t: factor out FUNNYNAMES as shared lazy prereq

A fair number of tests need to check that the filesystem supports file
names including "funny" characters, like newline, tab, and double-quote.
Jonathan Nieder suggested that this be extracted into a lazy prereq in
the top-level `test-lib.sh`. This patch effects that change.

The FUNNYNAMES prereq now uniformly requires support for newlines, tabs,
and double-quotes in filenames. This very slightly decreases the power
of some tests, which might have run previously on a system that supports
(e.g.) newlines and tabs but not double-quotes, but now will not. This
seems to me like an acceptable tradeoff for consistency.

One test (`t/t9902-completion.sh`) defined FUNNYNAMES to further require
the separators \034 through \037, the test for which was implemented
using the Bash-specific $'\034' syntax. I've elected to leave this one
as is, renaming it to FUNNIERNAMES.

After this patch, `git grep 'test_\(set\|lazy\)_prereq.*FUNNYNAMES'` has
only one result.

Signed-off-by: William Chargin <wchargin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t3600-rm.sh

@@ -14,15 +14,13 @@ test_expect_success \
      git add -- foo bar baz 'space embedded' -q &&
      git commit -m 'add normal files'"
 
-if test_have_prereq !MINGW && touch -- 'tab	embedded' 'newline
-embedded' 2>/dev/null
-then
-	test_set_prereq FUNNYNAMES
-else
+if test_have_prereq !FUNNYNAMES; then
 	say 'Your filesystem does not allow tabs in filenames.'
 fi
 
 test_expect_success FUNNYNAMES 'add files with funny names' "
+     touch -- 'tab	embedded' 'newline
+embedded' &&
      git add -- 'tab	embedded' 'newline
 embedded' &&
      git commit -m 'add files with tabs and newlines'

t/t4135-apply-weird-filenames.sh

@@ -15,15 +15,7 @@ test_expect_success 'setup' '
 		git checkout -f preimage^0 &&
 		git read-tree -u --reset HEAD &&
 		git update-index --refresh
-	} &&
-
-	test_when_finished "rm -f \"tab	embedded.txt\"" &&
-	test_when_finished "rm -f '\''\"quoteembedded\".txt'\''" &&
-	if test_have_prereq !MINGW &&
-		touch -- "tab	embedded.txt" '\''"quoteembedded".txt'\''
-	then
-		test_set_prereq FUNNYNAMES
-	fi
+	}
 '
 
 try_filename() {

t/t9902-completion.sh

@@ -1242,7 +1242,7 @@ test_expect_success 'setup for path completion tests' '
 	   touch BS\\dir/DQ\"file \
 		 '$'separators\034in\035dir/sep\036in\037file''
 	then
-		test_set_prereq FUNNYNAMES
+		test_set_prereq FUNNIERNAMES
 	else
 		rm -rf BS\\dir '$'separators\034in\035dir''
 	fi
@@ -1284,7 +1284,7 @@ test_expect_success '__git_complete_index_file - UTF-8 in ls-files output' '
 	test_path_completion árvíztűrő/С "árvíztűrő/Сайн яваарай"
 '
 
-test_expect_success FUNNYNAMES \
+test_expect_success FUNNIERNAMES \
     '__git_complete_index_file - C-style escapes in ls-files output' '
 	test_path_completion BS \
 			     BS\\dir &&
@@ -1296,7 +1296,7 @@ test_expect_success FUNNYNAMES \
 			     BS\\dir/DQ\"file
 '
 
-test_expect_success FUNNYNAMES \
+test_expect_success FUNNIERNAMES \
     '__git_complete_index_file - \nnn-escaped characters in ls-files output' '
 	test_path_completion sep '$'separators\034in\035dir'' &&
 	test_path_completion '$'separators\034i'' \

t/t9903-bash-prompt.sh

@@ -63,18 +63,15 @@ test_expect_success 'prompt - unborn branch' '
 	test_cmp expected "$actual"
 '
 
-repo_with_newline='repo
-with
-newline'
-
-if test_have_prereq !MINGW && mkdir "$repo_with_newline" 2>/dev/null
-then
-	test_set_prereq FUNNYNAMES
-else
+if test_have_prereq !FUNNYNAMES; then
 	say 'Your filesystem does not allow newlines in filenames.'
 fi
 
 test_expect_success FUNNYNAMES 'prompt - with newline in path' '
+    repo_with_newline="repo
+with
+newline" &&
+	mkdir "$repo_with_newline" &&
 	printf " (master)" >expected &&
 	git init "$repo_with_newline" &&
 	test_when_finished "rm -rf \"$repo_with_newline\"" &&

t/test-lib.sh

@@ -1103,6 +1103,20 @@ test_lazy_prereq CASE_INSENSITIVE_FS '
 	test "$(cat CamelCase)" != good
 '
 
+test_lazy_prereq FUNNYNAMES '
+	test_have_prereq !MINGW &&
+	touch -- \
+		"FUNNYNAMES tab	embedded" \
+		"FUNNYNAMES \"quote embedded\"" \
+		"FUNNYNAMES newline
+embedded" 2>/dev/null &&
+	rm -- \
+		"FUNNYNAMES tab	embedded" \
+		"FUNNYNAMES \"quote embedded\"" \
+		"FUNNYNAMES newline
+embedded" 2>/dev/null
+'
+
 test_lazy_prereq UTF8_NFD_TO_NFC '
 	# check whether FS converts nfd unicode to nfc
 	auml=$(printf "\303\244")