This test ensures that mandatory ligatures in Arabic are displayed. This test uses WOFF fonts for rendering, with platform fonts for fallback.
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, (so that them, lam and alef are all connected), as in the reference image.
The precise glyph shapes will depend on which font was used for rendering, and do not affect the pass criteria. Only the presence of the mandatory ligatures is tested here.