tests: test xterm OSC 10/11 to change/get {fore,back}ground colors

tests/tests.results

@@ -143,3 +143,5 @@ color_link_edc.sh a6e4b47eb65c04da568b9662fd80b7e0
 color_link_css_rgb.sh c1f5a5b4f3d87b710aed59f72439a645
 color_link_css_hsl.sh fc9bda72bd4eea5e9414ef9755ae176a
 crash_empty_osc.sh b87272896ce7be9856253b32be1bef14
+xterm-osc-10.sh b8c23c9c5482b1e9c30d8a261edc29f0
+xterm-osc-11.sh 3e02038964b78d948fb599c996bf370d

tests/xterm-osc-10.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+# char width: 7
+# char height: 15
+
+# set color
+printf '\033[0;46;3m'
+
+# clear screen
+printf '\033[2J'
+
+# move to 0; 0
+printf '\033[0;0H'
+
+printf 'The purpose of computing is insight, not numbers.\r\n'
+printf 'Richard Hamming\r\n'
+
+# invalid colors
+printf '\033]10;#ff0\007'
+printf '\033]10;#FfFfFfFf\007'
+printf '\033]10;fff000\007'
+# change foreground color and then query it
+printf '\033]10;#ff00FF\007'
+printf '\033]10;?\007'
+sleep 0.1

tests/xterm-osc-11.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+# char width: 7
+# char height: 15
+
+# set color
+printf '\033[0;31;3m'
+
+# clear screen
+printf '\033[2J'
+
+# move to 0; 0
+printf '\033[0;0H'
+
+printf 'The purpose of computing is insight, not numbers.\r\n'
+printf 'Richard Hamming\r\n'
+
+# invalid colors
+printf '\033]11;#ff0\007'
+printf '\033]11;#FfFfFfFf\007'
+printf '\033]11;fff000\007'
+# change background color and then query it
+printf '\033]11;#ff00FF\007'
+printf '\033]11;?\007'
+sleep 0.1