From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?UTF-8?Q?Torsten_B=c3=b6gershausen?= <tboegi@web.de>
Subject: Re: git diff does not precompose unicode file paths (OS X)
Date: Tue, 15 Mar 2016 06:45:53 +0100
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Cc: Ramsay Jones <ramsay@ramsayjones.plus.com>, git@vger.kernel.org
To: Alexander Rinass <alex@fournova.com>,
	=?UTF-8?Q?Torsten_B=c3=b6gershause?= =?UTF-8?Q?n?= 
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 >I created a test case but git diff exits with 0 if it does not recognize the 
file >path so the test case always succeeds. Can you give me a hint or one 
 >example test case?

The most clean (?) is to compare "git diff" NFC and git diff NFD, they should 
give the same result:
for "git diff" something like this would do:
+
+# This will test git diff
+test_expect_success "git diff f.Adiar" '
+       echo "Modified" >f.$Adiarnfd &&
+       git diff f.$Adiarnfd >expect &&
+       git diff f.$Adiarnfc >actual &&
+       git checkout f.$Adiarnfd &&
+       test_cmp expect actual
+'

HTH
/Torsten