test: improve posix sh compatibility

test/Makefile

@@ -50,9 +50,9 @@ repos.stamp: $(repos)
 		fi; \
 		if ! APK="$(APK)" ROOT="$(testroot)" SYSREPO="$(SYSREPO)" sh -ex ./$< > $(basename $@).out 2>&1; then\
 			echo " FAIL";\
-			printf "------------- output -------------\n" >&2;\
+			printf '%s\n' "------------- output -------------" >&2;\
 			cat $(basename $@).out >&2;\
-			printf "----------------------------------\n" >&2;\
+			printf '%s\n' "----------------------------------" >&2;\
 			exit 1;\
 		fi ;\
 		echo " OK" ;\

test/solver.sh

@@ -10,9 +10,9 @@ TEST_TO_RUN="$@"
 fail=0
 pass=0
 for test in ${TEST_TO_RUN:-*.test}; do
-	get_block ARGS < $test | xargs $APK_TEST &> .$test.got
+	get_block ARGS < $test | xargs $APK_TEST > .$test.got 2>&1
 
-	if ! get_block EXPECT < $test | cmp .$test.got &> /dev/null; then
+	if ! get_block EXPECT < $test | cmp .$test.got > /dev/null 2>&1; then
 		fail=$((fail+1))
 		echo "FAIL: $test"
 		get_block EXPECT < $test | diff -ru - .$test.got

test/version.sh

@@ -9,7 +9,7 @@ cat version.data | while read a result b rest ; do
 	fi
 done
 
-if [ "$fail" == "0" ]; then
+if [ "$fail" = "0" ]; then
 	echo "OK: version checking works"
 fi