_name = l:display
+  endif
+endfunc
+
+func s:StartCompositorExit(job, status)
+    if s:wayland_display_name == ""
+      throw "Error: Wayland compositor exited when starting up"
+    endif
+endfunc
+
+func StartWaylandCompositor()
+  let s:wayland_display_name = ""
+
+  let l:wayland_compositor_job = job_start(
+        \ ['labwc', '-c', 'NONE', '-d'], {
+        \ 'err_io': 'pipe',
+        \ 'err_cb': function('s:StartCompositorOutput'),
+        \ 'err_mode': 'nl',
+        \ 'exit_cb': function('s:StartCompositorExit'),
+        \ 'env': { 'WLR_BACKENDS': 'headless' }
+        \ })
+
+  call WaitForAssert({-> assert_equal("run",
+        \ job_status(l:wayland_compositor_job))})
+  call WaitForAssert({-> assert_match('.\+', s:wayland_display_name)})
+
+  let s:wayland_displays[s:wayland_display_name] = l:wayland_compositor_job
+
+  return s:wayland_display_name
+endfunc
+
+func EndWaylandCompositor(display)
+  let l:job = s:wayland_displays[a:display]
+
+  call job_stop(l:job, 'term')
+
+  " Block until compositor is actually gone
+  call WaitForAssert({-> assert_equal("dead", job_status(l:job))})
+
+  unlet s:wayland_displays[a:display]
+endfunc
+
+" Start a separate X11 server instance
+func StartXServer()
+  let l:xdisplay = ':' .. g:xdisplay_num
+
+  let l:x11_server_job = job_start(['Xvfb', l:xdisplay], {})
+
+  call WaitForAssert({-> assert_equal("run", job_status(l:x11_server_job))})
+  " Check if server is ready. Not sure if this is the best way though...
+  call WaitFor({-> system("DISPLAY=" .. l:xdisplay .. " xdpyinfo 2> /dev/null")
+        \ =~? '.\+'})
+
+  g:xdisplay_num += 1
+
+  let s:x11_displays[l:xdisplay] = l:x11_server_job
+
+  return l:xdisplay
+endfunc
+
+func EndXServer(display)
+  let l:job = s:x11_displays[a:display]
+
+  call job_stop(l:job)
+
+  " Block until X server is actually gone
+  call WaitForAssert({-> assert_equal("dead", job_status(l:job))})
+
+  unlet s:x11_displays[a:display]
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab