for-each-ref: explicitly test no matches

The for-each-ref builtin can take a list of ref patterns, but if none
match, it still succeeds (but with no output). Add an explicit test that
demonstrates that behavior.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index a58053a54c5c37a7cd32a6d855c9512098a96027..6614469d2d63eff2a2cc474d5bc311c64104eeda 100755 (executable)
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -1501,4 +1501,17 @@ test_expect_success 'git for-each-ref --stdin: matches' '
        test_cmp expect actual
 '
 
+test_expect_success 'git for-each-ref with non-existing refs' '
+       cat >in <<-EOF &&
+       refs/heads/this-ref-does-not-exist
+       refs/tags/bogus
+       EOF
+
+       git for-each-ref --format="%(refname)" --stdin <in >actual &&
+       test_must_be_empty actual &&
+
+       xargs git for-each-ref --format="%(refname)" <in >actual &&
+       test_must_be_empty actual
+'
+
 test_done