test-lib: use more compact expression in PIPE prerequisite

ramsay-jones · gitster · commit 7b7bea23ac28 · 2017-09-19T12:29:50.000+09:00
Signed-off-by: Ramsay Jones &lt;ramsay@ramsayjones.plus.com&gt;
Reviewed-by: Jonathan Nieder &lt;jrnieder@gmail.com&gt;
Signed-off-by: Junio C Hamano &lt;gitster@pobox.com&gt;
diff --git a/t/test-lib.sh b/t/test-lib.sh
@@ -1062,14 +1062,8 @@ test_i18ngrep () {
 
 test_lazy_prereq PIPE '
 	# test whether the filesystem supports FIFOs
-	case $(uname -s) in
-	CYGWIN*|MINGW*)
-		false
-		;;
-	*)
-		rm -f testfifo && mkfifo testfifo
-		;;
-	esac
+	test_have_prereq !MINGW,!CYGWIN &&
+	rm -f testfifo && mkfifo testfifo
 '
 
 test_lazy_prereq SYMLINKS '
