Add Arabic tests for mark ligature component attachments

diff --git a/test/shaping/texts/in-tree/shaper-arabic/script-arabic/misc/diacritics/MANIFEST b/test/shaping/texts/in-tree/shaper-arabic/script-arabic/misc/diacritics/MANIFEST
index 242b2a1..c71d035 100644
--- a/test/shaping/texts/in-tree/shaper-arabic/script-arabic/misc/diacritics/MANIFEST
+++ b/test/shaping/texts/in-tree/shaper-arabic/script-arabic/misc/diacritics/MANIFEST

@@ -2,5 +2,6 @@
 language-arabic.txt
 language-persian.txt
 language-urdu.txt
+ligature-components.txt
 ligature-diacritics.txt
 mark-skipping.txt

diff --git a/test/shaping/texts/in-tree/shaper-arabic/script-arabic/misc/diacritics/ligature-components.txt b/test/shaping/texts/in-tree/shaper-arabic/script-arabic/misc/diacritics/ligature-components.txt
new file mode 100644
index 0000000..0d4d47f
--- /dev/null
+++ b/test/shaping/texts/in-tree/shaper-arabic/script-arabic/misc/diacritics/ligature-components.txt

@@ -0,0 +1,18 @@
+لّله
+لَّله
+لَّله
+للّه
+للَّه
+للَّه
+للهّ
+للهَّ
+للهَّ
+لّلَه
+لَلّه
+لّلهَ
+لَلهّ
+للّهَ
+للَهّ
+لّلّهَ
+لّلَّه
+لَّلّه