hack/make: fix test-unit target to propogate TESTFLAGS properly

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Upstream-commit: 9a2d4e92730a576a05e40f7575a6c90512896e87
Component: engine

components/engine/hack/make/test-unit

@@ -56,7 +56,7 @@ go_run_test_dir() {
 		echo
 		echo '+ go test' $TESTFLAGS "${DOCKER_PKG}${dir#.}"
 		precompiled="$DEST/precompiled/$dir.test"
-		if ! ( cd "$dir" && "$precompiled" ); then
+		if ! ( cd "$dir" && "$precompiled" $TESTFLAGS ); then
 			TESTS_FAILED+=("$dir")
 			echo
 			echo "${RED}Tests failed: $dir${TEXTRESET}"