Add tests for schedule stuff

app/helpers.php

@@ -45,3 +45,17 @@ if (! function_exists('human_readable')) {
         return app('file')->humanReadableSize($path, $precision);
     }
 }
+
+if (! function_exists('is_digit')) {
+    /**
+     * Deal with normal (and irritating) PHP behavior to determine if
+     * a value is a non-float positive integer.
+     *
+     * @param mixed $value
+     * @return bool
+     */
+    function is_digit($value)
+    {
+        return is_bool($value) ? false : ctype_digit(strval($value));
+    }
+}