Currently, "git grep" does not invoke any textconv filters. Demonstrate
this in the tests.

Signed-off-by: Michael J Gruber <g...@drmicha.warpmail.net>
---
 t/t7008-grep-binary.sh | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/t/t7008-grep-binary.sh b/t/t7008-grep-binary.sh
index 26f8319..a1fd0b2 100755
--- a/t/t7008-grep-binary.sh
+++ b/t/t7008-grep-binary.sh
@@ -145,4 +145,23 @@ test_expect_success 'grep respects not-binary diff 
attribute' '
        test_cmp expect actual
 '
 
+cat >nul_to_q_textconv <<'EOF'
+#!/bin/sh
+"$PERL_PATH" -pe 'y/\000/Q/' < "$1"
+EOF
+chmod +x nul_to_q_textconv
+
+test_expect_success 'setup textconv filters' '
+       echo a diff=foo >.gitattributes &&
+       git config diff.foo.textconv "\"$(pwd)\""/nul_to_q_textconv
+'
+
+test_expect_success 'grep does not obey textconv' '
+       test_must_fail git grep Qfile
+'
+
+test_expect_success 'grep blob does not obey textconv' '
+       test_must_fail git grep Qfile HEAD:a
+'
+
 test_done
-- 
1.8.2.1.728.ge98e8b0

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