grep -P: add tests for matching ^ and $

Earlier, fba4f1 (grep -P: Fix matching ^ and $) fixed an ancient bug.  Add
some tests to protect the change from future breakages; a slightly broken
version of this was a part of the originally submitted patch.

Signed-off-by: Michał Kiedrowicz <michal.kiedrowicz@gmail.com>
Signed-off-by: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t7810-grep.sh b/t/t7810-grep.sh
index 75f4716..d9ad633 100755 (executable)
--- a/t/t7810-grep.sh
+++ b/t/t7810-grep.sh
@@ -47,6 +47,13 @@ test_expect_success setup '
        echo vvv >t/v &&
        mkdir t/a &&
        echo vvv >t/a/v &&
+       {
+               echo "line without leading space1"
+               echo " line with leading space1"
+               echo " line with leading space2"
+               echo " line with leading space3"
+               echo "line without leading space2"
+       } >space &&
        git add . &&
        test_tick &&
        git commit -m initial
@@ -893,4 +900,20 @@ test_expect_success 'mimic ack-grep --group' '
        test_cmp expected actual
 '
 
+cat >expected <<EOF
+space: line with leading space1
+space: line with leading space2
+space: line with leading space3
+EOF
+
+test_expect_success LIBPCRE 'grep -E "^ "' '
+       git grep -E "^ " space >actual &&
+       test_cmp expected actual
+'
+
+test_expect_success LIBPCRE 'grep -P "^ "' '
+       git grep -P "^ " space >actual &&
+       test_cmp expected actual
+'
+
 test_done