hexdump: fix short file of zero butes treated as dup

function                                             old     new   delta
bb_dump_dump                                        1466    1491     +25

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/testsuite/hexdump.tests b/testsuite/hexdump.tests
new file mode 100755
index 000000000..45a0c1300
--- /dev/null
+++ b/testsuite/hexdump.tests
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+# Copyright 2018 by Denys Vlasenko <vda.linux@googlemail.com>
+# Licensed under GPLv2, see file LICENSE in this source tree.
+
+. ./testing.sh
+
+# testing "description" "command" "result" "infile" "stdin"
+testing 'hexdump -C with four NULs' \
+	'hexdump -C' \
+	"\
+00000000  00 00 00 00                                       |....|
+00000004
+" \
+	'' \
+	'\0\0\0\0'
+
+exit $FAILCOUNT