[tests] Add tests for Devanagary Eyelash Ra

Currently broken with Sanskrit 2003 font.
diff --git a/test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/MANIFEST b/test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/MANIFEST
index a68b307..c384b38 100644
--- a/test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/MANIFEST
+++ b/test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/MANIFEST
@@ -1,4 +1,5 @@
 dottedcircle.txt
+eyelash.txt
 joiners.txt
 misc.txt
 spec-deviations.txt
diff --git a/test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/eyelash.txt b/test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/eyelash.txt
new file mode 100644
index 0000000..8e11955
--- /dev/null
+++ b/test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/eyelash.txt
@@ -0,0 +1,3 @@
+त्र्क
+त्र्‍क
+त्र्‌क