This test ensures that mandatory ligatures in Arabic are displayed. This test uses downloaded WOFF fonts for rendering.
There are two subtests. The first requires an isolate lam-alef ligature and the second requires a right-joining lam-alef ligature.
The first subtest has the word for 'tools', آلات 0622: آ ARABIC LETTER ALEF WITH MADDA ABOVE 0644: ل ARABIC LETTER LAM 0627: ا ARABIC LETTER ALEF 062A: ت ARABIC LETTER TEH
The second subtest has the word for 'three', ثلاثة 062B: ث ARABIC LETTER THEH 0644: ل ARABIC LETTER LAM 0627: ا ARABIC LETTER ALEF 062B: ث ARABIC LETTER THEH 0629: ة ARABIC LETTER TEH MARBUTA
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The test is passed if subtests are displayed as following:
In the first subtest, there must be an isolate lam-alef ligature and in the second subtest there must be a right-joining lam-alef ligature, as in the reference image.