diff --git a/src/testdir/xterm_ramp.vim b/src/testdir/xterm_ramp.vim
new file mode 100644
index 0000000..3c83882
--- /dev/null
+++ b/src/testdir/xterm_ramp.vim
@@ -0,0 +1,40 @@
+" Script to generate a file that shows al 256 xterm colors
+
+new
+call setline(1, 'ANSI')
+
+" ANSI colors
+let s = ''
+for nr in range(0, 7)
+  let s .= "\033[4" . nr . "m    "
+endfor
+for nr in range(8, 15)
+  let s .= "\033[10" . (nr - 8) . "m    "
+endfor
+let s .= "\033[107m|"
+call setline(2, s)
+
+" 6 x 6 x 6 color cube
+call setline(3, 'color cube')
+for high in range(0, 5)
+  let s = ''
+  for low in range(0, 35)
+    let nr = low + high * 36
+    let s .= "\033[48;5;" . (nr + 16) . "m  "
+  endfor
+  let s .= "\033[107m|"
+  call setline(high + 4, s)
+endfor
+
+" 24 shades of grey
+call setline(10, 'grey ramp')
+let s = ''
+for nr in range(0, 23)
+    let s .= "\033[48;5;" . (nr + 232) . "m   "
+endfor
+let s .= "\033[107m|"
+call setline(11, s)
+
+set binary
+write! <sfile>:h/xterm_ramp.txt
+quit