hoge.php

<?php

echo "hoge";

hoge_test.go

package main

import "testing"

func TestHoge(t *testing.T) {
	a := 1 + 1
	if a != 2 {
		t.Fatalf("1 + 1 != 2 !?")
	}
}

Makefile

test/watch:
	reflex -r '\.go$$' -- go test {}

test/watch/config:
	reflex -c reflex.conf

test/watch/config/fancy:
	reflex -c reflex.conf -d fancy