Create unit test for gateway functions

This patch add some unit test. It uses CMOCKA library that is
unit test framework for C language.  In addtion, this patch
add some shell scripts that enables interface creation and
clean up, clean up in case of test is failed, and create
coveradge report.

Author: NaotoYamaguchi-A

GNUmakefile.am

@@ -3,6 +3,10 @@ SUBDIRS = \
 	config \
 	src
 
+if ENABLE_TEST
+SUBDIRS += test
+endif
+
 EXTRA_DIST = \
 	autogen.sh \
 	config/m4/.secret-world-domination-project

configure.ac

@@ -95,7 +95,7 @@ if test "${CONFIG_DEBUG}" = "yes"; then
     CFLAGS="${CFLAGS} -Werror -Wsign-compare -Wfloat-equal -Wformat-security -g -O1"
     AC_DEFINE(DEBUG, 1, [debugging])
 else
-    CFLAGS="${CFLAGS} -O2"
+    CFLAGS="${CFLAGS} -g -O2"
 fi
 
 
@@ -141,12 +141,25 @@ if test "$enable_address_sanitizer" = "yes"; then
     CFLAGS="${CFLAGS} -fsanitize=address"
 fi
 
+#
+# Enable unit test
+#
+AC_ARG_ENABLE([test],
+  [AS_HELP_STRING([--enable-test], [Enable unit test build (cmocka is required, default is no])],
+  [:],
+  [enable_test=no])
+AM_CONDITIONAL([ENABLE_TEST], [test "$enable_test" = "yes"])
+AS_CASE(
+  ["$enable_test"],
+  [yes], [PKG_CHECK_MODULES([CMOCKA], [cmocka])],[])
+
 AC_CONFIG_FILES([
 	GNUmakefile
 	config/libsocketcan.pc
 	config/GNUmakefile
 	include/GNUmakefile
 	src/GNUmakefile
+	test/GNUmakefile
 	])
 AC_OUTPUT
 

src/GNUmakefile.am

@@ -19,8 +19,4 @@ libsocketcan_la_LDFLAGS = \
 MAINTAINERCLEANFILES = \
 	GNUmakefile.in
 
-bin_PROGRAMS = gwtwst
-
-gwtwst_SOURCES = test/gwtest.c
-
 CLEANFILES = *.gcda *.gcno

src/libcangw.c

@@ -520,7 +520,7 @@ int cangw_get_rules(socketcan_gw_rules_t **gw_rules)
 		if (parse_listing_data(pgw_rules, rxbuf, ret))
 			break;
 	}
-	print_gw_rules(pgw_rules);
+
 	(*gw_rules) = pgw_rules;
 
 do_return:

src/test/gwtest.c

@@ -0,0 +1,15 @@
+bin_PROGRAMS = gwtest
+
+gwtest_SOURCES = gwtest.c
+
+gwtest_LDADD = \
+	@CMOCKA_LIBS@
+
+gwtest_CFLAGS = \
+	-g \
+	-I$(top_srcdir)/src \
+	-I$(top_srcdir)/include \
+	@CMOCKA_CFLAGS@ \
+	-D_GNU_SOURCE
+
+CLEANFILES = *.gcda *.gcno

test/GNUmakefile.am

@@ -0,0 +1,5 @@
+#!/bin/sh
+ip link del vxcan0
+ip link del vcan0
+ip link del vcan1
+

test/clean-test.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+rm -Rf ./coverage
+mkdir -p ./coverage
+mkdir -p ./coverage/report
+
+lcov -c --rc lcov_branch_coverage=1 -d . -o ./coverage/testcoverage.info
+genhtml --rc lcov_branch_coverage=1 -o ./coverage/report -f ./coverage/testcoverage.info --num-spaces 4
+