added a simple, totally incomplete test suite

Makefile

@@ -9,6 +9,9 @@ LDFLAGS += $(shell pkg-config --libs libsystemd)
 
 all: hddemux hddemux.1
 
+check: hddemux
+	./testsuite
+
 hddemux: hddemux.c
 	gcc $(CFLAGS) $(LDFLAGS) -std=c11 -pedantic -Wall -Werror -o $@ $<
 
@@ -31,4 +34,4 @@ clean:
 	draft-dkg-dprive-demux-dns-http.html \
 	draft-dkg-dprive-demux-dns-http.xml
 
-.PHONY: clean all
+.PHONY: clean all check

testsuite

 #!/bin/bash
 
+set -e
+
 # test suite for hddemux
 
 # this is just a stub.
 
+[ -x ./hddemux ]
+
 # hddemux with no arguments and no listening file descriptors should fail:
-if [ ./hddemux ]; then
+if ./hddemux; then
     false
 fi