lib/common.mk: Support supplying test names on the command line

Support passing test names to 'make test' invocations as TESTS=names...
This makes it easier to debug particular tests that are failing.

Signed-off-by: Toke Høiland-Jørgensen <[email protected]>

Author: tohojo

lib/common.mk

@@ -139,5 +139,5 @@ test:
 	@echo "    No tests defined"
 else
 test: all
-	$(Q)$(TEST_DIR)/test_runner.sh $(TEST_FILE)
+	$(Q)$(TEST_DIR)/test_runner.sh $(TEST_FILE) $(TESTS)
 endif