From 7e9034e80ea8ce4dc8a4635a42894e7294ecc85e Mon Sep 17 00:00:00 2001
From: Jan Sucan <jan@jansucan.com>
Date: Sat, 1 May 2021 10:52:19 +0200
Subject: tests: Add test for invoking with no arguments

---
 Makefile                      | 7 ++++++-
 tests/001-no_options_given.sh | 7 +++++++
 tests/Makefile                | 4 ++++
 3 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 tests/001-no_options_given.sh
 create mode 100644 tests/Makefile

diff --git a/Makefile b/Makefile
index 46a324f..c3ccaeb 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,7 @@
 PROGRAM_NAME=diff-dd
 PROGRAM_VERSION=1.0
+# Program name is used in the tests to locate the executable file
+export PROGRAM_NAME
 
 CC=gcc
 CFLAGS=-Wall
@@ -14,7 +16,10 @@ program_info_header:
 	echo "#define PROGRAM_NAME_STR \"$(PROGRAM_NAME)\"" >program_info.h
 	echo "#define PROGRAM_VERSION_STR \"$(PROGRAM_VERSION)\"" >>program_info.h
 
-.PHONY: clean
+.PHONY: test clean
+
+test: all
+	$(MAKE) -C tests
 
 clean:
 	rm -f *.o *~ $(PROGRAM_NAME) program_info.h
diff --git a/tests/001-no_options_given.sh b/tests/001-no_options_given.sh
new file mode 100644
index 0000000..baa7af1
--- /dev/null
+++ b/tests/001-no_options_given.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+PROGRAM_EXEC="$1"
+
+$PROGRAM_EXEC 1>/dev/null 2>&1
+
+[ $? -ne 0 ] && exit 0 || exit 1
diff --git a/tests/Makefile b/tests/Makefile
new file mode 100644
index 0000000..e202c55
--- /dev/null
+++ b/tests/Makefile
@@ -0,0 +1,4 @@
+PROGRAM_EXEC=../$(PROGRAM_NAME)
+
+all:
+	sh ./001-no_options_given.sh $(PROGRAM_EXEC)
-- 
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