json-logic-js/gulpfile.js

var gulp = require("gulp");
var exec = require("child_process").exec;

gulp.task("test", function(cb) {
  exec(
    "node testrunner.js",
    {cwd: "tests"},
    function(err, stdout, stderr) {
      console.log(stdout);
      console.log(stderr);
      cb(err);
    }
  );
});

gulp.task("default", function() {
  gulp.watch(["**/*.js", "tests/tests.json"], ["test"]);
});