Add a new makefile rule to check for test errors.

This rule will test each program, ignore all output, and return pass or
fail depending on whether the test has errors. This is the equivalent of
"make build-check", but for tests.

Makefile

@@ -386,4 +386,15 @@ build-check:
 		fi; \
 	done
 
+# This rule will test each program, ignore all output, and return pass
+# or fail depending on whether the test has errors.
+test-check:
+	@for prog in $(sort $(TEST_PROGS)); do \
+		make TEST="$$prog" test >/dev/null 2>&1; status=$$?; \
+		if [ $$status -eq 0 ]; \
+		then printf "%-10s\t\033[1;32mpass\033[00;m\n" $$prog; \
+		else printf "%-10s\t\033[1;31mfail\033[00;m\n" $$prog; \
+		fi; \
+	done
+
 .PHONY: $(TEMPDIR) all deps test distclean clean busytest install uninstall