Add a few more tests

test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/misc.txt

diff --git a/test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/misc.txt b/test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/misc.txt
index 72126cd..0ab04d6 100644
--- a/test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/misc.txt
+++ b/test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/misc.txt
@@ -22,3 +22,6 @@
 फ़्र
 फ्र
 द्दि
+क्ष
+क्‌ष
+क्‍ष

test/shaping/texts/in-tree/shaper-indic/south-east-asian/script-thai/misc/misc.txt

diff --git a/test/shaping/texts/in-tree/shaper-indic/south-east-asian/script-thai/misc/misc.txt b/test/shaping/texts/in-tree/shaper-indic/south-east-asian/script-thai/misc/misc.txt
index c089cb1..b4f164b 100644
--- a/test/shaping/texts/in-tree/shaper-indic/south-east-asian/script-thai/misc/misc.txt
+++ b/test/shaping/texts/in-tree/shaper-indic/south-east-asian/script-thai/misc/misc.txt
@@ -1,2 +1,11 @@
 ป่ำ
 ป่ำซ้ำพ่อปู่พี่ปี่ฎุฐุญุ
+ก่ํา
+กํ่า
+กุเ
+กะ
+ก่ื
+กื
+กำ
+ก่ำ
+ก่