Running grunt task multiple times until it fails

问题

What is the canonical way to run the same grunt task continuously, multiple times until it fails?

I'd like to keep the question generic, but here is a specific use case:

We have a huge set of end-to-end tests written in Protractor which we run via grunt with the help of grunt-protractor-runner and grunt-contrib-connect. What we'd like to do is to keep the connect task running (the web-server serving from a dist directory) while looping over the protractor until it fails (or/and up to N times). The tasks:

connect: {
    test: {
        options: {
            base: 'dist',
            port: 9001
        }
    },
},

protractor: {
    options: {
        keepAlive: true,
        noColor: false
    },
    local: {
        options: {
            configFile: "test/e2e/config/local.conf.js"
        }
    }
},

grunt.registerTask('e2e:local', [
    'connect:test',
    'protractor:local'
]);

Here, we'd like to execute connect:test once and protractor:local multiple times.

回答1:

Turns out to be as simple as adding the same task to the array of tasks N times (still not sure if we can somehow avoid specifying the N and run the task indefinitely until it fails) and, since, by default grunt works in the "fail-fast" mode, the whole task would fail on the first fail. In our case:

grunt.registerTask('e2e:local', function () {
    var tasks = ['connect:test'];

    var N = 100;
    for (var i = 0; i < N; i++) {
        tasks.push('protractor:local')
    }

    grunt.task.run(tasks);
});

N here is hardcoded inside the task, but could be passed "from outside" as a grunt option.

来源：https://stackoverflow.com/questions/36960934/running-grunt-task-multiple-times-until-it-fails

标签

javascript

gruntjs

protractor