t9350: fix encoding test to actually test reencoding

This test used an author with non-ascii characters in the name, but
no special commit message.  It then grep'ed for those non-ascii
characters, but those are guaranteed to exist regardless of the
reencoding process since the reencoding only affects the commit message,
not the author or committer names.  As such, the test would work even if
the re-encoding process simply stripped the commit message entirely.
Modify the test to actually check that the reencoding in utf-8 worked.

Signed-off-by: Elijah Newren <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: newren

t/t9350-fast-export.sh

@@ -94,22 +94,21 @@ test_expect_success 'fast-export --show-original-ids | git fast-import' '
 	test $MUSS = $(git rev-parse --verify refs/tags/muss)
 '
 
-test_expect_success 'iso-8859-1' '
+test_expect_success 'iso-8859-7' '
 
-	git config i18n.commitencoding ISO8859-1 &&
-	# use author and committer name in ISO-8859-1 to match it.
-	. "$TEST_DIRECTORY"/t3901/8859-1.txt &&
+	test_when_finished "git reset --hard HEAD~1" &&
+	test_config i18n.commitencoding iso-8859-7 &&
 	test_tick &&
 	echo rosten >file &&
-	git commit -s -m den file &&
-	git fast-export wer^..wer >iso8859-1.fi &&
-	sed "s/wer/i18n/" iso8859-1.fi |
+	git commit -s -m "$(printf "Pi: \360")" file &&
+	git fast-export wer^..wer >iso-8859-7.fi &&
+	sed "s/wer/i18n/" iso-8859-7.fi |
 		(cd new &&
 		 git fast-import &&
 		 git cat-file commit i18n >actual &&
-		 grep "Áéí óú" actual)
-
+		 grep $(printf "\317\200") actual)
 '
+
 test_expect_success 'import/export-marks' '
 
 	git checkout -b marks master &&
@@ -224,7 +223,6 @@ GIT_COMMITTER_NAME='C O Mitter'; export GIT_COMMITTER_NAME
 
 test_expect_success 'setup copies' '
 
-	git config --unset i18n.commitencoding &&
 	git checkout -b copy rein &&
 	git mv file file3 &&
 	git commit -m move1 &&