t7810: avoid unportable use of "echo"

Michael J Gruber noticed that under /bin/dash this test failed
(as is expected -- \n in the string can be interpreted by the
command), while it passed with bash.  We probably could work it
around by using backquote in front of it, but it is safer and
more readable to avoid "echo" altogether in a case like this.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t7810-grep.sh b/t/t7810-grep.sh
index 69bd576..6379ad6 100755 (executable)
--- a/t/t7810-grep.sh
+++ b/t/t7810-grep.sh
@@ -658,9 +658,9 @@ test_expect_success LIBPCRE 'grep -P -v pattern' '
 '
 
 test_expect_success LIBPCRE 'grep -P -i pattern' '
-       {
-               echo "hello.c:  printf(\"Hello world.\n\");"
-       } >expected &&
+       cat >expected <<-EOF &&
+       hello.c:        printf("Hello world.\n");
+       EOF
        git grep -P -i "PRINTF\([^\d]+\)" hello.c >actual &&
        test_cmp expected actual
 '