test: add test_write_lines helper

API and implementation as suggested by Junio.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/README

@@ -596,6 +596,28 @@ library for your script to use.
 		...
 	'
 
+ - test_write_lines <text>
+
+   Split <text> to white-space separated words and write it out on standard
+   output, one word per line.
+   Useful to prepare multi-line files in a compact form.
+
+   Example:
+
+	test_write_lines "a b c d e f g" >foo
+
+   Is a more compact equivalent of:
+	cat >foo <<-EOF
+	a
+	b
+	c
+	d
+	e
+	f
+	g
+	EOF
+
+
  - test_pause
 
 	This command is useful for writing and debugging tests and must be

t/test-lib-functions.sh

@@ -712,6 +712,11 @@ test_ln_s_add () {
 	fi
 }
 
+# This function writes out its parameters, one per line
+test_write_lines () {
+	printf "%s\n" "$@"
+}
+
 perl () {
 	command "$PERL_PATH" "$@"
 }