tests: add a test program for lib/command.c

Signed-off-by: Christian Franke <chris@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/tests/libzebra.tests/Makefile.am b/tests/libzebra.tests/Makefile.am
index 14138a0..a1ffea3 100644
--- a/tests/libzebra.tests/Makefile.am
+++ b/tests/libzebra.tests/Makefile.am
@@ -1,3 +1,4 @@
 EXTRA_DIST = \
 	tabletest.exp \
+	testcommands.exp \
 	testnexthopiter.exp