[PATCH v1 3/7] t1010: assert empty output of mktree

[Andrei Rybak <rybak.a.v@gmail.com>]

Builtin "git mktree" writes the the object name of the tree object built
to the standard output.  Tests 'mktree refuses to read ls-tree -r output
(1)' and 'mktree refuses to read ls-tree -r output (2)' in
"t1010-mktree.sh" redirect output of "git mktree" to a file, but don't
use its contents in assertions.

Assert that the output of "git mktree" is empty when it refuses to build
a tree object.

Signed-off-by: Andrei Rybak <rybak.a.v@gmail.com>
---
 t/t1010-mktree.sh | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/t/t1010-mktree.sh b/t/t1010-mktree.sh
index 3c08194526..31ea2ec0bb 100755
--- a/t/t1010-mktree.sh
+++ b/t/t1010-mktree.sh
@@ -60,11 +60,13 @@ test_expect_success 'allow missing object with --missing' '
 '
 
 test_expect_success 'mktree refuses to read ls-tree -r output (1)' '
-	test_must_fail git mktree <all >actual
+	test_must_fail git mktree <all >actual &&
+	test_must_be_empty actual
 '
 
 test_expect_success 'mktree refuses to read ls-tree -r output (2)' '
-	test_must_fail git mktree <all.withsub >actual
+	test_must_fail git mktree <all.withsub >actual &&
+	test_must_be_empty actual
 '
 
 test_done
-- 
2.39.2