tests: test for the "Binary files A and B differ" diagnostic

* tests/binary: New script.
* tests/Makefile.am (TESTS): Add it.

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/binary b/tests/binary
new file mode 100644
index 0000000..9c31bc6
--- /dev/null
+++ b/tests/binary
@@ -0,0 +1,19 @@
+#!/bin/sh
+# small examples
+
+test "$VERBOSE" = yes && set -x
+: ${srcdir=.}
+. "$srcdir/init.sh"
+
+printf 'Binary files - and /dev/null differ\n' > out-exp || fail_ setup
+
+fail=0
+
+printf '\0'|diff - /dev/null > out 2> err
+
+# diff must exit with status 2, stdout as above, and no stderr.
+test $? = 2 || fail=1
+compare out out-exp || fail=1
+compare err /dev/null || fail=1
+
+Exit $fail