checkapk: dont require abuild.conf if we have default conf

also add tests

checkapk.in

@@ -51,7 +51,7 @@ if [ $# -gt 0 ]; then
 	exit 2
 fi
 
-if ! [ -f "$ABUILD_CONF" ] && ! [ -f "$ABUILD_USERCONF" ]; then
+if ! [ -f "$ABUILD_CONF" ] && ! [ -f "$ABUILD_USERCONF" ] && ! [ -f "$ABUILD_DEFCONF" ]; then
 	die "no abuild.conf found"
 fi
 

tests/checkapk_test

@@ -3,10 +3,16 @@
 . $(atf_get_srcdir)/test_env.sh
 init_tests \
 	checkapk_help \
-	checkapk_invalid_opt
+	checkapk_invalid_opt \
+	checkapk_missing_abuild_conf \
+	checkapk_missing_apkbuild
 
 DATADIR=$(atf_get_srcdir)/testdata
 
+export ABUILD_SHAREDIR=$(atf_get_srcdir)/..
+export ABUILD_CONF=/dev/null
+export ABUILD_USERCONF=/dev/null
+
 checkapk_help_body() {
 	atf_check -s exit:0 \
 		-o match:"Usage:" \
@@ -18,3 +24,17 @@ checkapk_invalid_opt_body() {
 		-e match:"Usage:" \
 		checkapk --invalid
 }
+
+checkapk_missing_abuild_conf_body() {
+	ABUILD_DEFCONF=/dev/null atf_check \
+		-s not-exit:0 \
+		-e match:"no abuild.conf found" \
+		checkapk
+}
+
+checkapk_missing_apkbuild_body() {
+	atf_check \
+		-s not-exit:0 \
+		-e match:"must be run in the directory of a built package" \
+		checkapk
+}